Firing a coil by grounding its ground lug
Steps
- Game on in attract mode, playfield up, coin door closed on WWF Royal Rumble and later.
- Clip a jumper to the ground strap by the prop rod.
- Briefly touch the other end to the coil's ground lug: the one with the single thinner wire and the non-banded end of the diode. The coil should fire.
- If not, enter diagnostics to release the L/R relay (on Time Machine to The Simpsons, ground Q29 instead) and try again.
- If it still will not fire, the coil is bad or its fuse is blown.
Touching the jumper to the power lug shorts the coil supply to ground, which can blow a fuse or reset the game.
Systems
Related tips
- Which coil lug takes which wire
- Voltage on only one lug of a coil
- Fit a coil diode with its band on the power lug
- Checking for voltage at a coil
- Testing a coil diode
- What the coil diode does and how a bad one shows up
- Check every coil's resistance before first power-up
- Why a locked-on coil goes low resistance
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)