The game still resets, yet the bridge or rectifier diodes pass the meter tests.

Resets continue although the bridge and diodes test good

Cause: Bridges and diodes can become leaky and only fail under load; aging filter capacitors; finally the LM339 comparator in the zero-cross circuit.

Checks

• Confirm the wall voltage is correct.

Fix

• Reflow the solder on the bridge or diodes and their filter capacitor.
• Replace the suspect 5 V rectifier anyway: BR2, or D7-D10 on WPC-95.
• On a game ten or more years old replace C5 and C4 (C9 and C1 on WPC-95) as well.
• As a last resort replace the LM339 at U6 (U1 on WPC-95), in a socket.

Systems

• WPC Alpha-Numeric
• WPC Dot Matrix
• WPC Fliptronics
• WPC DCS
• WPC-Security (WPC-S)
• WPC-95

Related tips

• Resets remain after rectifiers, caps and connectors are done
• GI strings won't dim in the GI test
• Lamp matrix faults with all lamp transistors good
• "Check Fuse F114/F115" (F106/F101 on WPC-95): step-by-step
• Fliptronics and WPC-95: weak flipper
• Row or column "ground short" errors
• Optos test good but still don't work: the opto board
• Groups of switches dead or intermittent: loose surface-mount LM339s

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