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Quick if possible: Mackie 808s bias test points

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  • Quick if possible: Mackie 808s bias test points

    I have a "fire" to put out here. Mackie 808s with the bias set too high causing it to thermal shutdown under normal use. I misplaced the document detailing the bias test points. I need to get this thing ready for the door by tonite. Anyone have those TPs handy?
    The farmer takes a wife, the barber takes a pole....

  • #2
    I would try e mail Sampson for the schematic, and see whats in there.
    I mean, what's the load that the amp is running in ohms?
    If the load is too much it will shut down too...

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    • #3
      These are (incomplete - missing mixer sch) for PPM-608S, but the power amp section may be the same for the 808S
      I know this is "late" but may help someone else down the track
      Attached Files

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      • #4
        Got it taken care of. Its been a while since I've been into one of these....I forgot the test points are noted on the board in silkscreen.
        The farmer takes a wife, the barber takes a pole....

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