Swamp Lock Center
Matrix column 7, row 2 · under the playfield ·
Wiring
- Column 7
- Green-Violet J206-7 · U20-12
- Row 2
- White-Red J208-2 · U18-9
Parts
- Switch 5647-12693-25
- Assembly A-14964
Location
Owner's hint
Microswitch with an actuator arm. Check that the ball pushes the arm all the way down. (owner's experience, not the manual)
Related
Service log
Everything you record stays on this device.
Service notes: In the switch matrix at column 7 (J206-7, U20-12) and row 2 (J208-2, U18-9). Gap 1/16 inch; clean by pulling card stock through the closed contacts, never a file. One switch that fails T.1 is its gap, the wire at the lug or its diode; a shorted diode makes the whole column or row misread. A whole column dead is U20 or the J206 pin, a whole row is the row comparator. A3 Switches and optos
Appendices:A3 Switches and optosA5 Power driver boardA1 Multimeter basics