[Tandy01]

Originally Posted by Radio_Dave

I would check the pcb for the push buttons for for broken tracks. It's a poorly designed, flimsy part and could be flexing when you return the chassis to the cabinet

Thanks Dave. I've had a poke around and everything seems sound around the switches.

Originally Posted by ricard

Sometimes there is a series resistor and associated switch which achieves essentially the same function. I've had the pinch roller solenoid in a Grundig TK819 end up in an oscillating state when activated due to failure of the resistor - essentially, the whole mechanism turns into a (low frequency) buzzer.

Thanks. I think you might have put your finger on it. If I'm looking at the right bit of the circuit diagram, there seem to be voltage dependent resistors in series & parallel with the solenoid coil. I will investigate further.