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This is NOT a typical DC output volt-
age waveform. One output diode is
not functioning. Note the increased
ripple content. One diode was discon-
nected to simulate an open or non-
functioning output diode. Each vertical
division represents 20 volts and each
horizontal division represents 5 mil-
liseconds in time. The machine was
loaded with a resistance grid bank.
Note: Scope probes connected at
machine output terminals: (+)
probe to electrode, (-) probe to
work.
ABNORMAL OUTPUT VOLTAGE WAVEFORM - MACHINE LOADED
(MAX TAP “G”)
ONE OUTPUT DIODE NOT FUNCTIONING
0 volts
5ms
20.0 V
TROUBLESHOOTING AND REPAIR
F-25 F-25
Power MIG® 215XT
SCOPE SETTINGS
Volts/Div.....................20V/Div.
Horizontal Sweep.....5 ms/Div.
Coupling.............................DC
Trigger.........................Internal
MACHINE LOADED TO 180 AMPS AT 16 VDC
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