Proving the driver board's switch strobes
Steps
- Put the game in switch test.
- Unplug A3P3 at the upper left of the driver board.
- Clip a test lead to the header pin of the strobe in question.
- Touch the other end to any pin of the column header A3P5 at the lower left.
- A switch closure should show; if it does, the driver board is good and the fault is in the wiring or A17 board.
Systems
Related tips
- Lamp and switch matrix size and drivers
- What the A3 driver board drives
- Spare MosFETs for the driver boards
- Bottom cabinet relays and their drivers
- Only logic-level (L) MosFETs work on the driver board
- Diode-testing the 12P06 strobe MosFETs
- Logic chips worth stocking
- Flippers dead in a game
Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)