Testing a WPC-95 rectifier diode
Steps
- Meter on diode test; in-circuit readings may differ from these.
- Black lead on the banded end, red lead on the other end: expect 0.4-0.6.
- This only finds a shorted diode. A diode that passes can still be leaky and cause resets.
Systems
Related tips
- WPC-95 rectifier diodes, filter caps and fuses by supply
- Replacement bridge rectifier and diode ratings
- WPC-95 uses discrete P600D diodes instead of bridges
- WPC-95 LED101 off (+5 V, game will not boot)
- WPC-95 driver board LEDs and test points
- Filter capacitors and GI triacs that fit WPC boards
- Supplies made on the WPC power driver board
- WPC-95 LED100 off (+12 V regulated)
Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Two, Clay Harrell (pinrepair.com)