Hitting a 100-point target rings the bell but the 100s score reel doesn't move. Pushing the scoring relay by hand only sometimes advances the reel, and a contact can be seen sparking. The reels reset to zero fine at game start.
Hundreds score reel won't advance though the bell rings: relay switch gap too wide
Cause: The gap on the 100s scoring relay's switch (and the outer switch on the same stack) was too wide, so the contacts closed late or not at all and arced instead of passing current to the reel coil.
Checks
- Operate the 100s relay by hand and watch its switch contacts close; look for sparking.
- Check the reel coil for signs of overheating.
Fix
- Adjust the switch blades so the contacts close during the first half of the relay's travel and wipe together during the second half, then clean them.
EM games have line-voltage circuits: unplug the game before adjusting switches.
Systems
Games
Related tips
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- Reset relay stays locked on after scores reset: loose zero-switch arm on a score reel
- Every hundred-point score also adds a thousand
- Players 3 and 4 reset but players 1 and 2 never do at game start
- Player 1 hundreds reel steps only sometimes: dirty contact on the player 2 relay
- Score motor runs on at start, a reel locks on: mis-gapped reel switches and solder
Source: Pinball Repair help group!! (Facebook group)