Centaur uses its solenoid expander for the ball-to-playfield kicker
On Centaur the SEB lets a lamp SCR control the coil that kicks the ball to the playfield, a heavy-current job that tends to burn the relay contacts and crack the SEB header solder joints. Check both when that kicker misbehaves.
Systems
Related tips
- How the solenoid expander board doubles up coils
- Test the coils behind the solenoid expander
- Expander games: check the controlled-lamp power first
- Solenoid expander relay buzzes or does not switch
- Expander-driven coils fire in pairs: drop target coil fitted without its second diode
- Expander game ejects or drops targets at the wrong time
- Replacing the hard-to-find 48 V expander relay
- Drop target coils misfire after LEDs or a new lamp driver: expander boards need bulbs
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)