Roller Disco: under-playfield coil transistor
On Roller Disco, one 2N5875 under the playfield fires the left target bank reset. They are pre-driven from driver board Q3 or Q4, so a dead or locked-on coil there may be the playfield transistor, the MPS-U45 or the wiring between them.
Systems
Games
Related tips
- Torch: under-playfield coil transistor
- Testing an under-playfield 2N5875 and its wiring
- Roller Disco: game PROM letter
- Game over relay won't hold in: poor 5 V pin from the CPU to the driver board
- Which driver transistor fires which coil
- Games with under-playfield 2N5875 driver transistors
- Coils or driver transistors run very hot
- Spare transistors for System 1 boards
Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)