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Displays do not work.

If all displays are totally blank, you probably have a power supply failure or short somewhere. First check the 1/4 A fuse on cabinet bottom board. If it is open, do not replace with a bigger fuse! There is a problem somewhere.

The player score displays operate on 60 V, and the smaller credit/ball in play display uses 42 V. If the 60 V is bad missing then also the 42 V will be bad. First check that the voltages are correct at the power supply P3 connector (pin 5 is ground, pin 1 is 60 V, pin 3 is 42 V) with the cable removed. A bad display module can bring the voltage down, so if the power supply looks good with P3 cable off, try unplugging one display at a time and see which is the bad one. Remember to turn power off before plugging or unplugging any connector!

If the displays light up, but show incorrect numbers or are partly blank, again try unplugging one display at a time to find out if any display has shorts. The problem may also be in CPU board. 7-segment decoders Z16 and Z17 supply the segment data to the displays. Player score displays have an extra vertical segment in the middle of each digit, to show "1" properly centered. Gates Z13-Z15 are used to detect the number 1 and disable the decoder while feeding the extra segment. Credit display does not have the extra segment. Gates Z18-Z21 drive the display digits. If one ore more digits are always blank, suspect these chips.