On Monday, 6 November 2017 06:02:48 UTC, David Farber wrote:
This Rickenbacker RM112P monitor amp came to me with the complaint that it
randomly crackles and pops. I plugged it in this afternoon and of course it
didn't make any pops or crackles. I disassembled it and cleaned the
controls. They were only slightly noisy. I was unable to locate a schematic
for it. If it does decide to break down and make the noises, I would like to
be able trace the signal. Does anyone have a link for a schematic? It's very
clean inside. There are a few potential problem places that I see. One is
that there is double sided sticky tape holding the filter capacitors in
place. The p.c. trace is not insulated and I was wondering if that could be
causing a problem. Secondly, there seems to be some type of chemical
reaction happening leaving a flakey orange substance where some of the
components are connected to the circuit board.

http://webpages.charter.net/mrfixite...-terminals.jpg

http://webpages.charter.net/mrfixite...ilter-caps.jpg

Thanks for your reply.

Poor connection. Tap around gently with an insulating stick to locate it.


NT