First power-up, step 5: add the driver board, then coil power

Steps

• With the game off, inspect J4 for dull pins, repin if needed, and plug it into the CPU board; it carries data and power to the driver board.
• Switch on with the 28 V coil fuse still out: the CPU lamps should run their attract pattern, and test 16 checks them.
• Power off, refit the 28 V coil fuse and switch on.
• If any coil energizes at power-on, switch off at once and fix the driver board or under-playfield transistors.
• If nothing locks on, run test 17 to fire each solenoid.

Systems

• Gottlieb System 80
• Gottlieb System 80A
• Gottlieb System 80B

Related tips

• Ground mod step 5: direct ground wire to the driver board
• Optional ground mod steps 2 to 9: driver board ground jumpers
• Optional ground mod step 1: ground the 2N3055 cases on the driver board
• Diode-test a driver board 2N6043
• Diode-test a driver board 2N3055
• Coils lock on and burn because of the Gottlieb ground fault
• Test the driver transistors while the board is out for the ground mod
• What the System 80 driver board transistors drive

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)