E-4

 

TROUBLESHOOTING

 

 

 

E-4

 

 

 

Observe Safety Guidelines detailed in the beginning of this manual.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROBLEMS

 

POSSIBLE

RECOMMENDED

 

 

(SYMPTOMS)

 

 

 

CAUSE

 

 

COURSE OF ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WELDING PROBLEMS

 

 

 

 

 

 

 

Arc is unstable Poor starting

 

 

 

1. Check for correct input voltage

 

 

 

 

 

 

 

 

 

 

 

 

 

to machine 208 or 230 VAC.

 

 

 

 

 

 

 

 

 

 

 

 

2.

Check for proper electrode

 

 

 

 

 

 

 

 

 

 

 

 

 

polarity for process.

 

 

 

 

 

 

 

 

 

 

 

 

3.

Check gun tip for wear or dam-

 

 

Contact your local Lincoln

 

 

 

 

 

 

 

 

 

age Replace.

 

 

Authorized Field Service Facility.

 

 

 

 

 

 

 

 

4.

Check for proper gas and flow

 

 

 

 

 

 

 

 

 

 

 

 

 

rate for process.

 

 

 

 

 

 

 

 

 

 

 

 

5.

Check work cable for loose or

 

 

 

 

 

 

 

 

 

 

 

 

 

faulty connections.

 

 

 

 

 

 

 

 

 

 

 

 

6.

Check gun for damage or

 

 

 

 

 

 

 

 

 

 

 

 

 

breaks.

 

 

 

 

 

 

 

 

 

 

 

 

7.

Check wire feed to assure

 

 

 

 

 

 

 

 

 

 

 

 

 

smooth wire feeding (check

 

 

 

 

 

 

 

 

 

 

 

 

 

brake adjustment).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CAUTION

If for any reason you do not understand the test procedures or are unable to Perform the tests/repairs safely, contact your LOCAL AUTHORIZED LINCOLN ELECTRIC FIELD SERVICE FACILITY for assistance before you proceed.

SP-175 PLUS

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Lincoln Electric IM790 manual Welding Problems