Question about Car Amplifiers
I just got my hands on a rockford fosgate 200s amp, it didn;t power up for me, upon opening it I spotted a burnt trace on the ground side, I patched this and nothign happened, looking closer, R29 and R20 look to have over heated and come un-soldered from the board, I found them and they appear to be 100 Ohm resistors, I replaced them and I get no power up. When power is applied ot the amp those resistors get very very hot. Guessing I have a short somewhere. Any guesses? I can get pictures of the damaged areas of the amp if that will help. I do know electronics fairly well design wise, but is the first time I am taking a crack at a rockford fosgate amp and I don;t have a schematic.
If the resistors go to the gates of the power supply FETs, the FETs are probably shorted. Measure the resistance between the gate and the drain (no power applied to the amp). It should be at least several thousand ohms.
If you can take high res photos, send them to my email address:
Posted on Dec 21, 2007
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