Check for power at a coil or flashlamp
Steps
- Fit F2, lift the playfield and let the game reach attract mode.
- Put the black meter lead on the metal side rail.
- Touch the red lead to each lug of the coil or flashlamp: both should read about 28 V.
- Only one lug live: the coil or lamp is open.
- Neither lug live: follow the thick daisy-chained power wire back to find where it has broken off.
Systems
Related tips
- Check every coil resistance before first power-up
- Which coil lug gets the power wire
- Which way a coil diode goes
- Which way a coil diode goes
- Check the coil diode after replacing a driver
- Old Williams SA/SG 23-850 coils and their AE/AL replacements
- Coil outputs available on System 3-7
- No solenoid voltage
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)