Lincoln Electric SVM157-A service manual Volts 20.0

Models: SVM157-A

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F-26

TROUBLESHOOTING AND REPAIR

F-26

ABNORMAL OPEN CIRCUIT VOLTAGE

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

0 Volts

20.0 V

5 ms

SCOPE SETTINGS

This is NOT a typical DC output voltage

 

 

 

waveform. The output

capacitors

are

 

Volts/Div

20V/Div

not functioning. Note the lack of “filter

-

 

 

ing” in the output waveform. The output

 

Horizontal Sweep

5 ms/Div

capacitor bank was disconnected. Each

 

 

 

vertical division represents 20 volts and

 

Coupling

DC

each horizontal division represents 5

 

 

 

milliseconds in time.

 

 

 

Trigger

Internal

NOTE: Scope probes

connected

at

 

 

 

machine output

terminals: (+)

 

 

 

probe to electrode, (-) probe to

 

 

 

work.

 

 

 

 

 

 

 

 

 

 

 

POWER MIG 200

Page 60
Image 60
Lincoln Electric SVM157-A service manual Volts 20.0