Joker Poker: under-playfield coil transistor

On Joker Poker, one 2N5875 under the playfield fires the "K" 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

• Gottlieb System 1

Games

• Joker Poker

Related tips

• Torch: under-playfield coil transistor
• The Incredible Hulk: under-playfield coil transistor
• Testing an under-playfield 2N5875 and its wiring
• Joker Poker: game PROM letter
• Which driver transistor fires which coil
• Coils or driver transistors run very hot
• Spare transistors for System 1 boards
• Testing the 2N6043 coil drivers

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)