The flipper buzzes or flutters when held up instead of staying firmly at the top.
Flipper flutters and will not hold up
Cause: A broken hold (thin) winding, often at a lug; an EOS switch with too little blade tension; dirty or weak cabinet switches; or a badly worn coil stop.
Checks
- Look for the thin winding broken away from a lug and measure the coil (the break may be intermittent).
- Check the EOS tension; adjusting it with the game on and the button held gives a truer result than moving the bat by hand on worn linkage.
- Check the cabinet switches are clean and have good tension.
Fix
- Repair or replace the coil, adjust the EOS, clean the switches, or replace the coil stop.
When adjusting the EOS with power on, do not let it touch the low-voltage lane change switch next to it.
Systems
Related tips
- Flipper buzzes and vibrates when held
- Flipper buzzes when held up
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- How relay-enabled flippers work
- How the two windings of a flipper coil work
- How a System 11 flipper coil works
- Flipper rebuild kits
Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)