System 11 CPU board connectors
1J1, 1J2 display digit strobes; 1J3 display BCD; 1J4 lamp matrix +18 V; 1J5 lamp ground; 1J6 lamp rows; 1J7 lamp columns; 1J8 switch columns; 1J9 opto switch columns (System 11 only); 1J10 switch rows; 1J11 solenoids 1 to 8 (drivers Q22 to Q25 and Q30 to Q33); 1J12 solenoids 9 to 16 (drivers Q6 to Q9 and Q14 to Q17); 1J13 solenoid ground; 1J14 coin door diagnostic switches; 1J15 speakers (11 and 11A); 1J16 volume (11, 11A, 11B); 1J17 CPU power; 1J18 special solenoid switches (not used from Big Guns); 1J19 special solenoids 1-6; 1J21 audio board ribbon; 1J22 master display ribbon.
Systems
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Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)