Grounding test for WPC coils 1-8

On the high-power outputs (coils 1-8) grounding the TIP36C tab does nothing useful. Ground the coil wire at the power driver connector, or ground the tab of the TIP102 pre-driver instead.

Systems

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

Related tips

• Firing each coil from the WPC solenoid test
• Why WPC coil diodes are on the driver board
• The four groups of WPC coil outputs
• WPC coils need no diode except the flippers
• Coil-not-working checklist
• No 50 V coils work
• Checking the coil supply at TP6
• WPC solenoid driver groups

Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer