Rectifier board J3 (to backbox boards) pins
J3-1, 2: GI return. J3-3, 4: lamp return to lamp driver J4-2, J4-1. J3-5: +230 V to SDB J3-6 (190 V regulator). J3-6: +5.4 V lamp supply. J3-7: key. J3-8: +11.9 V to SDB J3-12 (5 V regulator). J3-9: +43 V to the flipper relay K1 via SDB J3-5 (via sound board J1-9 from Lost World on). J3-10, 11: GI supply. J3-12: +43 V zero-crossing to MPU J4-15. J3-13: +43 V solenoid supply. J3-14: lamp return to lamp driver J4-11. J3-15, 17: 5 V regulator ground to SDB J3-21, J3-10. J3-16, 18: 190 V regulator ground to SDB J3-22, J3-3. J3-19, 20: solenoid ground to SDB J3-23, J3-24.
J3-5 carries about 230 V DC.
Systems
Related tips
- Rectifier board J1 (to playfield) pins
- 12 V at the rectifier board but not at the MPU
- Burnt pins at solenoid driver J3
- Flickering displays and flipper drop-outs from a poor backbox ground
- MPU gives 3 flashes after reassembly: two 15-pin plugs swapped
- Three flashes and 8s or 9s in the hundreds digit
- Knocker fires instead of the outhole kicker: bad solenoid driver J4 connector
- Drop targets score but no longer light features: cracked switch matrix connector
Source: Voltage Test Points on the Boards