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allen and heath pa12_cp powered unit

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  • allen and heath pa12_cp powered unit

    This unit came in with weak to one side...so time to check things over..quick way would be to ensure line outs are ok followed speak test etc.

    After contacting a uk dealer who sent over pdf file to start checking and signal/ volts....also found fx not working...note its high cost to send it off for repair at 50 Per hr...still this one needed a new fx pcb Plus reflow of dry solder cracks and making good the ribbon connects..
    Experience comes with more understanding

  • #2
    It takes lots of service time to check this unit out...stick the coffee on...
    Experience comes with more understanding

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    • #3
      I did solve the main fault's in the end...repair to preamp supply plus a few safety resistors in the fx pcb board.
      Experience comes with more understanding

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      • #4
        Need the schematic anyone have it

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        • #5
          It's here: https://music-electronics-forum.com/...7&d=1382654612
          Note that the speaker outputs (speakons) are wired 'out of phase'* from the factory. Also, the connector board can be re-assembled wrong as it is not keyed.
          *(not really out of phase as amps are run out of phase and corrected at the speaker out speakons. They say this is done to optimize loading of power supply)
          "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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          • #6
            Thank you g1

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