DX5 MQA / DX5 Lite

· 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.

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· 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.

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· 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.

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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.

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· 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.

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· 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.

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· 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.

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· 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.

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· 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.

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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.

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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.

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· 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.

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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.

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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.

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

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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.