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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 | POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | ||
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| OUTPUT PROBLEMS |
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The machine has low welding out- | 1. | The engine RPM may be low. | 1. If the engine high idle speed is | |
put and low auxiliary output. | 2. Check the brushes for wear and | low, perform the | Engine | |
| Throttle Adjustment Test. | |||
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| proper contact to the slip rings. | ||
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| 2. Perform the Rotor Resistance | |
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| Test. |
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| 3. Perform the Flashing and | |
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| Rotor Voltage Test. If the rotor | |
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| voltage is low, the field capaci- | |
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| tor or field bridge may be faulty. | |
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| Test and replace if necessary. | |
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| See the Wiring Diagram. | |
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| 4. If the engine high idle RPM is | |
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| OK but slows down excessively | |
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| under load, then the engine | |
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| may have lost horsepower and | |
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| be in need of major repair. | |
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The machine control is still active | 1. | This is normal in TIG mode. | 1. Check Plug J10 on the Control | |
when the remote control unit is | 2. The remote control unit may be | Board for loose or | faulty con- | |
connected. | nections. |
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| defective. |
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| 2. The bypass board may be | ||
| 3. Check the amphenol connec- | |||
| faulty. |
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| tions and associated wiring. | 3. The Control Board may be | |
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| faulty. |
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Machine seems to be locked into | 1. | Check the position of the Mode | 1. Check the Mode Selector switch | |
the CC mode of operation (stick |
| Selector switch. It must be in | and associated wiring. See the | |
mode.) |
| the correct position for the | Wiring Diagram. |
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| process being used. | 2. The Control Board may be | |
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| 2. Check that jumper plug J3 is | faulty. |
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| properly installed in the Control |
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| Board. (J3 has a jumper wire |
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| from pin 1 to pin 5.) |
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| 3. Make sure plug J2 is properly |
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| connected to the Control Board. |
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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, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
