I have already done a bunch of research on other threads related to this error message on my Shadow.

Facts:

- error message on startup: check F115 and F116, J112 and opto 12v supply.

- just prior to error machine was kicking out all the balls and launching them. Now (with error message) game won't start.

- ALL optos controlled by The SW10 board are not working in test mode.

- other optos are working

- fuses all good

- power at J116, 117, and 118 all good. (Checked voltage at pin 2)

- The LED on opto sw10 board (under playfield) is NOT LIT.

- Yet there is power going to the board and the ground checks out.

- all other opto boards have a lit LED and their corresponding switches work.

- possibly unrelated, but I was starting to get occasional resets the week before this happened.

I am close to replacing the LM339s on SW1o opto board but just wanted to make sure it isn't something else.

I have checked for a detached wire in the chain and did not find one, but some are hard to follow.

Questions:

- If the sw10 board is getting power, can a bad component on the board keep the LED from coming on? (Bad diode? Bad chip? Bad filtered capacitor?)

Thanks for your help.

Yeah, luckily have a few on hand and some sockets. Will have at it later tonight with the soldering iron when the kids are down. Unless I'm advised to try anything else first.

Did not see evidence of major corrosion at a quick glance, but will check it when I remove the board. Mounted I see mostly the backside of the board though. And the back of that board did seem a bit darker behind where the caps are. Will check those traces when it's off the machine too. Are those prone to leaking? Thanks.

Thanks for the advice. I will definitely check that out. Had no idea that could be a weak spot. I know about battery damage, now I know to look out for this too.