A flipper does not move when its button is pressed.

Pre-Fliptronics: a flipper does nothing

Cause: A blown flipper fuse (F101 or F102 on the driver board), a broken supply wire, or a broken coil winding.

Checks

• Check fuses F101 and F102.
• Game on: each of the three coil lugs should read 50-75 V DC to the side rail. No voltage means a fuse or wire; one lug dead means a broken winding.
• In attract mode, briefly ground the middle lug with a clip lead to the side rail: the coil should pull in.
• Measure the coil with the game off.

Fix

• Replace the fuse, repair the wire, or replace the coil.

Coil circuits carry about 50 V DC; touching the clip to the wrong lug shorts the supply and can blow a fuse.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix

Related tips

• Pre-Fliptronics: flipper lane change does not work
• Flipper buttons not seen by the game (pre-Fliptronics)
• Pre-Fliptronics: weak flipper
• Pre-Fliptronics games need a driver board with the flipper relay
• Pre-Fliptronics: flippers work even with no game running
• Pre-Fliptronics WPC flipper stuck up with power on: failed driver TIP102
• Flipper dead on a System 11 game
• Pre-Fliptronics flipper coil wiring

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)