The test EPROM does not fire the six special solenoids

Because CPU revisions 1 and 2 cannot fire the special solenoids from software, the test program skips them on all boards. Test those with the CN18 grounding method instead.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Related tips

• Logic chips for the special solenoid transistor pairs
• CPU EPROM jumpers J4 and J5
• Two PIA exceptions when using the PIA test EPROM
• CPU jumpers J4 and J5 set the EPROM size at 5C
• Checking PIA outputs with Leon's test EPROM
• Data East CPU diagnostic test EPROM
• Test EPROM flash codes: which chip failed
• Leon's Data East CPU test EPROM

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part Two, Clay Harrell (pinrepair.com)