I have an annoying missing B segment on the Right Display of a Sys. 11 game. It's a Bally, and uses two 16 character displays, Left and Right. Since I bought it, the segment has been missing. All the other issues are out of the way on the game, except for this.
I tracked through the schematic, and the B segment goes through a 10k resistor, 4049 chip, 7018 chip, and an 18k resistor. All of these checked out, but just to be sure I replaced the cheap resistors and put a new 4049 chip in just in case. 7018s are harder to find and more expensive, but it checks out anyway according to my multimeter.
Pinrepair lists a capacitor/resistor network on the main board as a possible culprit, but this doesn't seem to be that kind of issue either. So, what else could it be? Could the glass be shorted?
I tracked through the schematic, and the B segment goes through a 10k resistor, 4049 chip, 7018 chip, and an 18k resistor. All of these checked out, but just to be sure I replaced the cheap resistors and put a new 4049 chip in just in case. 7018s are harder to find and more expensive, but it checks out anyway according to my multimeter.
Pinrepair lists a capacitor/resistor network on the main board as a possible culprit, but this doesn't seem to be that kind of issue either. So, what else could it be? Could the glass be shorted?