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Midi M-85 Midi M-959 Compact Audio System protect mode keeps coming on when trying to play CD or tune radio.

Posted by marion_wroug on

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caroldon

Donald DCruz

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SOURCE: compact audio systeem protect mode keeps coming

It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's fitted for both the channels, Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.
You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board, maybe the protect circuit by itself is shutting off due to a faulty bias , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

Posted on Jul 01, 2011

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CD Receiver with WMA/MP3 decoder Built-in

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