Hello all,

I've been having an issue with a pop bumper that engages as soon as I turn the machine on. I replaced the driver transistor, everything worked for a short time and then the issue cropped back up.

Reading about others with the same issue, it sounds like the suggestion is to replace the driver transistor, pre-driver transistor, and the diode all at the same time. Only problem is, I've been poring over the schematics and I can't for the life of me determine which pre-driver transistor and diode I should be replacing. The transistor in question is Q81 for the left pop bumper.

Any advice? Thanks!

Thanks for your reply. There was nothing visibly wrong with the switch - no shorts, appropriate gaps, and so on.