Typical causes of each blown fuse (WPC-95)

Line fuse: a shorted diode among D19-D22, a shorted power-box varistor, or a bridge on the A/V board. F101: CPU U20, maybe U23. F102-F104: shorted coil or driver. F105: D7-D10 or +5 V short. F106: D11-D14 or a lamp socket. F107: D15-D18 or a flasher socket. F108: D19-D22. F109: D3-D6 or a shorted 12 V device. F110-F114: shorted GI socket. F115-F118: shorted or miswired flipper coil.

Systems

• WPC-95

Related tips

• WPC-95 driver board fuse ratings
• Switch matrix fuse F115 (F101 on WPC-95) blows as soon as it is replaced
• "Check Fuses F114/F115" (F106/F101 on WPC-95) message
• "Check Fuse F114/F115" (F106/F101 on WPC-95): step-by-step
• Fuse-failure message at boot but the fuses are good
• F103 blows instantly: shorted ramp diverter coil; magnet fires the diverter if F104 open
• A coil keeps firing at power-on and the DMD is blank
• WPC-95 rectifier diodes, filter caps and fuses by supply

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