At game start the score motor keeps running and the reset relay won't release. Releasing the relay by hand starts the game, but the Player 1 thousands reel then stays energised.
Score motor runs on at start, a reel locks on: mis-gapped reel switches and solder
Cause: A few score reel switches were mis-gapped and had extra blobs of solder on them, so contacts that should open stayed closed.
Checks
- Unplug the backbox connectors one at a time to find which plug brings the fault in.
- Look closely at every switch on the reels on that plug, including the end-of-stroke switch.
- Look for loose wire strands or solder bridging to a neighbouring tab.
Fix
- Re-gap the score reel switches and remove the excess solder, then retest the reset sequence.
EM backboxes carry line voltage near the transformer. Unplug the game before touching wiring.
Systems
Games
Related tips
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Source: Pinball Repair help group!! (Facebook group)