Question about Alpine PDX-4.100 Car Audio Amplifier

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Amp doesnt work

Okay, my amp was working fine for about 3 weeks.  I was listening to music one day last week when the volume cut out completely.  The power light on the amp was slightly flickering.  Headunit and all connections check out.  Now the amp was cutting on occasionally, but when I went to try and fix it I found pushing in hard on the fuses would make it play.  After doing that though it wont cut back on at all now.  Any suggestions?

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  • Colorada Oct 25, 2007

    it was new when I bought it but, it was on ebay.  Thanks for helping me though.  What should I try?



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If you've only had it for 3 weeks and it's under warranty, you need to send it to a warranty station.
If there is no warranty and you want to try to find/repair the problem yourself, let me know.

Posted on Oct 24, 2007

  • Perry Babin Oct 25, 2007

    There's no guarantee that you can repair it and you could make a mistake that could cause more damage.

    If the fuses are tight in the holders and pull out evenly (both contacts have equal pressure on the fuse blades), there are likely broken connections on the holders or on the power connectors. If you want to remove the cover, you would look for broken/cracked solder connections. If you see a ring around the solder joint, it's likely a broken connection. Since yours has been intermittant, it should be obvious.

    Do NOT power up the amp while it's out of the sink. When you do apply power, all power semiconductors MUST be clamped tightly to the heatsink.

    I'd suggest that you read the text in the yellow box on the following page:

    Let me know what you find.



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