Test a 2N5060 lamp matrix SCR with a meter
Steps
- Meter on diode test.
- Red lead on the middle leg.
- Black lead on the right leg: expect about 0.5 to 0.7 V.
- Black lead on the left leg: expect about 0.9 to 1.1 V.
Systems
Related tips
- Lamp driver SCRs on the CPU board
- Lamp driver board layout: SCRs, decoders and connectors
- Lamp and switch matrix transistor positions on the CPU board
- Lamp driver SCR blew apart with a crack
- Lamp row still dead after a new TIP122
- Lamp matrix still wrong after replacing transistors: upstream parts
- Test a TIP42 lamp column transistor with a meter
- An LED stays dark on a lamp header during the test
Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Two, Clay Harrell (pinrepair.com)