The first 1-point switch hit scores once, then the 1s relay and the bell relay stay energised and no more single points score until the ball drains and things reset. Any 1-point switch causes the same thing.
Scores one point, then the 1s relay and bell stay pulled in until the ball drains
Cause: The circuit holding the 1s relay in is not being broken: usually the end-of-stroke switch on the 1s score reel is out of adjustment, or a 1-point scoring switch (or a contact on the 1s relay itself) is dirty or stuck closed.
Checks
- Watch the 1s score reel step: its end-of-stroke switch should open at the end of each step.
- Check that none of the 1-point playfield switches are stuck closed.
- Inspect and clean the switch stack on the 1s relay that drives the reel.
Fix
- Clean and re-gap the 1s reel end-of-stroke switch and the 1s relay contacts so the hold circuit opens after each step.
EM games run some circuits on line voltage; unplug the game before working on relays and switch stacks.
Systems
Games
Related tips
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- 1,000-point reels reset but never score for any player: failed 1,000-point relay coil
- Hundreds score reel won't advance though the bell rings: relay switch gap too wide
- 1000-point relay, ball index and chime lock on: dirty score motor switch
- EM: outhole kicks the ball back only once per game: dirty score motor index switch
Source: Pinball Repair help group!! (Facebook group)