The flipper does nothing when the button is pressed.
Flipper dead on a System 11 game
Cause: Blown fuse, open coil, dirty button, or the flipper enable relay not grounding the buttons.
Checks
- Pulse the coil middle lug to ground. If dead, check the fuse (if it blows again the coil or its diode is shorted) and the coil continuity.
- If it works, briefly ground the coil end lug, then the coil-side button lug.
- If those work, ground the relay-side button lug or the CPU connector pin while pressing the button. If the flipper now works, the enable relay is not grounding the button.
- In game or test mode, check 1J19 pins 1 and 2 on the CPU/driver board.
Fix
- Replace fuse or coil as needed.
- Clean, adjust or replace the flipper button if it fails with the relay side grounded.
- If 1J19 is good, repair the CPU/driver board.
Systems
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
Related tips
- One flipper does not work at all
- How relay-enabled flippers work
- Pre-Fliptronics: a flipper does nothing
- Slingshot or pop bumper will not fire (System 11)
- 50 V coil dead on an early System 11 game
- System 11 backbox boards and supplies
- System 11 coil outputs
- How the System 11 A/C bank select works
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer