A1-J4, A3-J1 and A3-J3 are double-sided edge connectors
Control board J4 and driver board J1 and J3 use both sides of the card edge: numbered pins are on one side and lettered pins on the other, and the drawing marks which pins are on the rear.
Systems
Related tips
- How double-sided edge connector pins are numbered
- Control board A1-J1 power connector
- Control board display connectors A1-J2 and A1-J3
- Switch matrix connectors A1-J5 and A1-J6
- Control board A1-J4 to driver board pinout
- Driver board A3-J2 backbox lamps
- Driver board A3-J4 coil outputs
- Driver board A3-J5 and A3-J6
Source: System 80 Service Manual, Gottlieb