Adjust a leaf switch at the stack
Steps
- Adjust only the short fixed blade (and its damping blade if fitted).
- Slide the contact adjuster down to the bakelite and bend gently there; a few thousandths of an inch is enough.
- Leave the long moving blade alone unless someone bent it before, or it is not resting on its actuator (the wire form on a rollover or the armature on a relay).
- On relays, blades at the top of the armature slot get the most travel; blades at the bottom get less and are harder to adjust.
Systems
Related tips
- New to EMs? Do not adjust switches that work
- Gauge switch health by trying the stack screws
- Adjusting more than a few switches means something else is wrong
- Why EM switch contacts get dirty
- File EM switch contacts
- Cleaning leaf switch contacts
- Neighbouring switches in a stack short together
- Switch gap and adjustment targets
Source: Repairing Electro-Mechanical (EM) Coin Operated Games to 1978, Part One, Clay Harrell (pinrepair.com)