Leon's memory test results (versions from 11/01/03)
Press the diagnostic button (the lower of two) with Leon's code running. System 3-6 pass: top LED flashes, then the lower one, then both, and normal flashing resumes. Both LEDs on with no flash: IC13 bad; both flash once and stay on: IC19 bad; both flash twice and stay on: IC16 bad. System 7 display: keeps flashing on pass, shows 1 for IC13, 2 for IC19, 3 for IC16.
Systems
Related tips
- System 3-6 SW1 test results
- Memory protect chips to check after the 5101
- Leon's test EPROM: what to burn and where it goes
- Running Leon's test EPROM with the boards still in the game
- Ignore the SW1 memory test unless the board has booted
- CPU chips Leon's test code does not need
- Test the CPU board PIA IC18 with Leon's code
- Use Leon's test EPROM, not the Williams one, for boot faults
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)