Diode-test a driver board 2N6043
Steps
- These are Q53, Q59 and Q60 and test the same in or out of circuit.
- Meter on diode test, black lead on the center leg, red on each outer leg in turn.
- Each should read 0.4 to 0.6; anything else means replace it.
Systems
Related tips
- Diode-test the driver board MPS-U45 and MPS-A13 transistors
- Test the driver transistors while the board is out for the ground mod
- What the System 80 driver board transistors drive
- System 80 driver board transistor types
- One driver board fits every System 80, 80A and 80B game
- Relay and coin counter transistors on the driver board
- Some 80B driver boards use the coin counter transistors
- Test driver board outputs by grounding transistor tabs
Source: Repairing & Upgrading Gottlieb System 80 Pinballs from 1980 to 1989, Part One, Clay Harrell (pinrepair.com)