Flash lamp resistors on the PPB drop solenoid voltage for 12 V bulbs
Flash lamps run from the solenoid supply, so each has a 10 W resistor of roughly 4 to 7 ohms on the MRB or PPB to limit the current. An open resistor leaves its flasher dark; a bypassed one burns bulbs out at once.
Systems
Related tips
- Only flash lamps work when a game starts (L/R reversed games)
- A coil or flasher comes on and stays on at power-up
- Flash lamp stuck on and melting plastics on L/R reversed games
- Under-playfield relay boards and the PPB board
- The solenoid L/R select relay and transistor Q29
- Several bank-switched coils or flashers dead, or firing the wrong device
- Solenoid driver layout: 16 multiplexed plus 14 constant
- No voltage at either lug of a coil
Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)