Mr. Pinball Tip:

Most chime assemblies include a resting pad or grommet for the chime plunger to rest upon in down position. If this pad or grommet is missing the coil may not have enough power to draw the plunger up and the coil will just hum instead of ring. A small strip of self-adhesive weather-stripping works well for replacing this pad or grommet. Just raising up the plunger a quarter inch is enough to get the mechanism to function properly.

This problem is possible on electromechanical and solid state games with chimes. This problem was first discovered on a 1977 Gottlieb Sinbad, a solid state machine.
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