After the saucer kicks the ball out, its coil locks on until power-off. Each replacement TIP102 (Q58) fails shorted and runs hot.

Saucer coil locks on and kills its TIP102 each time: bad diode on the board

Cause: The coil's flyback diode, which on WPC games sits on the driver board next to the transistor, had failed, so every new transistor was destroyed.

Checks

• Test the coil's diode on the driver board (WPC coils have no diode on the coil itself).
• Check the coil resistance and that the coil has no other path to ground.

Fix

• Replace the bad diode on the driver board, then fit a new TIP102.

Systems

• WPC Fliptronics

Games

• The Getaway: High Speed II

Related tips

• Supercharger diverter dead even in test: open TIP102 at Q81 that tested good
• New flipper coil runs very hot and blows fuses: bad or reversed coil diodes
• Pop bumper locks on and burns its coil after a loose wire is refitted: shorted Q48
• 20-second check for shorted TIP102s
• Testing a coil diode on the driver board
• Supercharger diverter opens but won't stay open: replace coil and adjust
• 20-second test for shorted coil driver transistors
• Firing a coil by grounding its TIP102 tab

Source: Pinball Repair help group!! (Facebook group)