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TROUBLESHOOTING & REPAIR
F-34
F-34
WELDANPOWER 125
CH1
0 volts
5 ms
50 volts
This is not the typical DC output
voltage waveform. Note the “gap” in
the waveform. One output diode was
disconnected to simulate an “open”
diode. Each vertical division repre-
sents 50 volts and that each horizon-
tal division represents 5 milliseconds
in time.
Note: Scope probes connected at
machine output terminals.
SCOPE SETTINGS
Volts/Div.....................50V/Div.
Horizontal Sweep.....5 ms/Div.
Coupling ............................DC
Trigger .........................Internal
ABNORMAL OPEN CIRCUIT WELD VOLTAGE WAVEFORM
HIGH IDLE – NO LOAD – OUTPUT CONTROL AT MAXIMUM
