Ground mod step 4: double the +5 V and ground pins between CPU and driver boards
Steps
- Crimp Molex 08-03-0304 (series 4366, for 18-gauge wire) pins onto four short wires.
- Push two into the back of driver board plug A3-J1 at the far right as you face the boards, and two into the front of CPU plug A1-J4 at the far right.
- Splice the two outer wires together (ground) and the two inner wires together (+5 V).
- Some 80B games already have this from the factory, and ready-made gold-pin cables with doubled pins exist.
Systems
Related tips
- Remove pins from a Gottlieb double-sided connector
- Ground mod step 2: repin the power supply to CPU power cable
- CPU board connector A1J4 (to the driver board)
- Molex housings and pins for the System 80 CPU connectors
- How Gottlieb numbers double-sided connector pins
- Ground mod step 1: CPU board ground wire
- System 80 CPU board connectors and what they carry
- Which CPU connector housings can be reused
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)