Lamp driver board: which SCR drives which connector pin
SCRs Q1-Q15 go to J1-24, J1-25, J1-26 and J2-21, J1-28, J2-16, J2-14, J1-27 and J2-13, J1-23, J1-14, J1-15, J1-16, J1-19, J1-17, J1-18, J2-23. Q16-Q30 go to J2-22, J1-11, J2-20, J2-15, J1-13, J1-12 and J2-12, J1-10, J1-4 and J2-8, J1-5, J1-6, J1-7, J1-9, J1-8, J1-1, J2-6. Q31-Q45 go to J2-2, J3-27, J2-11, J1-2, J1-3, J3-26, J3-23, J3-25, J2-4 and J3-24, J2-9 and J3-22, J3-20, J3-21, J2-7, J3-19, J2-1. Q46-Q60 go to J3-18, J2-10, J3-16, J3-17, J3-12, J3-15, J2-5 and J3-13, J2-3 and J3-14, J3-11, J3-9, J3-10, J3-1, J3-2, J3-4, J3-3.
Systems
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Source: Repairing Bally Electronic Pinball Games from 1977 to 1985, Part Three, Clay Harrell (pinrepair.com)