Marantz PM7200 repair

Marantz PM7200

During the last RepairCafe I got a Marantz PM7200 amplifier in my hands that had a very interesting fault.

Whenever the output signal reached a certain level, the amplifier switched the outputs off (as I learned later on, that is called the protection mode). This symptom could be provoked by either increasing the input level or increasing the amplification by turning the volume control. The effect occurred on the left and right channel. It didn’t matter if I put a signal at both or only at one channel. Also the source of the signal didn’t matter.

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