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Old 12th February 2008, 05:45 AM   #1
2pist is offline 2pist  United States
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Join Date: Jun 2004
Location: Utah
Default Pioneer GM-X962

The amp had shorted Mos-fets which I replaced. At idle, it draws about 1/2 amp and appears fine. After about 2 minutes it gradually increases current draw and the left channel output transistors get hot at which point I shut it down. I pulled the output transistors and they check out fine. I even replaced them as I had some NTE equivalants and the same thing happens. Any idea where to go from here?
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Old 12th February 2008, 09:16 AM   #2
sdoom is offline sdoom  Germany
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Join Date: Mar 2004
Location: Heidelberg
Probably some bad solder joints. When I have a broken amp I always start re-soldering all joints first. ( even if they look fine, they dont have to be).
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Old 12th February 2008, 10:08 AM   #3
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Join Date: Nov 2003
Location: Louisiana
sdoom is probably correct. Look closely at the biasing circuit components. The connections often fail on the bias transistors (Q565 in the left channel).
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Old 12th February 2008, 02:39 PM   #4
2pist is offline 2pist  United States
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Join Date: Jun 2004
Location: Utah
Thanks, I'll give resoldering a shot.
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