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BELL PSX-6022 amplifier

P

Pet

Jan 1, 1970
0
Hi!
The amp was out of order and I found some 2SC.. and 2SA output trans.
shorted,some diodes(1n4004),and resistors 5W in output stage too.Now
amp is working,has +-87Vdc,and +-15V from PS.All seems OK but if I
connect speakers to output there is no sound,buzzing or anything.Also
if plug in signal there is no green LED signal on front panel.I
checked with scope the signal path,it is going on first IC amp.
5532(8pins),and on it¨s output is zero(with unplugged output line of
IC too).Ic has supply(28V).I checked IC out of amp(simulated
conditions)and it seems it is working OK.Same thing is on both
chanels(A,B).I did not write many details because hope that someone
had expirience with it so I am in good will to explain things more
detaily.I also have schematic.
So please,if anywho has any information what to do,just write on group
or e-mail would be better.I think some protection is activated but I
could not find what.Thanks in advance!
Pet
 
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