A Williams EM resets erratically or not at all.
Williams reset problems: cracked joints on score reel switches
Cause: Wires on the reel zero, nine and EOS switches often have cracked solder joints from poor factory soldering.
Checks
- Tug gently on each wire at the reel switches; expect at least one loose one.
Fix
- Cut the wire clean, twist and tin it, then heat the lug and flow the tinned wire into a smooth new joint.
Systems
Related tips
- How the score motor resets the reels
- Score reel EOS switch: what happens when it fails
- Clean and adjust score reel nine and zero switches
- EM score reel will not reset to zero
- Replay scores never award a credit: cracked joints on the score reel boards
- Score reels won't all reset and the stepper keeps running: one zero switch
- Score reels by maker
- How score reels come out, by maker
Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)