Listen for flipper relay K1 when entering diagnostics
The flippers only get ground during a game or in diagnostics, through relay K1 on the CPU board (4-pole, 40 ohm, 6 V). You should hear K1 click when you enter diagnostics; if it stays silent, look at K1 and its driver.
Systems
Related tips
- No flippers at all: flipper relay K1 not pulling in
- Flipper enable relay K1 on the CPU board
- How relay-enabled flippers work
- Coin door test buttons won't enter diagnostics: jumper test at the CPU plug
- Which transistor drives the A/C select relay
- Test points for relay-style flippers
- CPU sound diagnostic switch SW1 results
- Blanking LED wrong, or all solenoids pulse and blow a fuse at power-on
Source: Repairing Williams System 11 Pinball 1986 to 1990, Deel 1, Clay Harrell (pinrepair.com)