Harmon Kardon phantom volume fix

[iamangelfriend]

I have an AVR 300 with a phantom volume problem (goes up and down by itself) . I haven't been able to find a fix even in the Harmon Kardon service manual. They mention it but no directions on how to fix it. Anyone have any ideas what could be wrong?

 

[picbits]

If the volume control is an encoder type switch then try disconnecting it and see if the problem still happens. It could just be a dirty or worn contact in the encoder.

My Arcam has a similar issue but only when actually turning it - it can go up or down even when you are actually just turning it down.

 

[Nigel Goodwin]

Agreed, such problems are almost always a faulty rotary encoder - often carefully stripping them down and cleaning them can cure it (I always give the contracts a little 'bend' as well to increase pressure).

 

[tunedwolf]

Yup, oxidation of the contacts is the usual issue I have run across in the past. A good clean and as Nigel said, re-tension the spring contacts usually cures the problem