Right Trough
Matrix column 1, row 7 ·
Wiring
- Column 1
- Green-Brown J206-1 · U20-18
- Row 7
- White-Violet J208-8 · U19-5
Parts
- Switch 5647-12693-08
- Assembly A-11680
Location
Owner's hint
Trough switch. If the game loses count of balls, check these first. (owner's experience, not the manual)
Service log
Everything you record stays on this device.
Service notes: In the switch matrix at column 1 (J206-1, U20-18) and row 7 (J208-8, U19-5). 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