Hi guys.
I just got a Peavey Bandit Red Sripe (1995 or later) for repair. I received only the amp without speaker encosure.
Acording to the customer, it suddenly stopped working, only a very faint sound is comming out of the speaker.
I checked the power amp and it had an open diode (SZ-13886). I replaced it with a 1N4007 and the power amp works.
The preamp section only works after messing whith all controls and switches, and then wacking it a few times...
Once it starts working, it sounds just like expected.
It has the notorious "IC" brand e-caps in it. None of them looks bulged or otherwise suspicious, though.
I suspect a cold solder joint or in the worst case a broken trace. This preamp pcb has traces on both sides. But it also could be related to an electrolytic cap.
Any ideas what might be going on?
I just got a Peavey Bandit Red Sripe (1995 or later) for repair. I received only the amp without speaker encosure.
Acording to the customer, it suddenly stopped working, only a very faint sound is comming out of the speaker.
I checked the power amp and it had an open diode (SZ-13886). I replaced it with a 1N4007 and the power amp works.
The preamp section only works after messing whith all controls and switches, and then wacking it a few times...
Once it starts working, it sounds just like expected.
It has the notorious "IC" brand e-caps in it. None of them looks bulged or otherwise suspicious, though.
I suspect a cold solder joint or in the worst case a broken trace. This preamp pcb has traces on both sides. But it also could be related to an electrolytic cap.
Any ideas what might be going on?
Sometimes I found a send-return jack on the rear panel with corroded contacts -
which disconnects pre-amp from power amp in an erratic way.
Marshalls are known for that.
which disconnects pre-amp from power amp in an erratic way.
Marshalls are known for that.
You are right, it was in the effects loop. The return jack was corroded...
Danke dir, bucks bunny.
I also have seen this issue with Marshall amps, I had a jcm2000 on my desk recently, this was part of the problem, along with open grid resistors.
Danke dir, bucks bunny.
I also have seen this issue with Marshall amps, I had a jcm2000 on my desk recently, this was part of the problem, along with open grid resistors.