*Thing* "I"
Matrix column 8, row 4 · speaker panel ·
Wiring
- Column 8
- Yellow-Grey J138-9 · Q91
- Row 4
- Red-Yellow J133-5 · Q87
Parts
Location
Related
Service log
Everything you record stays on this device.
Service notes: In the lamp matrix at column 8 (driver Q91, J138-9) and row 4 (driver Q87, J133-5). One dark lamp is the #555 bulb (24-8768) or its socket; a whole column or row dark is the driver transistor or the J138/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