How relay-enabled flippers work
The flipper enable relay grounds the flipper buttons only during a game or test. Pressing a button sends heavy current through the power winding, the normally closed end-of-stroke switch and the relay contact. At full stroke the end-of-stroke switch opens, leaving only the hold winding powered.
Systems
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
Related tips
- Flipper dead on a System 11 game
- Flipper enable relay K1 on the CPU board
- Early WPC games use relay-style flippers
- Listen for flipper relay K1 when entering diagnostics
- Which output drives the bank select relay
- Pre-Fliptronics games need a driver board with the flipper relay
- 50 V coil dead on an early System 11 game
- No flippers at all: flipper relay K1 not pulling in
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer