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Audio Mixer Problem.

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Hello All, I have a faulty Citronic PRO-3 audio mixer. It runs on 9V A.C. The seller claims that he connected  a D.C. power supply

and after that the mixer produced a muffled output. The input has a four diode bridge rectifier at the input for the power, several

capacitors, and two 7915A three lead regulators plus one 78M05A three pin device prior to the main mixing board.

Any ideas where to look first when attempting a repair?

Thanks,

Z.

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  • 0

    an 8v bell transformer may be OK - verify the voltage first.

    Note that quite a lot of transformers only generate the rated voltage on 100% load, and open cct or underloaded can be 10-20% more, especially small ones. Verify by meter.

    Mike.

    35V caps and not 12V or 16V ones do suggest rather more than 9V and a bridge. A bit of buzzing out what connects to what with the diodes and earth and so on is probably called for.

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  • 0

    an 8v bell transformer may be OK - verify the voltage first.

    Note that quite a lot of transformers only generate the rated voltage on 100% load, and open cct or underloaded can be 10-20% more, especially small ones. Verify by meter.

    Mike.

    35V caps and not 12V or 16V ones do suggest rather more than 9V and a bridge. A bit of buzzing out what connects to what with the diodes and earth and so on is probably called for.

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