The 10-point and 500-plus-bonus features don't score, while the 100, 500 and 1000 point features work. Pushing the N and E relays in by hand scores fine.
10 points and 500-plus-bonus don't score: dirty score motor switch 1C
Cause: Score motor switch 1C, which supplies the current path to energise relays N and E, was dirty.
Checks
- Follow the N and E relay coil circuits back on the schematic to their supply switch on the score motor.
- Jumper from the supply side of a scoring switch to the relay to see whether the supply or the switch is missing.
Fix
- File and clean score motor switch 1C and check its gap.
Unplug the game before filing switch contacts; EM wiring carries line voltage in places.
Systems
Games
Related tips
- 1000-point relay, ball index and chime lock on: dirty score motor switch
- Ball not kicked out of the outhole at game start: score motor 1D switch
- Hundreds score reel won't advance though the bell rings: relay switch gap too wide
- Hundreds reel keeps stepping after reset: a stuck playfield scoring switch
- Score motor keeps running at game over, O relay stays in: score motor 2C switch
- Test score relays by hand
- Check the score motor switches before power-up
- Score motor runs on at start, a reel locks on: mis-gapped reel switches and solder
Source: Pinball Repair help group!! (Facebook group)