Checking the coil supply at TP6

TP6 has no LED. It should read 50 to 70 V DC to ground (TP5) with the coin door closed. The supply comes from J102 pins 5-6 and 8-9 through F112, BR3 and C8, then the coil fuses F101 to F105 to J106, J107, J108 and J109.

Systems

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

Related tips

• Coil-not-working checklist
• Grounding test for WPC coils 1-8
• No 50 V coils work
• One coil will not fire
• Firing each coil from the WPC solenoid test
• Why WPC coil diodes are on the driver board
• The four groups of WPC coil outputs
• One coil does nothing in the solenoid test

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