A 128x32 display that works fine in a Williams, Gottlieb or Data East/Sega/Stern game stays dark or misbehaves once fitted to the Capcom, or the original display acts up.
A good 128x32 display from another maker won't work in a Capcom
Cause: The Capcom display power supply is often faulty: some of its original diodes are too slow for the job.
Checks
- Measure the high-voltage outputs of the display power supply against -110 V, -98 V and +68 V.
Fix
- Replace the slow diodes in the display power supply with fast-recovery types (see the Pinball Magic service bulletin for the parts used).
The display power supply makes roughly -110 V, -98 V and +68 V. Unplug the game and let the supply discharge before touching it.
Systems
Source: Capcom Pinball Problems/Solutions