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| TROUBLESHOOTING AND REPAIR |
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| Observe Safety Guidelines detailed in the beginning of this manual. |
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| PROBLEMS |
| POSSIBLE AREAS OF |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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| Major physical or electrical damage | 1. Contact | your local authorized |
| 1. Contact the Lincoln Electric |
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| is evident when the sheet metal | Lincoln | Electric Field Service |
| Service Department, |
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| cover is removed. |
| Facility for technical assistance. |
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| The machine is | 1. Make sure the input line switch is |
| 1. Perform | the | Auxiliary | Trans- | |||||
| no LED’s. |
| in the ON position. |
| former Test. |
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| 2. Check the main input line fuses. |
| 2. Perform the DC Bus Board Test. | |||||||
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| If open , replace. |
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| 3. Check the 15 amp circuit break- |
| 2. Perform the Power Board Test. | |||||||
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| er (CB1). Reset if tripped. Also |
| 3. The Bus | Board | rectifier | and or | ||||
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| check CB3. |
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| associated filter | capacitor | (C5) | ||||||
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| 4. Make sure the reconnect switch |
| may be | faulty. | Check | and | ||||
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| replace as necessary. |
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| and jumper lead is configured |
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| correctly | for the applied input |
| 4. The Control Board may be faulty. | ||||||
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| voltage. |
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| 5. If the machine is being operated |
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| with single phase input voltage |
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| make sure the correct lead is not |
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| connected. See the Installation |
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| The main input fuses (or breaker) | 1. Make certain the fuses or break- |
| 1. Check the reconnect switches | ||||||||
| repeatedly fail. |
| ers are sized properly. |
| and associated wiring. | See the | ||||||
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| 2. Make sure the reconnect switch |
| Wiring Diagram. |
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| Input | Rectifier | |||||
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| and jumper lead is configured |
| 2. Perform | the | ||||||
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| correctly for the applied input |
| Test. |
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| voltage. |
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| 3. Perform the Main Switch Board | ||||||
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| 3. The welding procedure may be |
| Test. |
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| drawing too much input current |
| 4. Perform | the | Output | Diode | ||||
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| or the duty cycle may be too |
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| Module Test. |
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| high. Reduce the welding cur- |
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| rent and /or reduce the duty |
| 5. The Input Filter Capacitors may | |||||||
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| cycle. |
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| be faulty. | Check, and if any are | |||||
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| faulty replace all four. |
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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
