Checking for power at a coil or flasher
Steps
- Game on, meter on DC volts, black lead to the side rail or another ground.
- Touch the red lead to each lug of the coil: expect 50 to 60 V on both. Flashers should show 12 to 20 V.
- No voltage: look for a blown fuse or a broken daisy-chain link upstream.
- Voltage on just one lug: the coil or flasher itself is open.
Systems
Related tips
- Testing a dead coil or flasher
- Gottlieb coil wrappers are colour coded
- House-numbered coils need the chart, not the number
- Wico coil numbers start with the original maker code
- Cue Ball Wizard: coils holding on weakly (BUZ72L MosFETs)
- Testing the diode on a coil
- Replacing a solenoid coil
Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)