Jackpot (2)
Matrix column 1, row 3 ·
Wiring
- Column 1
- Yellow-Brown J137-1 · Q98
- Row 3
- Red-Orange J133-4 · Q88
Parts
Location
Related
Service log
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Service notes: In the lamp matrix at column 1 (driver Q98, J137-1) and row 3 (driver Q88, J133-4). One dark lamp is the #555 bulb (24-8768) or its socket; a whole column or row dark is the driver transistor or the J137/J133 connector, not the bulbs. Find it in T.8 Single Lamp Test. With LEDs, a faint glow on lamps that should be off is matrix ghosting: the ghost-busting ROM for this game or non-ghosting LEDs. A4 Lamps, flashers and GI
Appendices:A4 Lamps, flashers and GIA5 Power driver boardA1 Multimeter basics