After entering test mode the backbox beacon keeps running, and capacitor C11 (15,000 mfd 25 V) on the driver board gets hot and smokes.

Getaway: beacon runs nonstop in test and driver board C11 overheats

Cause: Voltage feeding back into the driver board's 20 V supply.

Checks

• Find the large ceramic resistor just above the +20 V test point on the driver board.

Fix

• Fit a 1N4004 diode to the bottom end of that resistor, band toward the driver board and the unbanded end to the resistor, to block the feedback.
• Replace C11 if it has been damaged.

Systems

• WPC Fliptronics

Games

• The Getaway: High Speed II

Related tips

• Driver board filter capacitors wear out
• Choosing a replacement driver board filter capacitor
• +20 V filter capacitor C11 (C10 on WPC-95) blows apart
• Testing a coil diode on the driver board
• Testing lamp-row drivers with a test lamp
• Testing lamp-column drivers with a test lamp
• Why WPC coil diodes are on the driver board
• Pre-WPC-95 resets: replace BR2, C5, C4 and the J101 pins together

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