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Marantz MR220 Receiver

I just acquired a Marantz MR220 AM-FM receiver. Neither band was working until I squirted some Deoxit into the bandswitch. Now the FM works fine, but no AM sounds at all. The bandswitch is hidden by circuit boards and I'm hesitant to remove them. Could the unit have another issue affecting the AM? My experience is with antique tube gear, so I'm respectfully asking for assistance and advice.

Thank you,

Re: Marantz MR220 Receiver

The schematic and manual are here on hifiengine. Make sure you have 12 volts DC at J108 on the RF board when you switch to AM; if you don't then the bandswitch is dirty or defective.