Picked up a Who Dunnit last night. Ran tests & played at seller's place, all was fine. Drove home about 4 hours, set up, played several games for an hour or two, all worked fine. This morning I power it up & it immediately starts launching balls. Once all settled down, it now displays the following error when turned on:
"Check fuses F115, F116, J112 and opto 12v supply".

So obviously I replaced the F115/6 fuses and that did not fix. Reseated J112 connector, no-go. So now I guess I'm at the opto 12v supply. I know how to solder & stuff, but am not well versed in troubleshooting boards...need some help.

When I run diagnostic tests now, none of the solenoids fire and no flashers work. Thanks in advance

LED 7 is not illuminated, LED 1 is

image.jpg

Maybe this is the culprit? What should be in this hole that says TP1 12VU?

Will check, thanks for the help. I just tested all diodes on coin door board per above, and all checked out fine. Safe to assume the problem resides on the power driver?

Thanks to all, yes figured out the coin door kill switch All solenoids but 1 fired in test. Reseated all connections in backbox & under playfield. This may take me a few days to find the time to sit down with this and run through the wiki step by step, so wanted to say thanks to all while I was thinking about it. Chris, I'll be in touch if I need your expertise