Help ! Has anyone repaired a Marantz PM57 Amp ?

[Jack]

I was checking the "idle current" on my beloved PM57 and a freak
accident crashed the right amp - the scope ground lead popped loose
and fell on a component in the circuit and instant smoke ! I was
crushed. I love this amp. Its reproduction is superb. So, I rplaced a
few parts and turned the amp on and more smoke ! What am I doing
wrong ? I am a retired EE with many successful years of design and
building of audio equipment - should I quietly give up ? Someone
mentioned that the "new" Marantz amps are practically impossible to
repair because most of the parts are "selected" when they are built -
Thanks, Jack

 

[Mark D. Zacharias]

I was checking the "idle current" on my beloved PM57 and a freak
accident crashed the right amp - the scope ground lead popped loose
and fell on a component in the circuit and instant smoke ! I was
crushed. I love this amp. Its reproduction is superb. So, I rplaced a
few parts and turned the amp on and more smoke ! What am I doing
wrong ? I am a retired EE with many successful years of design and
building of audio equipment - should I quietly give up ? Someone
mentioned that the "new" Marantz amps are practically impossible to
repair because most of the parts are "selected" when they are built -
Thanks, Jack

I have a PDF of the service manual for this model. It is about 2.75 meg in
size, and I can e-mail it to you if you like, and assuming you can take the
attachment.

(This is a good time to mention to the group that I an changing my e-mail
address for the time being...)

You can e-mail me at:

[email protected]

and reverse the domain to read "sbcglobal" and notice there is an underscore
_ between my first and last name.

and I will send the manual.


Also, I have some experience repairing amps and might be able to help with
technical advice.


Mark Z.