Generic problem for all Amplifiers and Preamps
Marantz PM-74D
posted by exforge on May 17, 2008
she powers up and i can get some lights to come on but no power output ive checked everything. she just quit one day when i was listining to it. i wish i could find a trouble shooting guide or something to help i like to fix things myself. please help
Best Solution
posted on May 26, 2008
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Just another follow up, those are 10 ohm resistors not 920 like I'd thought. Marantz did some goofy things with the color bands I guess-brown black black red white-but they're 10 ohms for sure. Odd though because the other two right next to them are ten ohms as well-brown black black gold. Mine was biased a little hot, but I adjusted both channels to idle cooler and it works fine now.....
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Solution #2
posted on May 26, 2008
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OOPS-forgot to mention if your bias turns out ok after replacing any blown outputs, turn it off and resolder the collectors (center) pins of all 4 output transistors and turn it back on-should work but you'll need to recheck bias and dc offset. They appear to both be adjustable on the board sticking up on the top side-it's right in the middle and has 4 trim pots on it......
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