I agree with you but I decided to send it to the expert after all this as I felt out of my depth.I have one of these on my bench, so I am getting familiar with it.
As for the protection flashing, you need to figure out if the circuit is activated by the amps. Measure DCV at TP31,32 on F-5693(Power Amp) with respect to ground. They should be
~ -0.6V when working properly. If it is driven, then the problem is the amps, not the protection ckt.
Accessing the protection pcb is not a treat. It is buried on the back panel.
At least you can manage to adjust the offsets without much trouble.
Measure DCV at TP31,32 on F-5693(Power Amp) with respect to ground. They should be
~ -0.6V when working properly.
These points are wire terminals marked as 31, 32 on the power amp pcb (F-5693) , right above C51,52, connected to pins 149,49 on the limiter pcb (F-5694)TP31/32 are actually on F-5639 (Protection Board)
so what was I missing
John do you have any means to measure the balanced output at the speakers?