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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Help ! Has anyone repaired a Marantz PM57 Amp ?
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 |
#2
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Help ! Has anyone repaired a Marantz PM57 Amp ?
Jack wrote in message
... 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 magic word "variac" At least with a stereo amp you can DVM "diode" test between good and bad channels and remove obvious bad parts. Then gently power up , via a variac, no speakers, monitoring a few pairs of voltages to home in on some/all ? remaining obviously bad. Rebuild and power up again via variac , monitoring a few pairs of votages, etc, When all matches across , connect speakers, again powering up via variac , increasing volume gradually , still monitoring a few voltage pairs -- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on http://home.graffiti.net/diverse:graffiti.net/ |
#3
Posted to sci.electronics.repair
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Help ! Has anyone repaired a Marantz PM57 Amp ?
"Jack" wrote in message ... 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: 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. |
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