I've got most of Pit Stop running, have one issue. The targets that do Advance 5 (i.e. move the cars/lights on the race track forward to complete a lap) aren't doing it. It advances maybe 2-3 inconsistently, never the full 5 unless the targets are held down. I looked at the diagrams, all of these are tied to the 5-Advance-Relay; I manually triggered that relay, and it still causes the 2-3 advance. The player advance unit (under the play field, controlling the race track lights) has not been rebuilt yet, but nothing is sticking as far as I can tell.

It's a bit of a drag, as the it's really hard to score the laps with these targets not behaving correctly.

Any suggestions I could follow?

Hey HowardR, I ran a 2 player game and when triggering the ADV 5 targets both tracks (yellow and red lights) are behaving the same: irregular 1 to 4 advances (instead of the expected 5).

It'd be weird for both p1 and p2 advance units to be malfunctioning the same. Makes me think that something's wrong the the ADV 5 Relay - but I don't know what to check there... Suggestions?

It does advance a complete lap on the side drain rollovers and the top left extra ball shot (when they are lit).

I have the schematics I'll check once at home. I didn't realize the game motor triggered on these events, but you can hear it firing in this clip I took replicating the problem:

I went over the diagram yesterday, but don't see any of the motor switches connecting to the 5 adv relay. Did I miss something?

IMG_5371 (resized).JPG

As suggested, I looked into how the Impulse stack switches work; I spent a little time filing the Impulse stack connectors some, but it didn't improve the situation. I made an interesting discovery. The cams can be slid sideways a millimeter or so, so the 'needle' edge of each stack switch is on the middle of the cams. When there, the 5 Advance works correctly. It seems that the switch needle is worn out/notched in the middle and not effectively doing full travel for the switch. After a few runs in the new position it returns to center, and starts misbehaving again.

How do folks fix this?

I've uploaded a clip of the issue so you can see how I got it to work briefly by pushing the cam so the switch stack needles are contacting the cam the side rather than the middle.

Allright! Great news folks! I took off the switches from the motor, and found I could swap them around. I took the '4 games for 25 cents' leaf needle (I imagine I won't use that in free play) and swapped it to the impulse stack. It was misbehaving a bit but eventually settled in when the cam lined up. Now it triggers the 5 advance as expected.

I read nylon on nylon doesn't really wear itself out. My guess is that they lubed the cams some, and then dust got in there and finely sanded it down over time. I cleaned off the old grease off the cam as part of this work.

You can see the worn part in the attached pics. I'll test more over the next few days and call it resolved.

PitStop-ScoreMotor-Switches (resized).JPG

PitStop-WornMotorNeedleSwitchLeafs (resized).JPG