Technics SA-303 issues

[Db123]

I recently acquired a technics SA-303 and at first it seemed like it was properly functioning as I was messing with it but as I was listening to it the audio degraded more and more. First the left channel went out completely then both channels. Now, to hear anything come from the receiver, I have to turn the volume all the way up to hear the slightest whisper of a sound. I opened it up already and the capacitors all seem to be in good shape. If anyone could help me out with fixing it or advice it would be greatly appreciated.
Thank you for your time

 

[DaveVoorhis]

Repeatedly work all switches and pots to clean up any oxidisation or dirt on the contacts. If it doesn't work after that, check that the power supply rail voltages are very close to those shown in the service manual, i.e., +40.2 and -40.2 volts.

Also, make sure that your source is working correctly, and try different sources.

 

[Db123]

I think one of the issues was the monitor switch wasn’t turning off correctly. I sprayed it with deoxit and sometimes it doesn’t turn off correctly but it’s working ok. The only other issue is the left channel still isn’t producing any audio.
Thank you for your help!

Repeatedly work all switches and pots to clean up any oxidisation or dirt on the contacts. If it doesn't work after that, check that the power supply rail voltages are very close to those shown in the service manual, i.e., +40.2 and -40.2 volts.

Also, make sure that your source is working correctly, and try different sources.