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TROUBLESHOOTING & REPAIR
F-47 F-47
IDEALARC DC-655
This is the typical DC open circuit voltage wave-
form. The machine was in an open circuit con-
dition (no load) and operating properly. Note
that each vertical division represents 2 volts and
that each horizontal division represents 5 milli-
seconds in time.
Note: Scope probes connected at SCR gate
and cathode: (+) probe to gate, (-) probe to
cathode.
SCOPE SETTINGS
Volts/Div.......................2V/Div.
Horizontal Sweep.....5 ms/Div.
Coupling ............................DC
Trigger.........................Internal
TYPICAL SCR GATE VOLTAGE WAVEFORM
CONSTANT VOLTAGE MIG
MAXIMUM OUTPUT SETTING – NO LOAD
0 volts
5 ms
2 volts