Question about Rockford Fosgate Punch P4002 Car Audio Amplifier

1 Answer

Rockford Fosgate P4002

Left channel problem, the speaker when hooked up, peaked to full excursion. amp turns on just fine and right channel works great. Possible output transistors shorted?

Posted by mike sanson on

  • 4 more comments 
  • mike sanson Jun 15, 2007

    It stays at full excursion as well!! might burn speaker if leaved it hooked up.

  • mike sanson Jun 15, 2007

    do I just replace the damaged transistors, pull and test all of them, or is there another problem in the circuit?

  • mike sanson Jun 17, 2007

    Does anyone know of a replacement transisitor for this amp, the part number isnt crossable with NTE
    The # is
    Q220
    BO347
    FQA
    46N15

  • mike sanson Jun 17, 2007

    what do you suggest, replacing both , and is there a cross for these?

  • mike sanson Jun 17, 2007

    that is a power transistor

  • mike sanson Jun 17, 2007

    Its a QFET (same thing) is there a replacement?

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  • Master
  • 3,130 Answers

Yes they are ! And that means the DC is on the speaker and will for sure damage the speaker if it already hasent

Posted on Jun 15, 2007

  • 1 more comment 
  • Anonymous Jun 17, 2007

    You should NEVER ever use a replacement transistor on a power amp! these amps are designed to work in harmoney with the output transistors!

  • Anonymous Jun 17, 2007

    Probably a MosFET

  • Anonymous Jun 18, 2007

    Nope, i would not recomend it. Contact the manufacturer

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