The spinning disc behind the Black Hole backglass is stopped or very noisy.

Black Hole backglass disc not turning or noisy

Cause: The motor runs the whole time the game is on, so the motor or its gears wear out.

Checks

• Game off: try turning the disc by hand. If it will not turn, the gearbox is probably fine and only the motor needs replacing.
• If it spins freely (with the set screw tight), the gears are stripped and the whole motor and gearbox must go.

Fix

• Replace the motor on the original gearbox, or fit a new continuous-duty gear motor.
• Wire the motor so it runs only during play.

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)