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F-65 F-65
TROUBLESHOOTING & REPAIR
SQUARE WAVE TIG 355
CH1
0 volts
2 ms
50 volts
SCOPE SETTINGS
Volts/Div.....................50V/Div.
Horizontal Sweep.....2 ms/Div.
Coupling ............................DC
Trigger .........................Internal
This is NOT the typical AC output
voltage waveform. One output SCR
is not functioning. Note the “gap” in
the waveform. One SCR gate was
disconnected to simulate an open or
non-functioning output SCR. Each
vertical division represents 50 volts
and each horizontal division repre-
sents 2 milliseconds in time.
Note: Scope probes connected at
machine output terminals: (+) probe
to electrode terminal, (-) probe to
work terminal.
ABNORMAL OPEN CIRCUIT VOLTAGE – AC TIG MODE
ONE OUTPUT SCR NOT FUNCTIONING
HIGH VOLTAGE / HIGH FREQUENCY can damage test equipment.
• Perform all voltage and waveform checks with high frequency circuit OFF.
CAUTION