WPC: replace the leak-prone radial 100 uF caps on opto boards and power driver C2
On WPC games the small radial 100 uF capacitors have become prone to leaking, and the electrolyte can ruin the board around them. Members who repair many of these boards named C2 on the power driver board and the radial 100 uF cap on the under-playfield opto boards (the 10-opto and 16-opto boards, for example) as the usual leakers, and other small boards under the playfield such as the trough and motor boards carry similar caps. Replacing them as preventive maintenance is cheap; the axial 100 uF cap on the 7-opto board and the C8 150 V cap in the coil supply were not seen as leak risks. Always fit a replacement with at least the original voltage rating.
Unplug the game before pulling the power driver board: its large filter capacitors can hold a charge. A capacitor with too low a voltage rating can burst violently at power on.
Systems
Related tips
- Voltages made by the WPC power driver board
- WPC power driver board fuses and what they feed
- Supplies made on the WPC power driver board
- WPC power driver bridge rectifiers and +5 V regulator
- WPC power driver board versions and where they fit
- Driver board LED4 off and the game won't boot (WPC-S and earlier)
- Driver board LED7 off (+12 V unregulated)
- Driver board LED1 off: switch matrix 12 V missing (WPC-S and earlier)
Source: Pinball Repair help group!! (Facebook group)