After power supply repairs the display shows garbage at power-up, the playfield lamps don't flash, the start button does nothing, and the speakers may screech.
Game won't start properly after power supply work: trim the 5 V down
Cause: The adjustable +5 V logic supply was set a little too high for this game's boards.
Checks
- Measure the +5 V at the CPU board.
- Note the solenoid supply reads about 70 V with no load even though the prints say about 50 V; that is normal for an unregulated supply.
Fix
- Turn the 5 V adjustment down slightly (here from 5.15 V to about 5.07 V) and re-test.
Games
Source: Pinball Repair help group!! (Facebook group)