E50

· Check the power connection.

· Try with another DC5V power adapter.

· Try with another power cable.

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· 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.

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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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· 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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· 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.

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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 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.

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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 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.

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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 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.

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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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· 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.

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· 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.

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· Supply voltage abnormal. Please check the power supply.

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· Supply voltage abnormal. Please check the power supply.

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· Supply voltage abnormal. Please check the power supply.

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· 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.

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· 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.

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· 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.