L50

· Check the power connection.

· Try with another AC15V power adapter.

· 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.

· 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.

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· 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.

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· 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.

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· 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.

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· 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.

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· 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.

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· For firmware upgrade only.