Diode-testing the 12N10L/IRL530 MosFETs
Steps
- Applies to solenoid/flasher MosFETs Q1-Q32, lamp return MosFETs Q45-Q52 and the aux driver board.
- Power off; ideally remove the board, otherwise unplug P5 and P6.
- Meter on diode range, component side up. Black lead on the metal tab or centre leg.
- Red lead on the lower leg (nearest P5/P6/P7): expect 0.4 to 0.6. About 0.2 to 0.3 means replace it.
- Red lead on the upper leg: expect no reading (open). About 0.2 to 0.3 means replace it.
- A meter catches roughly 95 percent of bad parts, so replace anything doubtful.
Systems
Related tips
- Diode-testing the 12P06 strobe MosFETs
- Spare MosFETs for the driver boards
- Coil MosFET ratings and substitutes
- What the A3 driver board drives
- The A11 auxiliary driver board
- Cue Ball Wizard: coils holding on weakly (BUZ72L MosFETs)
- Logic chips worth stocking
- Lamp and switch matrix size and drivers
Source: Repairing Gottlieb System 3 Electronic Pinball Games from 1989 to 1996, Clay Harrell (pinrepair.com)