J115 wire colors on games before Twilight Zone

Early games with the white J115 plug use only two colors from the transformer: solid yellow (GI supply) on pins 2 to 6, and yellow with white (GI return) on pins 1, 7, 8, 10, 11 and 12. Pin 9 is the key.

Systems

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

Related tips

• Two wires on one GI pin
• Why the early white J115 plug overheats
• Thin wire on J120 adds to burning on WPC-S
• Coils pulse and backbox flashers too bright: flasher power wire on J132
• Lower pop locks on at power-up: J124 plug fitted on J128
• DMD shows a few dots and a coil fuse blows after reseating boards: ribbon off one row
• Backbox wheel and Ferris wheel motors dead with no 12 V: J116 left unplugged
• After playfield work: optos, crane and Deadworld dead, trough dumps balls (J116)

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