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| TROUBLESHOOTING & REPAIR | |
| TROUBLESHOOTING GUIDE | Observe Safety Guidelines |
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| detailed in the beginning of this manual. |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED | |
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | |
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| OUTPUT PROBLEMS |
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Machine has low welding output | 1. The brushes may be worn. | 1. | If the engine HIGH IDLE RPM is |
and low auxiliary output. | Contact your local Lincoln |
| low, then perform The Throttle |
| Authorized Service Facility. |
| Adjustment Test. |
| 2. The engine RPM may be low. | 2. | Perform the Rotor Voltage Test. |
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| 3. | If the rotor voltage is low the |
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| Field Capacitor (C1) or the Field |
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| Bridge (D2) may be faulty. Test |
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| and replace if necessary. |
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| 4. | Check the Output Control |
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| Potentiometer. Normal resis- |
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| tance is 10,000 ohms. Also |
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| check associated wiring for |
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| loose or faulty connections. |
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| 5. | The Rotor may be faulty. |
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| Perform the Rotor Resistance |
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| Test. |
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| 6. | The Printed Circuit Board may |
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| be faulty. Replace. |
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| 7. | If the engine HIGH IDLE RPM is |
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| OK, then the engine may have |
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| lost horsepower and be in need |
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| of major repair. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call