Typical causes of each blown fuse (WPC-89 and WPC-S)

Line fuse: shorted BR3 or Fliptronics bridge, or a shorted varistor in the power box. F101-F102: on pre-Fliptronics games a faulty EOS switch or shorted flipper coil; otherwise a shorted coil or driver. F103-F105: shorted coil or driver. F106-F110: shorted GI socket. F111: BR4 or a flasher socket. F112: BR3. F113: BR2 or +5 V short. F114: BR1, C6/C7 or a lamp socket. F115: CPU U20, maybe U14. F116: BR5 or a shorted 12 V device, including some displays.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)

Related tips

• WPC-89/WPC-S driver board fuse ratings
• WPC power driver board fuses and what they feed
• Which fault blows which driver board fuse (WPC-89/WPC-S)
• 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
• WPC: fuse holder snaps off the power driver board: replace the clips properly
• Fuse-failure message at boot but the fuses are good

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