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PRECISION TIG 185
TROUBLESHOOTING & REPAIR
F-37 F-37
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ABNORMAL OPEN CIRCUIT VOLTAGE - DC TIG 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.
• Perform High Frequency Disable Procedure.
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50 V
2 ms
0 V
This is NOT the typical DC (+) 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 non-functioning output SCR. Note
that each vertical division represents 50
volts and that each horizontal division repre-
sents 2 milliseconds in time.
Note: Scope probes connected at machine
output terminals: (+) probe to electrode, (–)
probe to work.
Volts/Div. ...............................50 V/Div.
Horizontal Sweep .................2 ms/Div.
Coupling.........................................DC
Trigger .....................................Internal
SCOPE SETTINGS