TROUBLESHOOTING
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| A. | Input contactor chatters. | 1. | Faulty input contactor. | 1. | Refer to wiring diagram & |
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| check related leads. |
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| 2. | Low line voltage. | 2. | Check input power. |
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| 3. | Pilot transformer (T2) misconnected. | 3. | Check input connection instructions. |
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| B. Machine input contactor does | 1. | Supply line fuse blown. | 1. | Replace if | |
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| not operate. |
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| 2. | Contactor power circuit dead. | 2. | Check pilot transformer T2 and |
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| associated leads. |
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| 3. | Broken power lead. | 3. | Check input voltage at contactor. |
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| 4. | Wrong input voltage. | 4. | Check voltage against instructions. |
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| 5. | Primary thermostats open. | 5. | Check for overheating; make sure fan is |
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| operating and there is no obstruction to free |
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| air flow. Replaces faulty thermostat. |
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| 6. | Open input contactor coil. | 6. | Replace coil. |
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| 7. | Power ”On/Off” switch (S1) not | 7. | Replace switch. |
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| closing. |
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| C. | Machine input contactor | 1. | Electrode or work lead loose or | 1. | Repair connection. |
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| operates, but no output when |
| broken. |
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| trying to weld. |
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| 2. | Open main transformer (T1) | 2. | Repair. |
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| primary or secondary circuit. |
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| 3. | Defective Control P.C. Boards. | 3. | Replace. See P.C. Board |
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| Troubleshooting Procedure. |
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| 4. | Output terminals switch set | 4. | Check setting/operation of the |
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| wrong or faulty. |
| Output Terminals switch. |
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| 5. | Secondary thermostat open. | 5. | Check for overheating; make sure fan is |
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| operating and there is no obstruction to free |
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| air flow. Replaces faulty thermostat. |
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| D. Machine has high output and | 1. | Fault in leads 75, 76, or 77. | 1. | Check wiring. | |
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| no control. |
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| 2. | Open in feedback circuity. | 2. | Check control and protection PC Baord |
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| wiring. With input power off, check for |
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| continuity between (+) output stud and lead |
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| and 1J12 on the control board. Also check for |
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| continuity between GMAW/FCAW |
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| stud and 3J12 on the control board. Finally, |
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| check for continuity between SMAW/SAW |
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| output stud and 2J12. Repair if necessary. |
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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 your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
