I found the plastic button plunger on the front becomes too short to actuate the tiny on/off switch inside. Remove the cover and insert a piece or two of thickish paper (like file-folder thickness) between the plastic plunger and the switch. Let it hang back over the circuit board so it will stay in place.
Your player is no good because laser assembly has lost ability to focus on surface of disk. If player is proprietary you are screwed in that you have to replace it thru the mfg. If not, maybe a good computer drive will work in lieu.
Not likely! Suggest swapping input connection, red RCA connector to white and white to red and see if problem swaps speakers.
If still left channel bad swap speakers left to right see if problem follows speaker.
Check balance adjustment and confirm that it is set to the middle!
Check all other inputs and confirm always no left output.
The goal is to confirm that the left channel is defective!
The service manual is MS3102101 would normally be available from Radio Shack.
Check for defective capacitors or failed solder joints on the PC board. These units are repairable even by DIY however replacement recievers are relatively inexpensive.
Hope this helps?
