Bride of Pinbot - Help Needed

[aja734]

I have a Bride of Pinbot machine that is getting a missing pinball error.

From what I researched so far it might be a problem with a switch. I have run the single switch test and confirmed that the following switches were not working.

15 Left Outlane
25 Right Trough
35 Skill Shot 25K
45 Right Loop Bottom
55 Lower Jet Bumper
65 Head Mouth


Because all of these are in the same row of the switch matrix I am thinking that the problem may be more than just a switch. I did find a lose wire on the lower jet bumper.

Any ideas as to where or what I should be looking for to fix the problem.

Thanks in advance

[pinballdaveh]

all of these switches have in common is white/green wire called switch row 5. white/green wire goes to cpu board connector j208. its near bottom right of board. it will have the white/green wire on it. turn off machine , disconnect j208 connector , using dmm do continuity check from connector white/green wire to switches white/green wire to check for good wiring. if all wiring is good cpu board is next to be checked.
u18 or u19 might have been leaked on battery corrosion and might have failed. those chips are lm339 quad comparators and control switch row lines. if you cant trace the wiring pin to the correct chip replace both u18 and u19 if possible use chip sockets instead of soldering chips in directly.

[aja734]

Thanks the issue was some battery corrosion. It's fixed and working again.