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TROUBLESHOOTING & REPAIR |
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| TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | |||||||
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| detailed in the beginning of this manual. | ||
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| PROBLEMS |
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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| Major physical or electrical damage |
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| Contact your LOCAL LINCOLN |
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| Contact the Lincoln Electric Service |
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| AUTHORIZED FIELD SERVICE |
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| Department. (216) |
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| FACILITY. |
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| No wire feed, weld output or gas |
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| 1. Make sure correct voltage is |
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| 1. Check for 115 VAC at input to |
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| flow when gun trigger is pulled. Fan |
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| applied to the machine (115 |
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| fan motor (leads #31 to #32). If |
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| does NOT operate. |
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| vac). |
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| correct voltage is present and fan |
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| motor does not function, replace |
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| 2. Make certain that power switch |
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| the fan motor. See wiring dia- |
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| gram. |
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| is in the ON position. |
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| 2. If 115 vac is not present at leads |
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| #31 to #32, then check the power |
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| switch and input line cord. (SI) |
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| No weld output or wire feed when |
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| Contact your LOCAL LINCOLN |
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| 1. Check voltage from leads #202 |
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| gun trigger is pulled. Fan runs and |
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| AUTHORIZED FIELD SERVICE |
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| to #201 at the output diode heat |
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| gas flows normally. |
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| FACILITY. |
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| sinks. Normal voltage is from 2 |
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| vac to 20 VAC, depending on arc |
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| voltage control setting. If the cor- |
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| rect AC voltage is present, check |
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| the output diodes and connec- |
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| tions. Also check the output ca- |
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| pacitor, C1. See wiring diagram. |
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| 2. If the correct AC voltage is not |
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| present at the diode heat sink |
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| leads #202 to #201, then check |
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| the AC voltage on the trans- |
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| former (TI) primary leads #531 to |
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| #32 (normal is 115 vac with arc |
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| voltage control at maximum). If |
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| the correct voltage is present at |
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| the transformer primaries (#531 |
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| to #32), the transformer may be |
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| faulty. See wiring diagram. |
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| 3. If the correct voltage is not pre- |
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| sent at leads #531 to #32, then |
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| check the arc voltage control |
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| potentiometer (RI)and associated |
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| wires #205, #206 and #207 for |
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| loose or broken connections. |
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| See wiring diagram. |
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| 4. The control board may be faulty |
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| – Replace. |
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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
