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TROUBLESHOOTING & REPAIR | ||||||
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| TROUBLESHOOTING GUIDE - Observe all Safety Guidelines detailed throughout this manual | |||||
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| PROBLEMS | POSSIBLE AREAS OF |
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| (SYMPTOMS) | MISADJUSTMENTS(S) |
| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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No Open Circuit Voltage output but | 1. Check the input voltage at the | 1. | Check for loose or broken con- |
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wire feeds normally when gun trig- | machine. Input voltage must |
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ger is pulled. | match the rating plate and the |
| the choke, the capacitor bank |
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| reconnect panel. |
| and all heavy current carrying |
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| leads. |
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| 2. The gun may be faulty. Check |
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| or replace. | 2. | Make sure that the transformer |
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| secondary leads are | securely |
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| connected to the SCR Rectifier |
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| Assembly. |
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| 3. | Perform the SCR | Rectifier |
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| Assembly Test. |
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| 4. | The control board may be faulty |
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| - Replace. |
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Wire feeds but welding output is low | 1. Make sure that the proper wire | 1. | Check for loose or faulty con- |
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causing wire to "stub". Welds are | and procedures are being used. |
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"cold". Machine cannot obtain full |
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| carrying leads. |
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rated output of 200 amps at 28 volts. | 2. Check gun and work cable for |
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| loose or faulty connections. | 2. | The output capacitor bank may |
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| be faulty. Check for loose con- |
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| nections at the capacitors. Also |
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| check for leaky capacitors. |
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| Replace if necessary. |
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| WARNING: The liquid elec- |
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| trolyte in these capacitors is |
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| toxic. Avoid contact with any |
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| portion of your body. |
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| 3. | Perform the SCR | Rectifier |
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| Assembly Test. |
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| 4. | Perform the Main Transformer |
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| Test. |
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| 5. | 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, con- tact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call 216-
