FAQ

Can't be turned on

· Check the power connection.

· Try with another DC15V power adapter.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Use the toggle on rear panel to switch input channel.

· Check the connections for all devices.

· Insertconnectioncablesallthewayin.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· Checktoseeiftheproblemiswiththesource,downstreamequipmentandcables.

‍

One channel with noise/no output

· Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Channel imbalance

· Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

H/M/L blinks, others are off

· Firmware abnormal. Please try to re-flash the firmware.

‍

HML and H/L blinks alternately

· Supply voltage too high/too low. Please use TOPPING’s power adapter.

‍

HML and M blinks alternately

· PN voltage abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Only blinks the current gain LED

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

The usage of the USB port

· For firmware upgrade only.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the  button on front panel to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· Try to switch to "LIFT" on rear panel.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

PN Voltage ERR / P Voltage ERR

Negative and positive voltage abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

HP DC abnormal

Amplifier circuit outputs abnormal DC voltage.

After changing the song or turning down the volume, Unplug and re-plug the power cable and reboot the unit.

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Firmware Error

Please re-flash the correct firmware.

‍

Topping other firmware

Please re-flash the correct firmware.

‍

Unknown file

Please re-flash the correct firmware.

‍

No firmware

Unplug and re-plug the power cable, and then flash the firmware again. Be careful not to disconnect from the computer while flashing the firmware.

‍

Update failed

Please re-flash the firmware.

‍

File size large

Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

Firmware damage

Please re-flash the correct firmware.

‍

The usage of the USB port

For firmware upgrade only.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

The volume too low

· Press the B button on the remote to switch to volume curve 1.

· Turn up the volume of the source.

· Set the headphone gain to high gain by the GAIN button on remote.

· Turn up the volume of the downstream devices if you are using the Line out output of the unit.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the knob to switch input channel.

· Check the output setting. Doule-press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· Try to switch to "LIFT" on rear panel.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

-2/-3/-4

· Negative and positive voltage abnormal. Please update the firmware first.

· May be caused by high temperature. Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place the unit in a place having good ventilation.

· Probably overloaded. Try turning down the volume and then reboot the unit.

· Too low load impedance or short-circuit load. Check the connections with the speaker.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

-5

· Amplifier circuit outputs abnormal DC voltage.

· Turn down the volume of this unit, turn it off and let it cool down for 1 minute before restarting it.

· Disconnect other devices, turn this unit off and cool it down for 1 minute and then restart it. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

-7

· Please re-flash the correct firmware.

‍

LARGE.TXT

· Please re-flash the correct firmware. Reboot the computer or try with another computer.

‍

ERRFW.TXT

· Please re-flash the correct firmware.

‍

UNKOWN.TXT

· Please re-flash the correct firmware.

‍

FAILED.TXT

· Firmware upgrade failed. Please re-flash the firmware.

‍

Can't be turned on

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

· Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected in the rear panel.

‍

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices.

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· Probably overloaded. Try turning down the volume of the source or turning down the gain on the B100.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

Fault code

The indicator blinks A times, after an interval of 1 second, it blinks B times, and after 2 seconds, it blinks again in a cycle. Please determine the A and B values based on the B100 flashing light and find the appropriate treatment below.

‍

A = 2, B = 2 or A = 2, B = 3

Firmware is abnormal. Unplug the power cable and plug in the USB-C to the FW port on the rear panel to re-upgrade.

‍

A = 1, B = 1 or A = 1, B = 2

Negative and positive voltage abnormal

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is   defective.

· Check the power connection.

· If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

A = 1，B = 3

Amplifier circuit outputs abnormal DC voltage

· After changing the song, turning down the source volume and turning down the gain of the unit, unplug and re-plug the power cable and reboot the unit.

· If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

A = 1，B = 4

The protection circuit has been activated due to a rise in temperature within this unit. Reboot B100 after the unit cools down. Please put the unit in a place having good ventilation.

‍

A = 1，B = 5

Too low load impedance or short-circuit load

· Check if the output is short-circuited, the load impedance is too low or the load is short-circuited.

· After changing the song, turning down the source volume and turning down the gain of the unit, unplug and re-plug the power cable and reboot the unit.

· Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal   enclosure.)

· Check if you have followed the connections as per our instructions in user manual.

· Check if the speaker cables are defective, try with other cables.

· Check if the speakers are defective.

· If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

The usage of the USB port

For firmware upgrade only.

Can't be turned on

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is   defective.

· Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected in the front panel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· heck the volume of all device.

‍

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· robably overloaded. Try turning down the volume.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One B200 with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right B200 connections.

‍

Output imbalance

· Check the gain of each B200.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right B200 connections.

‍

IN3 LED: 2 Blinks, Pause 1s (Repeat)

· Incorrect firmware version. Please re-flash the correct firmware.

‍

IN3 LED: 3 or 4 Blinks, Pause 1s (Repeat)

· Firmware upgrade failed. Please re-flash the firmware.

‍

IN1/IN2 LED: Blinks 1 time a second

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the   problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

IN1/IN2 LED: Blinks 1 time a second

· Negative and positive voltage abnormal

· Probably overloaded. Try turning down the volume and then reboot the unit.

· Too low load impedance or short-circuit load

 a  Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal       enclosure.)

 b  Check if you have followed the connections as per our instructions in user manual.

 c  heck if the speaker cables are defective, try with other cables.

 d  Check if the speakers are defective.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

IN2 LED is on and IN1/IN3 LED blinks 1 time a second.

· The protection circuit has been activated due to a rise in temperature within this unit. Unplug the power supply and reboot B200 after the unit cools down. Please put the unit in a place having good ventilation.

‍

VERxx.TXT

· Show the current firmware version.

‍

ERRFW.TXT

· Error firmware. Please re-flash the correct firmware.

‍

LARGE.TXT

· Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

UNKOWN.TXT

· The file does not end with ".Topping". Please re-flash the correct firmware.

‍

FAILED.TXT

· Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

Indicator description

CHG

  · Red: Low battery

  · Green: Enough power

BT

  · Flashing blue: No device connected

  · Steady blue: Bluetooth connected

‍

Volume control‍

 · BC3 has a 32-step volume adjustment which independently from your mobile phone’s control. Press the corresponding touch button to turn the volume up and down. (Uncontrollable volume during Optical output)

‍

Can't be turned on‍

 · The unit need to be charge.

 · Unlock the touch buttons by the touch lock switch on the rear panel.

 · If still can't be turned on, your unit may be defective. Please contact the store where you purchased it.

‍

Optical no output or sound breaks up‍

 · Insert the 3.5 optical converter all the way in.

 · Check the connections for all devices. And check if using the correct connectors.

 · Check if the downstream device supports the sample rate of the currently playing song.

‍

Cannot pair the Bluetooth‍

 · Enter the pairing mode by pressing and holding the "▶||" and "+" buttons at the same time.

 · Bring the Bluetooth device near to this unit.

 · Charge the unit and reboot it.

‍

Bluetooth in: the sound is cut off‍

 · Bring the Bluetooth device near to this unit.

 · Remove obstructions between the Bluetooth device and this unit.

 · To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

 · Reconnect the Bluetooth device.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button shown in the figure to switch the input channel.

· Check the output setting. Press the button shown in the figure to switch the output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Try to enable the PEQ function. [Setup menu - PEQ config - PEQ]

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume and music player volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to C (Balance) in [Setup Menu - Advance - Channel balance].

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair Bluetooth

· Enable Bluetooth function in the setup menu first. [Setup Menu - Advance - Bluetooth]

· May be already connected to another Bluetooth device. Press and hold the headphone button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Disconnect all Bluetooth devices connected to your phone, restart your phone's Bluetooth, and then reconnect the Bluetooth.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Check if the USB setting is correct. [Setup Menu - Advance - USB]

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first. [Setup Menu - Advance - Remote]

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote. If it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

Can't adjust this unit's volume

Please check if DAC mode was set in [Setup Menu - Advance - DAC]. In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

DIR abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

PN8V abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

5V voltage abnormal / low / high

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

FFT module abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

File size large

Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

Firmware damage

Please re-flash the correct firmware.

‍

Topping other firmware

Please re-flash the correct firmware.

‍

Unknown file

Please re-flash the correct firmware.

‍

Update failed

Please re-flash the firmware.

‍

No firmware

Please re-flash the firmware.

Insufficient power supply‍

 · Problems that may occur: 1. Abnormal sound  2. Can't be recognized  3. Can be recognized but no output  4. SPDIF output but no RCA output  5. Noise on one channel

 · If it is connected to mobile phone, it is caused by insufficient output current from the mobile phone, so it is recommended to connect it to a computer for use.

 · If it is connected to a computer, please try to use the USB port on the computer's host and use a USB cable within 1.5m, or even try a different USB cable.

‍

The connected USB device does not recognize this unit‍

 · USB cable did not connected properly. Please check or change the cable.

 · Try with another USB port.

 · Driver problem. Try to reinstall the driver.

 · May be caused by the PC. Check or try with another PC.

‍

Noisy playback‍

 · Try with other songs.

 · The specifications of songs are not supported by this unit.

 · If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

 · Check to see if the problem is with the source, downstream equipment and cables.

 · If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output‍

 · Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance‍

 · Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

The sample rate displayed on the device does not match the music file‍

 · The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

 · The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

 · If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

 · Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

 · We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

No output on optical and coaxial during DSD playback‍

 · Check if the optical/coaxial input of the downstream device supports DSD.

 · Check that the song being played is within the supported range of this unit.

‍

Filtering mode‍

 · Minimum Phase fast roll-off

Insufficient power supply

Problems that may occur:    

       1. Abnormal sound

       2. Can't be recognized  

       3. Can be recognized but no output

       4. SPDIF output but no RCA output

       5. Noise on one channel

· If it is connected to mobile phone, it is caused by insufficient output current from the mobile phone, so it is recommended to connect it to a computer for use.

· If it is connected to a computer, please try to use the USB port on the computer's host and use a USB cable within 1.5m, or even try a different USB cable.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

No output on optical and coaxial during DSD playback

· Check if the optical/coaxial input of the downstream device supports DSD.

· Check that the song being played is within the supported range of this unit.

‍

Filtering mode

· Fast roll off apodizing

Can't be turned on

· Connect DC5V power supply to the POWER port.

· Try with another DC5V power adapter.

· Try with another power cable.

‍

No sound

· The device did not power on. Check the power supply and press the button on the front panel to turn the unit on.

· Check that the proper input source is selected.Toggle rocker left or right to switch input channel.

· Check the output setting. Press the Line out button on the remote to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* Bluethooth IN: Too low volume on phone. Please adjust volume.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume and music player volume. 2) Select the default output device of your music player or computer as this unit.

‍

‍

Abnormal sound (USB IN)

· Check  if the PEQ function is ON. [Setup menu - 9.PEQ]

· Check to see if the problem is with the source, downstream equipment and cables.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on the remote control to let this unit enter pairing mode.

· ring the Bluetooth device near to this unit.

· 重Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· o prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· SB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

How to pair the Bluetooth remote

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Bring the remote control close to the device and install the Bluetooth antenna.

· Try to pair the Bluetooth of the mobile phone and the remote control, if it can be paired and press the up/down button can work, the remote is fine. Otherwise, the remote is faulty.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

DAC ERR L / DAC ERR R / DAC ERR L+R

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

DIR ERR

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

DCIN ERR / DCIN HIGH / DCIN LOW

· Power supply abnormal/too high/too low

· Connect DC5V power supply to the POWER port.

· Try with another DC5V power adapter.

‍

PN ERR / PNH ERR / PNL ERR

· Negative and positive voltage abnormal

· Connect DC5V power supply to the POWER port.

· Try with another DC5V power adapter.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

UPDATE FAIL /  READ FAIL / FIRMWARE FAIL

· Please try ro re-flash the firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing and holding the left button of front panel while powering up the unit. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU MODE

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

Can't be turned on

· Connect DC5V power supply to the POWER port.

· Try with another DC5V power adapter.

· Try with another power cable.

‍

No sound

· The device did not power on. Check the power supply and press the button on the front panel to turn the unit on.

· Check that the proper input source is selected.Toggle rocker left or right to switch input channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN:

（1）Too low volume on PC. Please check and adjust the computer system volume and music player volume.

（2）Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· May be already connected to another Bluetooth device. Please turn off other device's Bluetooth. Or uninstall the Bluetooth antenna, with the phone close to the device, and install the Bluetooth antenna after pairing is complete.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

DAC L Err / DAC R Err

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

protect

· Power supply abnormal. Please use DC5V power supply.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the  button on front panel to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* Bluethooth IN: Too low volume on phone. Please adjust volume.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise / no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to C (Balance) in [Setup Menu - Advance - Channel balance].

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first.

· May be already connected to another Bluetooth device. Press and hold headphone button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

Please check if DAC mode was set in [Setup menu-Advanced-DAC mode]. In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

DAC abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

DIR abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

PN voltage abnormal / low / high

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

5V voltage abnormal / low / high

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

FFT module abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

File size large

Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

Firmware damage

Please re-flash the correct firmware.

‍

Topping other firmware

Please re-flash the correct firmware.

‍

Unknown file

Please re-flash the correct firmware.

‍

Update failed

Please re-flash the firmware.

‍

No firmware

Please re-flash the firmware.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button on front panel to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* Bluethooth IN: Too low volume on phone. Please adjust volume.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to C (Balance) in [Setup Menu - Advance - Channel balance].

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first.

· May be already connected to another Bluetooth device. Press and hold headphone button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check if DAC mode was set in [Setup menu-Advanced-DAC mode]. In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

DAC abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

DIR abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

PN voltage abnormal/ low /high

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

5V voltage abnormal/ low /high

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

FFT module abnormal

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

File size large

Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

Firmware damage

Please re-flash the correct firmware.

‍

Topping other firmware

Please re-flash the correct firmware.

‍

Unknown file

Please re-flash the correct firmware.

‍

Update failed

Please re-flash the firmware.

‍

No firmware

Please re-flash the firmware.

Can't be turned on

· Check the power connection.

· Check the voltage setting on side panel.

· Check if the rear panel power switch is in the ON position.

· If the fuse is blown, try using the spare fuse.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the SEL button on the front panel to switch input channel.

· Check the output setting. Press the blank button on remote to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: （1） Too low volume on PC. Please check and adjust the computer system volume and music player volume. （2） Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA

· Note that only USB input of this unit support MQA.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

Incorrect FW ver

· Incorrect firmware. Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the volume up and volume down buttons on the front panel at the same time. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU MODE

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button on the left side of the front panel to switch input channel.

· Check the output setting. Press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume and music player volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to "Balance C" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device and install the Bluetooth antenna.

· Try to pair the Bluetooth of the mobile phone and the remote control, if it can be paired and press the up/down button can work, the remote is fine. Otherwise, the remote is faulty.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

MCU no FW

Please try to re-flash the correct firmware.

If the computer does not recognize the unit, try entering DFU mode by pressing and holding the knob while powering up the unit. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU mode

If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

upgrade failed/FW reads fail

‍

upgrade failed/FW reads fail

Please try to re-flash the firmware.

‍

DAC ERROR

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Protect

Supply voltage abnormal. Please check the power supply.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button on the left side of the front panel to switch input channel.

· Check the output setting. Press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN

   (1）Too low volume on PC. Please check and adjust the computer system volume and music player volume.

   (2）Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to "Balance C" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

How to pair the Bluetooth remote

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device and install the Bluetooth antenna.

· Try to pair the Bluetooth of the mobile phone and the remote control, if it can be paired and press the up/down button can work, the remote is fine. Otherwise, the remote is faulty.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA

· Note that only USB, optical, coaxial and AES inputs of this unit support MQA.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

MCU no FW

· Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing and holding the knob while powering up the unit. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU mode

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

upgrade failed/FW reads fail

· Please try ro re-flash the firmware.

‍

DAC ERROR

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

‍

Protect

· Supply voltage abnormal. Please check the power supply.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· If the fuse is blown, try using the spare fuse.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button on the left side of the front panel to switch input channel.

· Check the output setting. Press the blank button on remote to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: （1） Too low volume on PC. Please check and adjust the computer system volume and music player volume. （2）Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to "Balance C" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA

· Note that only USB, optical and coaxial inputs of this unit support MQA.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

Incorrect FW ver

· Incorrect firmware. Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the volume up and volume down buttons on the front panel at the same time. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU MODE

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

upgrade failed/FW reads fail/MCU no FW

· Please try ro re-flash the firmware.

‍

‍

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· If the fuse is blown, try using the spare fuse.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button on the left side of the front panel to switch input channel.

· Check the output setting. Press the blank button on remote to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: （1） Too low volume on PC. Please check and adjust the computer system volume and music player volume. （2）Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to "Balance C" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA

· Note that only USB, optical and coaxial inputs of this unit support MQA.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

Incorrect FW ver

· Incorrect firmware. Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the volume up and volume down buttons on the front panel at the same time. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU MODE

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

upgrade failed/FW reads fail/MCU no FW

· Please try ro re-flash the firmware.

Not mutichannel output

· Please check that the audio file you are playing is multichannel, not stereo.

· Please check if the player you use supports multichannel processing or exclusive mode.

· Check if the settings of the player are correct.

‍

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted. For the PC, please check and adjust the computer system volume, music player volume and driver volume, and please select the default output device of your music player or computer as this unit.

· Try with another song and another music player.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables.

‍

Channel imbalance

· Check the channel balance setting.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

DFU MODE

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

upgrade failed/FW reads fail/MCU no FW

· Please try ro re-flash the firmware.

‍

PROTECT

· Internal circuit protection triggered. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

DAC ERR

· DAC abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

‍Can this unit connect to the RCA device?

· No recommended.

‍

‍How to adjust the channel balance

· By the channel balance setting on the unit.

‍

‍Can't be turned on. The light is off.

· Check the power connection.

· Try with another DC5V power adapter.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume.

· Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Channel imbalance

Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

The volume is not adjustable

The knob is used to adjust the volume of headphone output. the volume of Line out is not adjustable and is the maximum value.

‍

Filtering mode

Fast roll off linear

Can't be turned on

· Check the power connection.

· Try with another DC15V power adapter.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the knob on front panel to switch input channel.

· Check the output setting. Doule-press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first.

· May be already connected to another Bluetooth device. Press and hold brightness button in the lower right corner on the remote to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

HP -3

· Incorrect firmware version. Please re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the headphone button on the remote control 5 times while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

HP ERR

· Amplifier circuit may output abnormal DC voltage.

· Please flash the latest firmware first.

· If use the RCA output, please switch the output mode to Line out by doule-pressing the knob.

· After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

IN Err / INH Err / INL Err

· Supply voltage too high/too low. Please use TOPPING’s power adapter.

‍

d-3

· DAC abnormal. Try using another DC15V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Can't adjust this unit's volume

· Please check whether it is set to DAC mode in the setup menu.

· In PRE (Pre-amplifier) mode, the this unit will always display the volume level. When the sampling rate of the input signal changes, it will display the sampling rate for 2 seconds and then continue displaying the volume level; In DAC mode, it will always display the sampling rate, keep the maximum volume output and the volume is not adjustable.

‍

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the knob to switch input channel.

· Check the output setting. Doule-press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* Bluethooth IN: Too low volume on phone. Please adjust volume.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume and music player volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to "Balance C" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

Please check if DAC mode was set in setup menu (LO Mode | DAC). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA (DX5 MQA only)

· Note that only USB, optical and coaxial inputs of this unit support MQA.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

Incorrect FW Ver

Incorrect firmware. Please try to re-flash the correct firmware.

If the computer does not recognize the unit, try entering DFU mode by pressing the knob for 5s while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU

If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

upgrade failed

Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

‍

HP protec

Amplifier circuit outputs abnormal DC voltage.

After changing the song or turning down the volume, Unplug and re-plug the power cable and reboot the unit.

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the knob on front panel to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: （1）Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. （2）Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to "Balance C" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first. (BT | ON)

· May be already connected to another Bluetooth device. Press and hold headphone button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first. (IR Receive | ON)

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

Incorrect FW Ver

· Incorrect firmware. Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the knob for 5s while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU MODE

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

HP protec

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the

‍

DAC ERROR

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· If the fuse is blown, try using the spare fuse.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the knob on front panel to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Set to C (Balance) in [Setup Menu - Advance - Channel balance].

· Topping control panel→Volume→Output→Set all to 0dB

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first. [Setup Menu - Advance - Bluetooth]

· May be already connected to another Bluetooth device. Press and hold headphone button on the remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Check if the USB setting is correct. [Setup Menu - Advance - USB]

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first. [Setup Menu - Advance - Remote]

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

DAC abnormal

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

DIR abnormal

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

HP  BAL  L/R abnormal

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

HP  SE abnormal

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

FFT module abnormal

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

File size large

· Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

Firmware damage

· Please re-flash the correct firmware.

‍

Topping other firmware

· Please re-flash the correct firmware.

‍

Unknown file

· Please re-flash the correct firmware.

Update failed

· Please re-flash the firmware.

‍

No firmware

· Please re-flash the firmware.

‍

Can't be turned on

· Check the power connection.

· Try with another DC5V power adapter.

· Try with another power cable.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the touch button on front panel to switch input channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume, music player volume and driver volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

Please check whether it is set to DAC mode in the setup menu.

In PRE (Pre-amplifier) mode, the this unit will always display the volume level. When the sampling rate of the input signal changes, it will display the sampling rate for 2 seconds and then continue displaying the volume level; In DAC mode, it will always display the sampling rate, keep the maximum volume output and the volume is not adjustable.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

Auto -3

Incorrect firmware. Please try to re-flash the correct firmware.

If the computer does not recognize the unit, try entering DFU mode by pressing the headphone button on the remote control 5 times while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU

If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

d-3

DAC abnormal

Please flash the latest firmware first.

Try using another DC5V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

INH Err

Supply voltage too high. Please use DC5V power supply.

‍

INL Err

Supply voltage too low. Please use DC5V power supply.

‍

PN Err

Negative and positive voltage abnormal. Try using another DC5V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

Can't be turned on

· Check the power connection.

· Try with another DC5V power adapter.

· Try with another power cable.

‍

No sound

· The device did not power on. Check the power supply.

· heck that the proper input source is selected. Press the touch button on front panel to switch input channel.

· Check the output setting.  Press the "Line out" button on the remote control or double press the touch button on the front panel to switch the output channel. "O-1" indicates only RCA output; "O-2" indicates only TRS output; "O-3" indicates that RCA andTRS are output at the same time.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume and music player volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port. Do not use the USB hub.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

· Please check whether it is set to DAC mode in the setup menu.

· In PRE (Pre-amplifier) mode, the this unit will always display the volume level. When the sampling rate of the input signal changes, it will display the sampling rate for 2 seconds and then continue displaying the volume level; In DAC mode, it will always display the sampling rate, keep the maximum volume output and the volume is not adjustable.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA

· Note that optical and coaxial inputs of this unit only support MQA renderer, not full MQA. So the MQA stream needs to be decoded by software and then transmitted to the E50's optical/coaxial inputs.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

OFS -3

· Incorrect firmware. Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the headphone button on the remote control 5 times while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

d-3

· DAC abnormal. Try using another DC5V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

dIr Err

· DIR abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

IN Err

· Supply voltage abnormal. Please check the power supply.

‍

INH Err

· Supply voltage abnormal. Please check the power supply.

‍

INL Err

· Supply voltage abnormal. Please check the power supply.

‍

PN Err

· Negative and positive voltage abnormal. Try using another DC5V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

PNH Err

· Negative and positive voltage abnormal. Try using another DC5V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

PNL Err

· Negative and positive voltage abnormal. Try using another DC5V power supply. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the touch button to switch input channel.

· Check the output setting. Press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* Bluethooth IN: Too low volume on phone. Please adjust volume.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Topping control panel→Volume→Output→Set all to 0dB.

· Set to "CB 0.0dB" in setup menu.

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first (r-O).

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

Can't adjust this unit's volume

Please check if DAC mode was set in setup menu (m-d). In DAC mode, the volume is not adjustable and is the maximum value, while in PRE mode the volume can be adjusted. Set it to PRE mode if you need to adjust the volume.

‍

The sample rate displayed on the device does not match the music file

The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

CB-3/-4

Incorrect firmware. Please try to re-flash the correct firmware.

If the computer does not recognize the unit, try entering DFU mode by pressing the knob for 5s while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

CB -1

Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

‍

dAc Err

DAC abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

dIr Err

DIR abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

IN Err / INH Err / INL Err

Supply voltage abnormal. Please check the power supply.

‍

PN Err / PNH Err / PNL Err

Negative and positive voltage abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍Can't be turned on

· Check the power connection.

· Try with another DC15V/2A power adapter.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Channel imbalance

Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

LED 2 Blinks, Pause 1s (Repeat)

Incorrect firmware version. Unplug and re-plug the power cable, and then flash the correct firmware.

‍

LED 3 Blinks / 4 Blinks, Pause 1s (Repeat)

Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

‍

LED blinks 1 time a second

Headphone output abnormal. After changing the song or turning down the volume, Unplug and re-plug the power cable and reboot the EHA5.

‍

LED 3 Blinks, Pause 2s (Repeat)

Negative and positive voltage abnormal. Check the power adapter. Do not connect the EHA5 to any other devices and headphones, then reboot.

‍

LED 2 Blinks, Pause 2s (Repeat)

Bias voltage abnormal. Disconnect the headphone, unplug and re-plug the power cable and reboot the EHA5. Check the headphone or try another headphone.

Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the knob to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· Bluethooth IN: Too low volume on phone. Please adjust volume.

· USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume and music player volume. 2) Select the default output device of your music player or computer as this unit.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

· If the noise disappears after unplugging the USB cable, it may be interference from the source. You could try to add a USB isolation between this unit and the source.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections and try with another source.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first (BT | ON).

· May be already connected to another Bluetooth device. Press and hold the brightness button on remote control to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port. Do not use the USB hub.

· river problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Try to insert two fresh AAA batteries.

· lease aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

The sample rate displayed on the device does not match the music file

· The choice of music player app, the setting of music player and the setting of computer/phone will all have an impact on the sampling rate.

· The sampling rate displayed by this unit is the sampling rate of the input signal, and it will not change the sampling rate by itself.

· If the music player can be set to exclusive mode, the audio signal will not be resampled by the computer/phone, so the sampling rate of the output signal is the sampling rate of the original file, and the sampling rate displayed by this unit is also the sampling rate of the original file.

· Because some players can't be set to exclusive mode, the audio signal will be resampled by the computer/phone and then output. So this unit will always display the sampling rate set by the computer/phone.

· We recommend using Audirvana player on MAC OS and Foobar on windows OS.

‍

The unit doesn't display MQA while playing MQA

· Note that only USB input of this unit support MQA.

· Check if settings of the music player is correct.

· Check if an MQA file is being played or if the player is processing MQA signals and sending non-MQA signals to the DAC.

· Check and adjust the volume of music player to the maximum.

· Turn off EQ.

‍

-5

· Incorrect firmware. Please try to re-flash the correct firmware.

· If the computer does not recognize the unit, try entering DFU mode by pressing the knob for 5s while the unit is in standby mode. If this does not work, try using another USB port, another USB cable or even another computer.

‍

DFU

· If you accidentally enter DFU mode, unplug and re-plug the power cable and reboot this unit. Try to re-flash the firmware if DFU is still displayed.

‍

Er.1

· Supply voltage abnormal. Please check the power supply.

‍

Er.2

· PN voltage abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Er.3

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Er.4

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

Power light off

· G5 need to be charge.

‍

AUX in input, no sound

· Input and output are reversed. Connect to correct port.

· Signal cable did not connected properly. Check or change the cable.

· The player did not output. Check the player.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

USB input, no sound

· Too low volume on PC. Please Adjust volume.

· G5 is not selected as the output device on the PC. Please set the G5 as the default output device.

‍

Cannot pair G5 Bluetooth

· G5 does not switch to Bluetooth input. Please switch to Bluetooth input.

· G5 is already connected to other Bluetooth device. Let G5 enter pairing mode first. Switch Gain L→M→L→M→L→M within 3 seconds, status indicator flashes to mean G5 has entered pairing mode.

‍

Bluetooth input, no sound

· Too low volume on phone. Please adjust volume.

‍

Noisy playback

· Try with other songs.

· The specifications of songs are not supported by this unit.

· If the noise appears only when playing DSD files, please check and adjust the computer system volume and music player volume to the maximum.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

· Check to see if the problem is with the source, headphone and cables.

‍

Channel imbalance

· Check to see if the problem is with the source, headphone and cables.

‍

Power indicator/Status indicator(Note that when switching to AUX input, the status indicator goes out.)

Power indicator                                          Status indicator

OFF                                                       OFF                                                         G5 need to be charge.

Steady yellow                                       ---                                                          Charging

Steady green                                        ---                                                          Enough power or fully charged

Steady red                                            ---                                                          Low battery

---                                                        Flashing blue                                          Input not connected

---                                                        Steady blue                                            Input connected

---                                                        Steady blue                                            Playing PCM

---                                                         Steady red                                             Playing DSD

Steady yellow                                      Flashing blue                                         Upgrading firmware

Steady yellow                                      Flashing blue                                         Upgrading firmware

Steady yellow                                      Red light blinks once a second            Firmware upgrade failed. Unplug and re-plug the USB cable, and then flash the firmware again.

Steady yellow                                      Red light blinks twice a second            Incorrect firmware version. Please re-flash the correct firmware.

Steady yellow                                      Flashing red                                            No firmware. Unplug and re-plug the USB cable, and then flash the firmware again.

Steady yellow                                      Flashing red                                            Please re-flash the firmware.

Steady yellow                                      Steady magenta                                     G5 is in DFU mode now. If you accidentally enter DFU mode, reboot this unit. Try to re-flash

                                                                                                                              the firmware if DFU is still displayed.

RED LED 2 Blinks, Pause 2s (Repeat) ---                                                            Negative and positive voltage abnormal. Disconnect other devices and reboot. If the problem                                                                                                                                still persists, your unit may be defective. Please contact the store where you purchased it.

RED LED 3 Blinks, Pause 2s (Repeat)---                                                             Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the                                                                                                                                 volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists                                                                                                                                 after disconnecting the other devices and restarting it, the unit may be defective. Please                                                                                                                                 contact the store where you purchased it.

---                                                        Flashing red                                               DAC abnormal. Disconnect other devices and reboot. If the problem still persists, your unit                                                                                                                                  may be defective. Please contact the store where you purchased it.

The computer can't recognize the USB device after connecting HS01

· Audio cable was connected improperly. Please Check and reconnect. Try both to connect the USB device to the HS01 before connecting it to the computer, and the other way.

· USB port incompatibility. HS01 is compatible with USB 2.0.

· If the USB device already has built-in USB isolation, HS01 is not required.

· USB cable is faulty. Try to use other USB cables.

· Try with another USB device. If it works perfectly with another USB device, the HS01 is fine.

‍The computer can't recognize the USB device after connecting HS02

· Incorrect input/output setting of HS02. Check the input switch and  the output switch.

· Audio cable was connected improperly. Please Check and reconnect. Try both to connect the USB device to the HS02 before connecting it to the computer, and the other way.

· USB port incompatibility. HS02 is compatible with USB 2.0.

· If the USB device already has built-in USB isolation, HS02 is not required.

· USB cable is faulty. Try to use other USB cables.

‍

‍Output Current

· Related to the input current, the maximum output current will be 0.8A when the input current has 2A.

Can't be turned on

· Check the power connection.

· Try with another AC15V power adapter.

· Try with another power outlet.

‍

LED blinks

· May be abnormal power supply. Check if the power supply is AC15V.

· Amplifier circuit may output abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

No sound

· The device did not power on. Check the power supply.

· Check the output setting on the front panel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· If the noise disappears after disconnecting RCA cables, the noise may be coming from upstream devices or caused by a ground loop.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

‍

One channel with noise/no output

· Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Channel imbalance

· Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

Can't be turned on

· Check the power connection.

· Try with another AC15V power adapter.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected.

· The rear panel outputs are input passthrough when the unit is off and are off when the unit is on.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· If the noise disappears after disconnecting RCA cables, the noise may be coming from upstream devices or caused by a ground loop. You could try the fully balanced connection.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

· Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Channel imbalance

· Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

1/2/3/5 Blinks, Pause 1s (Repeat)

· May be abnormal power supply. Check if the power supply is AC15V.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

4 Blinks, Pause 1s (Repeat)

· May be abnormal power supply. Check if the power supply is AC15V.

· Amplifier circuit may output abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit.

· Try other TRS cables.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

The usage of the USB port

· For firmware upgrade only.

‍Can't be turned on

· Check the power connection.

· Check if the rear panel power switch is in the ON position.

· Try with another power cable.

· Try with another power outlet.

‍

No sound

· The device did not power on. Check the power supply.

· Check that the proper input source is selected. Press the button on front panel to switch input channel.

· Check the output setting.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· Try to switch to "LIFT" on rear panel.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Channel imbalance

Check to see if the problem is with the source, headphone and cables. You can try swapping the left and right channel connections and try with another headphone.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

PN Voltage ERR / P Voltage ERR

Negative and positive voltage abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

HP DC abnormal

Amplifier circuit outputs abnormal DC voltage.

After changing the song or turning down the volume, Unplug and re-plug the power cable and reboot the unit.

Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Firmware Error

Please re-flash the correct firmware.

‍

Topping other firmware

Please re-flash the correct firmware.

‍

Unknown file

Please re-flash the correct firmware.

‍

No firmware

Unplug and re-plug the power cable, and then flash the firmware again. Be careful not to disconnect from the computer while flashing the firmware.

‍

Update failed

Please re-flash the firmware.

‍

File size large

Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

Firmware damage

Please re-flash the correct firmware.

‍

r7

Incorrect firmware. Please try to re-flash the correct firmware.

If the computer does not recognize the unit, try using another USB port, another USB cable or even another computer.

‍

Display ”Err“ for 3s

Firmware upgrade failed. Unplug and re-plug the USB cable, and then flash the firmware again.

‍

r2/r3

Negative and positive voltage abnormal. Please update the firmware first.

· May be caused by high temperature. Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place the unit in a place having good ventilation.

· Probably overloaded. Try turning down the volume and then reboot the unit.

· Too low load impedance or short-circuit load. Check the connections with the speaker.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

r5

Amplifier circuit outputs abnormal DC voltage.

· Turn down the volume of this unit, turn it off and let it cool down for 1 minute before restarting it.

· Disconnect other devices, turn this unit off and cool it down for 1 minute and then restart it. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

The usage of the USB port

For firmware upgrade only.

Can't be turned on

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

· Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected in the front panel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all device.

‍

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· Probably overloaded. Try turning down the volume.

· Check to see if the problem is with the source, downstream equipment and cables.

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

IN3 LED: 2 Blinks, Pause 1s (Repeat)

· Incorrect firmware version. Please re-flash the correct firmware.

‍

IN3 LED: 3 or 4 Blinks, Pause 1s (Repeat)

· Firmware upgrade failed. Please re-flash the firmware.

‍

IN1/IN2 LED: Blinks 1 time a second

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

IN1/IN2 LED: Blinks 1 time a second

Negative and positive voltage abnormal

· Probably overloaded. Try turning down the volume and then reboot the unit.

· Too low load impedance or short-circuit load

    a, Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal enclosure.)

    b, Check if you have followed the connections as per our instructions in user manual.

    c, Check if the speaker cables are defective, try with other cables.

    d, Check if the speakers are defective.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

VERxx.TXT

· Show the current firmware version.

‍

ERRFW.TXT

· Error firmware. Please re-flash the correct firmware.

‍

LARGE.TXT

· Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

UNKOWN.TXT

· The file does not end with ".Topping". Please re-flash the correct firmware.

‍

FAILED.TXT

· Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

‍

Can connect speakers with nominal impedance below 8 ohm in MONO mode?

· Yes, but there will be no increase in output power.

Can't be turned on

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

· Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected in the front panel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all device.

‍

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· Probably overloaded. Try turning down the volume.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

IN3 LED: 2 Blinks, Pause 1s (Repeat)

Incorrect firmware version. Unplug and re-plug the power cable, and then flash the correct firmware.

‍

IN3 LED: 3 or 4 Blinks, Pause 1s (Repeat)

Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

‍

IN1/IN2 LED: Blinks 1 time a second

Abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the LA90D.

‍

IN1/IN2 LED: Blinks 1 time a second

Negative and positive voltage abnormal

· Probably overloaded. Try turning down the volume and then reboot the unit.

· Too low load impedance or short-circuit load

    a, Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal enclosure.)

    b, Check if you have followed the connections as per our instructions in user manual.

    c, Check if the speaker cables are defective, try with other cables.

    d, Check if the speakers are defective.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

IN2 LED is on and IN1/IN3 LED blinks 1 time a second.

The protection circuit has been activated due to a rise in temperature within this unit. Unplug the power supply and reboot LA90 Discrete after the unit cools down. Please put the unit in a place having good ventilation.

‍

VERxx.TXT

Show the current firmware version.

‍

ERRFW.TXT

Error firmware. Please re-flash the correct firmware.

‍

LARGE.TXT

Please re-flash the correct firmware. Try to reboot the computer or use another computer.

‍

UNKOWN.TXT

The file does not end with ".Topping". Please re-flash the correct firmware.

‍

FAILED.TXT

Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

Can't be turned on

·Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

·Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected. Press the knob to switch input channel.

· Check that the proper output channel is selected. Doule-press the knob to switch output channel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

* Bluethooth IN: Too low volume on phone. Please adjust volume.

* USB IN: 1) Too low volume on PC. Please check and adjust the computer system volume, music player volume and driver volume. 2) Select the default output device of your music player or computer as this unit.

‍

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· Probably overloaded. Try turning down the volume.

· May be caused by high temperature. Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place the unit in a place having good ventilation.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Can the amp be used in bridged mode so that it can be used as a mono amp?

The amplifier is already internally bridged. So no you can't short the any of the output terminals together.

‍

Cannot pair the Bluetooth

· Enable Bluetooth function in the setup menu first.

· May be already connected to another Bluetooth device. Press and hold brightness button on the remote control for 3s to let this unit enter pairing mode.

· Bring the Bluetooth device near to this unit.

· Turn the power of the unit off and on again, and then try again.

‍

Bluetooth in: the sound is cut off

· Bring the Bluetooth device near to this unit.

· Remove obstructions between the Bluetooth device and this unit.

· To prevent electromagnetic interference, locate this unit away from microwave ovens, wireless LAN devices and other Bluetooth devices.

· Reconnect the Bluetooth device.

‍

The connected USB device does not recognize this unit

· USB cable did not connected properly. Please check or change the cable.

· Try with another USB port.

· Driver problem. Try to reinstall the driver.

· May be caused by the PC. Check or try with another PC.

· Some phones require OTG function to be enabled first.

‍

Remote control not responding

· Enable remote control function in the setup menu first.

· Try to insert two fresh AAA batteries.

· Please aim at the remote control receiver.

· Bring the remote control close to the device.

· Use your Android phone's camera to look at the transmitter at the top of the remote, if it doesn't blink when you press the remote button, the remote is defective.

· If you have more than one Topping device, check that you are using the correct remote control.

‍

GAIN -1 / GAIN -2

Firmware upgrade failed. Unplug and re-plug the power cable, and then flash the firmware again.

‍

GAIN -3

Incorrect firmware version. Unplug and re-plug the power cable, and then reflash the correct firmware.

‍

P-U / P-d

Supply voltage too high/too low. Please use TOPPING’s power adapter.

‍

r-d / r-r / r-A / P-0

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

· Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

r-H

Abnormal DC voltage. After changing the song or turning down the volume/gain, unplug and re-plug the power cable and reboot the MX3s.

‍

Frequency of the Subwoofer Output

It is full-band.

‍

Power light off

· The unit need to be charge.

‍

No sound

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

‍

Noisy playback

· Try with other songs.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

· Check to see if the problem is with the source, headphone and cables.

‍

Channel imbalance

· Check to see if the problem is with the source, headphone and cables.

‍

Indicator description

Battery indication

               · Steady green  -Enough power

               · Flashing green  -Low battery

Charge indication

               · Power off: Flashing red  -Charging

               · Power off: Steady red  -Fully charged

               · Power on: Steady green&Flashing red  -Charging

               · Power on: Steady green&Steady red  -Fully charged

‍

Red and green light: 1 Blink, Pause 1s (Repeat)

· Supply voltage too high. Please use DC5V power supply.

‍

Red and green light: 2 Blinks, Pause 1s (Repeat)

· Negative and positive voltage abnormal. Disconnect other devices and reboot. If the problem still persists, your unit may be defective. Please contact the store where you purchased it.

‍

Red and green light: 3 Blinks, Pause 1s (Repeat)

· Amplifier circuit outputs abnormal DC voltage. After changing the song or turning down the volume, unplug and re-plug the power cable and reboot the unit. If the problem still persists after disconnecting the other devices and restarting it, the unit may be defective. Please contact the store where you purchased it.

‍

The usage of the USB port

· For firmware upgrade only.

‍

Can't be turned on‍

 · Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

 · Check the power connection.

‍

No sound‍

 · The device did not power on. Check LED and the power connection.

 · Check that the proper input source is selected. Press the left button on front panel to switch input channel.

 · Check the connections for all devices.

 · Insert connection cables all the way in.

 · Check the volume of all devices and whether they are muted.

 · May be caused by high temperature. Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place the unit in a place having good ventilation.

‍

Abnormal sound‍

 · One channel’s positive output and negative output mayb be reversed, please check and correct it.

 · The cables may not be connected correctly, check and reconnect them.

 · Probably overloaded. Try turning down the volume.

 · Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output‍

 · Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance‍

 · Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Sound interrupted and 2 LED flash‍

 · Power voltage too high, PA3s start over voltage protection. Please use TOPPING’s power adapter.

 · PA3s overload then turn to protection mode. Output is closed to protect the speakers. Please turn down the volume and reboot PA3s.

‍

High temperature. BAL LED flashes once and stops for 1s.‍

 · Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place this unit in a place having good ventilation.

‍

BAL LED flashes twice and stops for 1s‍

 · Too low load impedance or short-circuit load

 · Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal enclosure.)

 · Check if you have followed the connections as per our instructions in user manual.

 · Check if the speaker cables are defective, try with other cables.

 · Check if the speakers are defective.

‍

SE LED flashes once/twice/three and stop for 2s‍

 · Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

 · If the power adapter works and the problem still persists after disconnecting the other devices and restarting PA3s, the unit may be defective. Please contact the store where you purchased it.

‍

Can the amp be used in bridged mode so that it can be used as a mono amp?‍

 · The amplifier is already internally bridged. So you can't short the any of the output terminals together.

Can't be turned on

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

· Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected in the front panel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· May be caused by high temperature. Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place the unit in a place having good ventilation.

· Too low load impedance or short-circuit load

    a, Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal enclosure.)

    b, Check if you have followed the connections as per our instructions in user manual.

    c, Check if the speaker cables are defective, try with other cables.

    d, Check if the speakers are defective.

‍

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· Probably overloaded. Try turning down the volume.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

· Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Can the amp be used in bridged mode so that it can be used as a mono amp?‍

· The amplifier is already internally bridged. So no you can't short the any of the output terminals together.

Can't be turned on

· Check the power adapter. Only connect the power adapter to a power outlet, not to the unit. If the LED on the adapter blinks or does not light up, the adapter is defective.

· Check the power connection.

‍

No sound

· The device did not power on. Check LED and the power connection.

· Check that the proper input source is selected in the front panel.

· Check the connections for all devices.

· Insert connection cables all the way in.

· Check the volume of all devices and whether they are muted.

· May be caused by high temperature. Turn the power off, wait for the unit to cool down sufficiently, and then turn the power on again. Please place the unit in a place having good ventilation.

· Too low load impedance or short-circuit load

    a, Check if the speaker cables are connected in place. (Note: when connecting the speaker cables, there can be no bare leakage of copper wire touching the metal enclosure.)

    b, Check if you have followed the connections as per our instructions in user manual.

    c, Check if the speaker cables are defective, try with other cables.

    d, Check if the speakers are defective.

‍

Abnormal sound

· One channel’s positive output and negative output mayb be reversed, please check and correct it.

· The cables may not be connected correctly, check and reconnect them.

· Probably overloaded. Try turning down the volume.

· Check to see if the problem is with the source, downstream equipment and cables.

‍

One channel with noise/no output

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Channel imbalance

Check to see if the problem is with the source, downstream equipment and cables. You can try swapping the left and right channel connections.

‍

Can the amp be used in bridged mode so that it can be used as a mono amp?

The amplifier is already internally bridged. So no you can't short the any of the output terminals together.