Marantz 2285B No Sound on Left Channel FM only

biomayhem

Member
I have been wanting a higher power Marantz receiver (70 watts or more) for awhile now and recently was able to acquire a a nice clean 2285b. The receiver had been working for a week or so but when I turned it on yesterday, the left channel had no sound on FM only. Tried phono, tape and aux inputs and had stereo sound on all of them. Had sound from both channel on AM as well. Only FM and FM 25 micros has the left channel missing. Was able to get sound from the left channel with MPX noise filter turned on but the sound level is a lot lower. I cleaned the selector switch (as well as all the knobs) with Deoxit a couple of times but still no left channel on FM. Is the problem due to the MPX board or the tuner itself? Where should I start looking first? THanks.
 
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