Electric Chair Yellow
Matrix column 6, row 4 ·
Wiring
- Column 6
- Yellow-Blue J137-6 · Q93
- Row 4
- Red-Yellow J133-5 · Q87
Parts
- Installed LED 555 Yellow Frosted
- Bulb #555 24-8768
Location
Service log
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Service notes: In the lamp matrix at column 6 (driver Q93, J137-6) 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 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