I am currently repairing a Yamaha A-960 amplifier. One issue was a burnt out power switch that needed replacing. The original switch is mounted on a small pcb but the only replacement switches I could find did not have pcb pins. The new switch works fine but on the original switch there is a shielded wire connected from the main switch through two 680pf capacitors mounted on the pcb to the secondary of the transformer. (See image)
I am in Australia but this connection is not present on the US or Canadian circuit diagrams in the service manual. I guess the line voltage and/or frequency are the reason for this
I have a couple of questions
What is the purpose of this connection?
The amplifier seems to work without it so is it ok to leave off this connection or do I need to find another way of connecting the capacitors to the switch?
Thanks
Robert
I am in Australia but this connection is not present on the US or Canadian circuit diagrams in the service manual. I guess the line voltage and/or frequency are the reason for this
I have a couple of questions
What is the purpose of this connection?
The amplifier seems to work without it so is it ok to leave off this connection or do I need to find another way of connecting the capacitors to the switch?
Thanks
Robert