J115 GI input pin map (WPC-89/WPC-S driver board)

Pin 1 is the bottom pin. 1 ground; 2 F106 (lower left fuse); 3 F110 (lower right); 4 F109 (upper right); 5 F107 (middle left); 6 F108 (upper left); 7 triac Q10 (lower right); 8 triac Q18 (upper right); 9 key; 10 triac Q16 (lower middle); 11 triac Q14 (upper middle); 12 triac Q12 (left). Remove J115 before measuring or readings will be wrong.

Systems

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

Related tips

• WPC lamp matrix and GI driver parts
• Test GI outputs on the driver board
• How the WPC lamp matrix works
• Testing lamp-row drivers with a test lamp
• Testing lamp-column drivers with a test lamp
• One GI string dead after a restoration: unkeyed J115 plugged in upside down
• GI string dead after connector replacement: broken traces
• The three WPC lamp circuits

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