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My Marantz PM-32 Amplifier has suddenly lost all sound... except for some very quiet higher frequency sound, at very low amplitude (Maybe pre-amplified only)which is just audible with the volume set at around 1/3 of full power.

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  • Anonymous May 11, 2009

    lost all sound and dont turn on

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  • 1,512 Answers

Hi

First thing to check is to see if someone has turned on the Tape Monitor has been turned on by someone. The symptoms you describe certainly sound like it. Check that out and get back to me if it does not solve the problem

regards
robotek

Posted on Nov 08, 2008

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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs 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 which can be 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 or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

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