How to reset NAD AV 713?

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NAD told me that the AV 713 do not have a reset function but that removing the cords while in test ,ode might help (as you said Harleyjon)... it did not unfortenately. Should I then gather that my problem lies in some damged component? If so, what could it be that gives the wierd channel an existing but extremely low volume, a humming (very low humming) noise. A cap? A transistor? A resistance somewhere? I will mesure DC offset as soon as I get a hold of my multimeter.
 
In that case, I would require a schematic of the amplifier with a pin-out of the DSP. Firstly I would check the output levels on the DSP with an oscilloscope and follow the schematic through to the output stage.
Not wishing to state the obvious but has the sound source got the component required for that particular channel? A CD playing with a non DSP recording will not produce the rear channels accurately.
 
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