Nigel,

The switching in this receiver is purely mechanical, and all before the
the volume control, so what you are getting is really odd. I would have
to guess at a cracked circuit board, or some blown ground foils, unless
the switch latching mechanism has failed and allowing multiple sources
to be selected, or there is major corrosion in this unit creating
unwanted signal paths.

Regards,
Tim Schwartz
Bristol Electronics


Nigel Burnett wrote:

NAD 7020e receiver just failed most strangely. If only one source is connected to the appropriate input (such as CD),
the signal can be heard on both channels at about 1/2 volume when tape monitor or video is selected. Tuner is also
audible regardless of which input is selected.

I've disassembled it and cleaned contacts etc to no avail. There's no visible damage under illuminated magnifier.

tia in advance for help

Nigel