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| TROUBLESHOOTING AND REPAIR | |||
Troubleshooting Guide – See Wiring Diagrams for location of specified | Observe Safety Guidelines | |||
components. See Wiring Diagrams for troubleshooting of specific circuits. | detailed in the beginning of this manual. | |||
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PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED | |
(SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION | |
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FUNCTIONAL PROBLEMS (Continued)
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When the gun trigger is pulled there is no wire feed, but gas flows and arc voltage is present.
1.Check to see if the motor drive rolls are turning when the gun trigger is pulled. If the drive rolls are turning then check for clogged gun liner or a mechanical restriction in the wire feeding path.
2.If the drive rolls do not turn when the gun trigger is pulled then contact your Local Lincoln Authorized Field Service Shop.
1.With the trigger activated check for the presence of drive motor armature voltage. 5 to 95 VDC at leads #539 to #541.
Note: The armature voltage will be dependent on the wire speed setting.
2.If the correct armature voltage IS present at leads #539 and #541 and the drive motor is NOT turning, then the drive motor may be defective. Also check the brushes in the drive motor; replace if less than 1/4 in. in length.
3.If the correct armature voltage is NOT present at leads #539 and #541 then the CR1 control relay may be defective. Replace per Control Relay Replacement procedure.
4.If the armature voltage is not restored then the control PC board may be defective. Replace
per Control PC Board Replacement procedure.
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call
