Not Used
Matrix column 4, row 1 · not used ·
Wiring
- Column 4
- Yellow-Black J137-4 · Q95
- Row 1
- Red-Brown J133-1 · Q90
Location
- Not on the playfield map: not used in this machine.
- No callout on the location map
Service log
Everything you record stays on this device.
Service notes: In the lamp matrix at column 4 (driver Q95, J137-4) and row 1 (driver Q90, J133-1). One dark lamp is the bulb 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