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| TROUBLESHOOTING & REPAIR | ||||
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| Observe all Safety Guidelines detailed througout 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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FUNCTION PROBLEMS
The weld output terminals are always electrically “hot”.
1.Remove any external leads hooked to #2 and #4 on the terminal strip. If the problem disappears, the fault is in the control cable or wire feeder.
2.If some open circuit voltage is present (over 3 VDC.) after performing Step #1, then the problem is within the DC- 1000.
1.Check for an internal short between leads #2 and #4. See wiring diagram.
2.The Pilot Relay (4CR) may be stuck closed. Check or replace.
3.Perform Firing Board Test.
4.Perform Control Board Test.
5.Perform the SCR Output Bridge Test.
6.The SCR Snubber(s) may be “leaky”. Check or replace. See wiring diagram.
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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