Denon Professional DN-280 Guide D'utilisation page 6

Troubleshooting
If you encounter a problem, first try one or more of the following:
•
Make sure all cables and other connected devices are properly and securely connected.
•
Make sure you are using DN-280 as described in this user guide.
•
Make sure your other devices are working properly.
•
If you believe DN-280 is not working properly, check the following table for your problem and
solution.
Problem:
Power does not turn on.
DN-280 does not produce any
sound, or the sound is distorted.
The sound has a hum or noise.
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Solution:
Make sure DN-280's Power Input is properly connected
to a power outlet using the included power cable.
Make sure all cable and device connections are secure
and correct.
Make sure none of the cables are damaged.
Make sure the volume settings on your loudspeaker,
mixer, etc. are correct.
If you are trying to produce sound through the Channel
Input, make sure that no device is plugged into the Aux
Input.
If the Protection (PROT) LED is on, reduce DN-280's
temperature by making sure there is good ventilation,
and/or decreasing the volume.
Check the polarity of the input connections.
If an unbalanced connection is used, ensure the terminal
(-) is linked to GND.
If the clip LED is lit, reduce the volume.
Check the polarity of the speaker connections.