SR1, 2, and 3 are silicon controlled rectifiers. They act like a switch that allows current flow from the time they're turned on by the gate lead until the voltage goes to zero, or crosses zero. They typically control the duty cycle of the wave and are used in dimmer circuits as well as other circuits where they're controlling AC, or a rough DC. These appear to supply power to coils A, B, C.

Great video,please don't shut down this channel also!!!!

Thanks for putting this out. In future you should show final product working when possible. Or ask customers to send you short clip of final item fixed and working.

THANKS BOB SAGET! YOU'RE MY HERO!

What exactly and where were you able to order this part? Thanks

Fix more electronics please. Maybe some old 80s-90s radios.

So you mean it doesn't matter what that circuit is for. This is just procedure ner

nice.meh. straightforward diagnostics,