Maybe someone found the Snubber to be bad and just moved the red wire to bypass it?I would say Yamaha did not do that...
It is actually and RC network .033µf cap in series with 120Ω resistor.Maybe someone found the Snubber to be bad and just moved the red wire to bypass it?
How to test the Snubber?
Check the ESR it should be about 120Ω..How to test the Snubber?
The configuration you need ( normally open ) for that switch is broken. If you use the other unused terminal -- Off will be ON and ON will be OFF.That is a SPDT snap action switch. Look at page 9 of the spec sheet.
https://www.mouser.com/datasheet/2/307/en_v-1670758.pdf
One terminal is normally open and the other is normally closed. The connection on the side is the common .
I just measured and you are correct.The configuration you need for that switch is broken. If you use the other unused terminal -- Off will be ON and ON will be OFF.
Always looks the same to me.Does the dark side of the Moon always remain the same?
2nd set of measured values were taken after a hairline crack was discovered and repaired on the circuit board.Always looks the same to me.
BTW, what is the difference between the two sets of measured voltages in your chart?



YesHave you tried swapping out TR413 ? Its not switching.
Measures 147 ohm in circuitR417 still 150 Ω ?
Yes 415 with a Kasie 50uf 16vC415 been replaced ?