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.