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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines | TROUBLESHOOTING GUIDE | |
detailed in the beginning of this manual.
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | ||||||
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| WELDING PROBLEMS |
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The arc is variable or sluggish. | 1. | Check the | 1. Check the weld mode switch | |||||
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| line voltage at the machine. | (SW2) and associated leads for | |||||
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| The input voltage must match | proper operation or loose or | |||||
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| the rating plate and reconnect | faulty | connections. | See the | |||
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| panel configuration. |
| Wiring Diagram. |
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| 2. Make | sure | the machine’s set- | 2. Perform the Firing Board Test. | ||||
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| tings are correct for the welding | 3. Perform the SCR Bridge Test. | |||||
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| process. |
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| 3. | Check | the | welding | cables for | 4. Perform the Main Transformer | ||
| Test. |
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| loose | or | faulty connections. |
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| Also make sure cables are sized | 5. The control board may be | |||||
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| correctly for the welding cur- | faulty. | See the Control Board | ||||
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| rent. |
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| LED Chart. |
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| 4. | See | CV | Mode | Current |
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| Limiting. |
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The Arc Force Control (R4) has no | 1. | The Arc Force Control is active | 1. Check the Arc Force Control | |||||
effect on the arc. |
| only in the CC Stick mode. | potentiometer (R4) for the cor- | |||||
| 2. | The effect | of the | Arc Force | rect | resistance and | proper | |
| operation. Normal resistance is | |||||||
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| Control will be less noticeable | ||||||
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| 10,000 ohms. |
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| at high welding currents. Weld |
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| at low currents (less than 150 | 2. Check the continuity of leads | |||||
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| amps) and check the Arc Force | #321, #322 and #328 from the | |||||
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| control function. |
| Arc Force Control to the control | ||||
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| board. See the Wiring Diagram. | ||
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| 3. The control board may be | ||
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| faulty. Replace. |
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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
