Black Hole: new motor on the original gearbox

Steps

• Take the motor assembly off the backglass and remove its metal cover (bend back two tabs).
• Drill out the three rivets holding the gearbox with a 7/64" bit and separate the motor and gear plate.
• Pull the small brass gear off the old motor shaft and unscrew the old motor from the gear plate.
• Cut the shaft of a 9-18 V DC hobby motor to the old length (about 7 mm) and press the brass gear on.
• Screw the new motor to the gear plate (slightly longer screws may be needed).
• Tap the old rivet holes 6-32, open the gear plate holes with a 9/64" bit and pack the gearbox with grease.
• Reassemble with three 1/2" 6-32 screws and refit.
• Put a 10 ohm 5 W resistor in the motor power lead (white/orange) so the disc turns at 1 to 10 rpm; change the value if it stalls.
• Add the run-only-in-game modification so the new motor lasts.

Systems

• Gottlieb System 80

Games

• Black Hole

Related tips

• Black Hole: run the backglass motor only during a game (transistor method)
• Black Hole playfield-mounted transistors Q1 to Q5
• Black Hole DIP switch traps
• Black Hole and Haunted House third relay ("U")
• Black Hole up-kicker on a pop bumper driver board
• Black Hole solenoid test order (manual correction)
• Black Hole driver board: which transistor runs which coil
• Black Hole up-kicker rarely needs the driver board conversion

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