At game start the first and second player reels reset, then the player unit stops at its 20th step and the score motor keeps running. Lifting a contact at the 20 position, or closing the Z1 relay switch by hand, lets the reset carry on.
Reset stalls with the player unit stuck at step 20: broken wire to a score reel
Cause: The player unit only moves on once every first and second player score reel reports zero through its zero-position switch. A broken wire to one reel's zero switch left that series path open even though each switch tested good on its own.
Checks
- With the game off and the first and second player reels at zero, measure across the Z1 relay's reset-switch wires while pulling Z1 in by hand; an open reading means a break somewhere in that chain.
- Tug gently on each wire at every reel's zero-position switch and at the relays while watching the meter.
Fix
- Find and repair the broken wire, then run a full reset again.
EM games run some circuits on line voltage; unplug the game before working in the backbox or under the playfield.
Systems
Games
Related tips
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- Reset relay stays locked on after scores reset: loose zero-switch arm on a score reel
- Score reels won't all reset and the stepper keeps running: one zero switch
- Player 1 hundreds reel steps only sometimes: dirty contact on the player 2 relay
- Score motor overruns or freezes: worn home switch
- Score relay stuck on, reel does not score
Source: Pinball Repair help group!! (Facebook group)