Question about Rockford Fosgate Punch 801X Car Audio Amplifier

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Blown fuse I was driving around the other day when my bass suddenly cut out. I felt my amp and it felt very warm even though I didn't have it very loud. I got home and checked my wiring fuse and found it was blown. I replaced it and it immediately blew again. I opened up my amp yesterday and was poking around with an ohmmeter. I found very low resistances on all the transistors in one of the channels versus the other channel (i.e. 1 ohm vs. 4.5k), but nothing was burned out. What should I do?

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Re: Blown fuse

This can be caused by too low of an impedance from the way the speakers are wired, bad speakers, crossed/shorted speaker wires, and sometimes even a poor charging system (if the amp goes into protect when the volume is turned up) and is usually what the problem is 95% of the time. As you said, very possible to be shorted output devices or shorted power supply rectifiers. Beyond that, it could be a shorted filter cap, some sort of short across the power rails, some sort of short across the output, shorts across the primary. And of course loose hardware - any missing screws or nuts? A loose one under a pc board can short out most anything.

Posted on Nov 02, 2006

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