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Thread: Help with Pmh2000

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    Help with Pmh2000

    Hello I am repairing a Pmh2000, and after having replaced all the transistor of the power plate, and check diodes, resistors of the power part I still have 65 volts in one of the outputs, I also lack the voltage of +15, the of -15 if it is. The ICs 4580 and 3080 are damaged, because they are connected to +15 ?. Could you tell me where to go? Many thanks

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    Senior Member vintagekiki's Avatar
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    For a start, carefully examine the schematics, compare the measured voltages with the schematic and replace the defective components.
    PMH2000 schematic is located here:


    https://music-electronics-forum.com/showthread.php?t=41121

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    Supporting Member Jazz P Bass's Avatar
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    More direct link to the schematic: https://music-electronics-forum.com/...6&d=1560185842

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    Lifetime Member Enzo's Avatar
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    Repair your power supplies before deciding ICs are bad. They cannot possibly work with one of their power supplies missing.

    The whole circuit cannot work without proper power supply. I can say that about ANY powered circuit.

    You can remove the 3080 and the amp should still work. Just a test.

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    In the scheme 3080, would be the Lm3080?

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    Lifetime Member Enzo's Avatar
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    I am sorry, I was being casual, and I shouldn't.

    Yes, the 3080 means the LM3080. It is used as a compressor, and if removed, the amp still works but loses the compressing function. That is it will no longer prevent clipping if over driven.

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