Just recently picked up an MZ-R2. When you put a disc in any press play or stop, it makes a short motor noise but does nothing else. However when activating test mode all the systems seem to be working OK. The display comes on, the motor moves, power supply is good, etc.
I thought it might be the door sensor. I disassembled the lid and managed to find the door switch - neither activating the switch nor bridging the traces coming out of it with a pair of tweezers had any effect.
Does anyone have any other suggestions of what might be at fault?