Lincoln Electric SVM144-B service manual Troubleshooting & Repair

Models: SVM144-B

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F-34

TROUBLESHOOTING & REPAIR

F-34

ABNORMAL OPEN CIRCUIT VOLTAGE

OUTPUT CAPACITOR BANK NOT FUNCTIONING

0 VOLTS

20.0 V

5 ms

 

SCOPE SETTINGS

 

 

 

 

This is NOT the typical DC output voltage

 

 

waveform. The output capacitors are not

Volts/Div

20 V/Div

functioning. Note the lack of “filtering” in the

 

 

output waveform. The output capacitor bank

Horizontal Sweep

5 ms/Div

was disconnected. Each vertical division

 

 

represents 20 volts and each horizontal divi-

Coupling

. . . . DC

sion represents 5 milliseconds in time.

 

 

NOTE: Scope probes connected at machine

Trigger

. Internal

 

 

output terminals: (+) probe to electrode, (-)

 

 

probe to work.

 

 

 

 

 

POWER MIG 255

Page 72
Image 72
Lincoln Electric SVM144-B service manual Troubleshooting & Repair