System 80 driver board transistor types

The driver board mixes MPS-U45 and MPS-A13 transistors on the lamp and relay outputs. Q53, Q59 and Q60 are 2N6043 coil drivers. The bigger coils use a pair, an MPS-U45 pre-driver with a 2N3055: Q57/Q58, Q61/Q62 and Q63/Q64. Q1 drives the game over relay "Q", Q2 the tilt relay "T" and Q3 the coin lockout coil; Q54-Q56 drive the optional coin meters (solenoids 3, 4 and 7) and Q53 the knocker (solenoid 8).

Systems

• Gottlieb System 80

Games

• Black Hole
• Haunted House

Related tips

• How driver board coil transistors are switched
• Optional ground mod step 1: ground the 2N3055 cases on the driver board
• A CPU-controlled lamp or coil stays on
• Haunted House: no sound 16 in the sound test
• Flippers dead during play: check the "U" relay
• Haunted House trap door won't open
• What the System 80 driver board transistors drive
• Backbox chase lights not running

Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part Two, Clay Harrell (pinrepair.com)