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0 v 5 ms 0 volts, Troubleshooting and repair – Lincoln Electric POWER MIG SVM157-A User Manual

Page 60

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TROUBLESHOOTING AND REPAIR

F-26

F-26

POWER MIG 200

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ABNORMAL OPEN CIRCUIT VOLTAGE

OUTPUT CAPACITOR BANK NOT FUNCTIONING (MAX TAP “G”)

20.0 V

5 ms

0 Volts

This is NOT a typical DC output voltage
waveform. The output capacitors are
not functioning. Note the lack of “filter-
ing” in the output waveform. The output
capacitor bank was disconnected. Each
vertical division represents 20 volts and
each horizontal division represents 5
milliseconds in time.

NOTE: Scope probes connected at

machine output terminals: (+)
probe to electrode, (-) probe to
work.

Volts/Div.................................20V/Div

Horizontal Sweep.................5 ms/Div

Coupling........................................DC

Trigger....................................Internal

SCOPE SETTINGS