After the game resets, the 100s score reel hammers away nonstop, as if the 500-point relay is held on. Unplug the playfield and the reset is normal.
Hundreds reel keeps stepping after reset: a stuck playfield scoring switch
Cause: A scoring switch on the playfield was stuck closed, holding the 500-point relay on.
Checks
- Take the glass off and work every scoring switch by hand.
- Disconnect the drop target switches to rule them out.
- Lift the playfield and check the underside switches, especially toward the back; a switch stop can short the blades.
Fix
- Free and re-gap the stuck switch.
EM games carry line voltage at the cord, transformer and switch; unplug before working under the playfield.
Systems
Games
Related tips
- 1,000-point reels reset but never score for any player: failed 1,000-point relay coil
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- Score reels won't all reset and the stepper keeps running: one zero switch
- A chime, bell or score reel coil is stuck on
Source: Pinball Repair help group!! (Facebook group)