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| TROUBLESHOOTING & REPAIR | ||||
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| Observe all Safety Guidelines detailed throughout this manual |
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| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION |
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OUTPUT PROBLEMS
Machine input contactor operates but machine has no weld output. Fan runs and pilot light glows.
1.Install a jumper from #2 to #4 on machine terminal strip. If machine weld output is restored, the problem is in the wire feeder or control cable.
2.If remote control is not being used, make certain the output control switch (SW3) is in the
“OUTPUT CONTROL AT DC 1000” position.
3.Check 8 AMP fuse in the front panel. Replace if blown.
4.Check for loose or faulty weld cable connections.
1.Check operation of output pilot relay (4CR). There should be 115 VAC present on leads #31 and #4 at (4CR) when #2 and #4 are jumpered together at the terminal strip.
a.If the correct voltage is pre- sent and the relay does not activate, the relay may be faulty - Replace.
b.If the 115 VAC is missing, check the associated wiring for loose or faulty connec- tions. See wiring diagram.
2.Check the output control potentiometer (R1) and asso- ciated circuitry for loose or faulty connections. See wiring diagram.
3.Perform Main Transformer
Test
4.Perform Firing Board Test.
5.Perform Control Board Test.
6.Perform SCR Output Bridge Test.
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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