Raising the WPC-95 +5 V to about 5.2 V

Steps

• The WPC-95 5 V regulator is an adjustable LM317 set by a 750 ohm 1/2 W resistor at R1.
• Replace R1 with a 780 ohm resistor to raise the output to about 5.2 V.
• Use only for stubborn resets, for example four-flipper games or locations with 110-115 V at the wall.

Systems

• WPC-95

Related tips

• What a WPC game reset is
• Resets: +5 V at the driver board test point is low
• Game reboots the instant the second visor lock is made in later multiballs
• Finding a board or device that drags the +5 V down
• Watching the supplies while the game resets
• Resets continue although the bridge and diodes test good
• Resets or dead banks of coils or lamps from cracked bridge or cap solder
• Replace the +5 V filter capacitor on any game ten years or older

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