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| TROUBLESHOOTING & REPAIR |
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| 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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| FUNCTION PROBLEMS |
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The display cannot be seen clear- | 1. | Adjust the viewing angle of the | 1. | Perform the LCD Display Test. |
ly or cannot be seen at all. |
| display. Follow the instructions |
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| provided in the Operation |
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| Section of this manual. (Look |
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| under the “LCD DISPLAY |
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| ADJUSTMENTS” in the “CON- |
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| TROLS AND SETTINGS” sub- |
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| section of the Operation |
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| Section.) |
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Machine does not respond to | 1. | Each time an overlay is | 1. | Using the test and calibration |
keys being pressed, or the |
| changed, make certain that the |
| overlay |
machine has improper displays. |
| machine is |
| the keyboard/LED test. See |
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| the new overlay in place. |
| overlay. |
| 2. | Make certain that the correct | 2. | Perform the Serial Loop |
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| overlay ID number is displayed |
| Wiring Harness Test. |
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| on | 3. Replace the control board and | |
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| Operation Section of this | ||
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| perform voltage calibration and | |
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| manual for the overlay descrip- |
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| current calibration. | |
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| tion. |
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| 3. In some cases, some of the | 4. Replace the display board and | ||
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| perform voltage calibration. | ||
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| keys on the overlay may be |
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| locked out. Refer to the | 5. | Replace the power board. |
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| Operation Section of this |
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| manual for the overlay descrip- |
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| tions. |
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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 1-
