You have probably solved this years ago, but here's my answer.
This is R204 on the PSU board. It is a 10k resistor and was inadequately specified by Quad. These routinely overheat, singeing the PCB.
It should be replaced by a 1W rated resistor and best is to leave a slight air gap between the body of the resistor and the pcb when soldering it into position.
This is R204 on the PSU board. It is a 10k resistor and was inadequately specified by Quad. These routinely overheat, singeing the PCB.
It should be replaced by a 1W rated resistor and best is to leave a slight air gap between the body of the resistor and the pcb when soldering it into position.