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Mackie swa1501 - repair help resistor r14 & r22 values

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  • Mackie swa1501 - repair help resistor r14 & r22 values

    Got a question for the experts,
    I have a faulty Mackie SWA1501 Subwoofer amplifier.I have started fault finding by checking all the resistors on the amplifier and this is where I run into my first problem.
    My question is can anyone confirm the values of resistors R14 & R22?The schematic says they should be 4.7k but both resistors fitted to my board are 5.6k,which value is correct?.I wondered if this has caused my amp to eventually fail.
    Ps.I'm new to forums so I hope it doesn't break any rules.

  • #2
    I do not have a clue what R14 & R22 do.
    Can you post the schematic?
    What circuit are they used in?
    It sounds like a factory revision.
    I would look elsewhere for the cause of failure.
    Then again you may not find it.
    Was it a catastrophic failure. (ie: burnt transistors & resistors)
    Sometimes it helps to identify which components failed & in doing so you get an idea of the failure path.
    This can also help when you have to decide which components still measure good but may have been stressed enough that they may cause a future failure.
    Unfortunately repairing a blown SS output section is not as cut & dried as you would want it to be.

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    • #3
      Repair procedure here:
      http://music-electronics-forum.com/t20370/

      Schematic here:
      http://music-electronics-forum.com/t16267/

      I don't know if the resistor change was covered in that discussion. Search for Mackie SWA1501 for more threads.
      ST in Phoenix

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      • #4
        FWIW, the dead one I have for a summer project also has 5600 for R14 & R22.
        ST in Phoenix

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        • #5
          The newest parts list from 2004 has R14 and R22 listed as 5.6k. The schematic is dated 2001, so I'd go with the 5.6k.

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          • #6
            Many thanks for your help hodgy.Now I can carry on with the challenge of trying to repair my amp.

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