Testing a diode with a digital meter
Steps
- Turn the game off.
- Set the meter to the diode range.
- Red lead on the anode, black on the banded cathode: you should get a reading (about 0.6 on the meter); no reading means the diode is open.
- Reverse the leads: there should be no reading; any reading means it is shorted or leaky.
Systems
- Williams System 3
- Williams System 4
- Williams System 6 / 6A
- Williams System 7
- Williams System 9
- Williams System 11
- Williams System 11A
- Williams System 11B
- Williams System 11C
- WPC Alpha-Numeric
- WPC Dot Matrix
- WPC Fliptronics
- WPC DCS
- WPC-Security (WPC-S)
- WPC-95
- Bally MPU AS-2518-17
- Bally MPU AS-2518-35
- Stern MPU-100
- Stern MPU-200
- Bally 6803
- Gottlieb System 1
- Gottlieb System 80
- Gottlieb System 80A
- Gottlieb System 80B
- Gottlieb System 3
- Data East CPU Version 1/2
- Data East CPU Version 3
- Data East/Sega CPU Version 3b
- Capcom
- Electro-mechanical
Source: Pinball Machines: How They Work & Troubleshooting, Norbert Snicer