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TROUBLESHOOTING & REPAIR |
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ABNORMAL OPEN CIRCUIT VOLTAGE - AC STICK MODE
ONE OUTPUT SCR NOT FUNCTIONING
CAUTION
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
•Perform all voltage and waveform checks with high frequency circuit OFF.
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CH1
0 volts
50 volts | 2ms |
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This is NOT the typical AC output voltage waveform. One output SCR is not function- ing. Note the “gap” in the waveform. One SCR gate was disconnected to simulate an open or
Note: Scope probes connected at machine
output studs: (+) probe to electrode,
SCOPE SETTINGS
Volts/Div | 50 V/Div. |
Horizontal Sweep | 2 ms/Div. |
Coupling | DC |
Trigger | Internal |
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