Jumper JW7 stays out
JW7, below and left of the 6803 chip, adds a 3.3k pull-up to the processor's serial receive pin and should always be left out.
Systems
Related tips
- Factory CPU jumpers by game
- Electronic spares for 6803 board repair
- Cybernaut can have a -35, 6802 or 6803 boardset
- What is on the 6803 CPU board
- CPU board landmarks: battery, LED, relay and ROMs
- CPU board test points
- Which games use one or two game ROMs
- Bench-test a CPU board with the 6803 test EPROM
Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)