I've been given some equipment to sell for a project I take part in and all is ok except a fault on the Denon PMA 540 amplifier. It plays fine through both channels via the main inputs (Phono, aux, tuner, CD) but there is almost total loss of volume on one channel when either of the two tape inputs are used. It seems odd that both of the inputs are out of action. Ive tried cleaning the sockets and I can't see anything obvious within the amp. Any ideas or pointers would be most welcome.
Input selector switch needs cleaning?
It may look like this one, only with one rail (from another amplifier):
It may look like this one, only with one rail (from another amplifier):
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I checked the switch and all seemed to be moving ok. Then your post reminded me of something an old HiFi repairer told when dealing with switches. Namely to quickly press or turn them repeatedly to clear any oxidation on the contacts. It worked. Thanks for the reminder.
For project sales it may be good enough.
For a bit better feeling some contact cleaner/deoxit should be applied.
For your own gear the switch should be dismantled and cleaned.
😉