Hi everyone, i got a nice 5220 as a trade, in non working condition. No play, ff, rew, nothing. The motor was dead. I fast realized that the problem is in that little board in the attached pic. Does anyone know what's the function of it? The power, before entering the actual motor, pass through this simple circuit. If i bypass the circuit, the motor works and the deck sounds great. Unfortunately that board is not explained in the service manual: it's considered part of the motor. Thanks for any info!!