Bally self-test order and what each step shows
Each press of the coin door test button moves on: all controlled lamps flash; every display digit counts 0-9; each solenoid fires in turn (hold both flipper buttons to show the solenoid number); the sound board plays a tune (Lost World and later, not chime games); then the switch test shows the number of any stuck-closed switch, or 0 in the ball-in-play display when none are stuck (page 15). Further presses step through the bookkeeping and, on some 1982 and later games, adjustments; power off and on to leave.
Systems
Related tips
- Bally/Stern MPU LED self-test: what to expect
- How Bally coils are switched
- All digits on all displays show 2s or 7s
- MPU U9 voltages that show a working reset section
- All DIP switches off can start a self-test after boot
- ROM and EPROM types used on Bally MPUs
- Bally -35 MPU jumper settings by ROM type
- Bally switch matrix: 5 strobes by 8 returns, numbered 1 to 40
Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)