I’m repairing a tascam 688 and could use some help troubleshooting. the deck will rewind and fast forward like normal. When you press play, nothing happens. The heads and pinch roller don’t even advance forward (they do on RW and FF). The belt is intact and moving the flywheel moves the capstan and vice versa. When you press play the flywheel does not move. could it be the motor? Or something to do with the PCB the transport switches are connected to?