Games with under-playfield 2N5875 driver transistors

Some games drive extra 24 V coils through a 2N5875 mounted under the playfield, pre-driven by a 6 V lamp transistor. Joker Poker has one ("K" target bank reset), Roller Disco one (left target bank), Close Encounters one (roto-target), Count-Down two (blue and yellow target resets), Hulk two ("A" and "B" shooters) and Torch two (left blue and right green target resets).

Systems

• Gottlieb System 1

Games

• Joker Poker
• Roller Disco
• The Incredible Hulk
• Torch

Related tips

• Testing an under-playfield 2N5875 and its wiring
• Kings drop bank never resets: under-playfield transistor wired wrong
• Torch: under-playfield coil transistor
• Roller Disco: under-playfield coil transistor
• The Incredible Hulk: under-playfield coil transistor
• Coils or driver transistors run very hot
• Coils lock on from a playfield ground pin
• A shorted coil means replacing its whole driver path

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