Yamaha A-960: Main Direct switch shuts unit down!?!?

Raccoon1400

Super Member
When you turn the main direct switch on, the lights go off, the relay turns off, and supply voltages collapse. What could possibly do this?
 
Is the bulb burnt out? I've heard of several Yamaha units where the bulb is an integral part of the power supply path when engaged.
 
I managed to convert this unit to LED so the problem will not reoccur. With just the normal series resistor, the circuit did not work. But I added a parallel resistor to burn up the extra current, so it would equal the same spec as the original bulb (14.4V 80mA). Then it worked. I guess the rest of the circuit needed to draw the full 80mA through the bulb to work.
 
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