The glove doesn't move or grab balls, often after the game was turned on with the coin door open.

Johnny Mnemonic: glove doesn't work

Cause: The glove motor runs off the 20 V flasher supply, which shuts off with the coin door open, so the power-on glove test fails until the game resets. Otherwise the hand magnet wires break inside their insulation from movement.

Checks

• Close the coin door and reset the game.
• Check the hand magnet in solenoid test. With its driver board fuse good (probably F103), both magnet leads should show about 70 V; voltage on only one lead means a broken wire.

Fix

• Replace the magnet leads with new stranded wire.

Systems

• WPC-Security (WPC-S)

Games

• Johnny Mnemonic

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)