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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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|
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| FUNCTION PROBLEMS |
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Digital display does not light. | 1. Contact your local authorized | 1. Check for 5VDC from 2J7+ to |
Machine turns on and operates | Lincoln Electric Field Service | 4J7- on the display board. If |
normally. | Facility. | the voltage is present and the |
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| display does NOT light, the |
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| display board may be faulty. |
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| Replace. |
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| 2. The control board may be |
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| faulty. Replace. |
The display lights but a current | 1. Contact your local authorized | 1. Set the Peak Current control |
cannot be preset. | Lincoln Electric Field Service | (R10) to the 12 o’clock posi- |
| Facilty. | tion. Position the Start Current |
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| switch (S13) to the off position. |
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| The machine should weld at |
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| approximately 80 amps. If the |
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| machine welds properly but |
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| does NOT display the actual |
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| welding current, the meter |
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| board may be defective. |
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| Replace. |
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| 1a. The control board may be |
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| defective. Replace. |
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| 2. If the machine does NOT weld |
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| properly, check or replace the |
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| Peak Current control poten- |
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| tiometer (R10). |
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| 2a. The control board may be |
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| faulty. Replace. |
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
SQUARE WAVE TIG 355
