Hi guys I have a prm80 L UW -PRM8025  and the backlighting has failed .
light bulbs are ok and no 8 volts on pin 5 on the microphone .This
occured after a mic that  was wired wrong was tried in the mic socket.
I have service manual to it but the model must be different as very few
diagrams match up.any sugestions .both 5 volt and 9 volt regs are ok 





 












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