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?

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  • 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 
  • Larry  Dillon
    Larry Dillon 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!

  • Larry  Dillon
    Larry Dillon Jun 17, 2007

    Probably a MosFET

  • Larry  Dillon
    Larry Dillon Jun 18, 2007

    Nope, i would not recomend it. Contact the manufacturer

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