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TROUBLESHOOTING & REPAIR | ||
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ABNORMAL OPEN CIRCUIT VOLTAGE WAVEFORM
CONSTANT VOLTAGE INNERSHIELD
ONE OUTPUT SCR NOT FUNCTIONING
MAXIMUM OUTPUT SETTING
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This is NOT the typical DC output volt- age waveform. One output SCR is not functioning. Note the “gap” in the wave- form. One SCR gate is disconnected to simulate an open or nonfunctioning out- put SCR. Each vertical division repre- sents 50 volts and each horizontal divi- sion represents 2 milliseconds in time.
Note: Scope probes connected at
machine ouput terminals: (+) probe to positive 1000 amp terminal,
SCOPE SETTINGS
Volts/Div. . . . . . . . . . . . . 50 V/Div. Horizontal Sweep . . . . . 2 ms/Div. Coupling . . . . . . . . . . . . . . . . . DC Trigger . . . . . . . . . . . . . . . Internal
