Electric Chair Red
Matrix column 4, row 7 ·
Wiring
- Column 4
- Yellow-Black J137-4 · Q95
- Row 7
- Red-Violet J133-8 · Q84
Parts
- Installed LED 555 Red Frosted
- Bulb #555 24-8768
Location
Service log
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Service notes: In the lamp matrix at column 4 (driver Q95, J137-4) and row 7 (driver Q84, J133-8). 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