On Baby Pac-Man and Granny, a GI fuse kills the feature lamps
These games take the zero-cross signal for the CPU-controlled lamps from the GI circuit, so a blown GI fuse also stops the feature lamps. This is why a -54 module should not replace their -132.
Systems
Games
Related tips
- Baby Pac-Man playfield GI never comes on for pinball mode
- Baby Pac-Man and Granny MPUs look for 6 V AC, not 43 V
- Two inserts faintly lit all the time: failed lamp driver SCR
- Skip the driver board mods on Baby Pac-Man
- Baby Pac-Man solenoid board select lines
- Convert a -35 MPU to a -133 for Baby Pac-Man and similar games
- Mr. & Mrs. Pac-Man GI flashes in attract but stays off in play
- One controlled lamp does not light
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part One, Clay Harrell (pinrepair.com)