Question about Rockford Fosgate 100a2 Car Audio Amplifier

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Crackling in 1 channel

I have an old school punch 75 pre hd that has a bad crackling in 1 channel. It was both channels. I replaced all output fets, all the ao6 and a56 transistors, all emitter resistors and 1 side works great but the other does not. The side that does not work will not bias either. I did find a very burnt resistor just in front of the transformer but don't know if it is part of the chaneel or causing the problem. Its so burnt I can't tell the value. Its right next to a IN5336B diode. A picture would be nice. Please help??

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MJE182 is a replacement for the now obsolete D40D8, although the D40D8 is still available on e-bay.

Posted on Jan 09, 2016

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Sounds like the D40D8 transistor the one that stands straight up on the board and not heatsunk! there are two of them. could have a cold solder joint there. have had a few of these problems from people doing hack repairs to them. they look like this http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290297644906&ssPageName=STRK:MEWNX:IT

Posted on Sep 16, 2009

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Posted on Jan 02, 2017

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INSTALLATION

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Possibly bad news I am sad to say. You might have lost the transistor in the right channel output Or if it is an IC that. The things on the heat-sink! However you might be lucky and it might be just either a bias resistor or a ceramic capacitor. The small components are cheap the bigger ones tend not to be. Resistors often look burnt, but apart from that is a case of replace and see.

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