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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 |
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(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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The input contactor activates | 1. | Check the input voltage at the | 1. | Perform the Input Contactor |
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when “start” button is pushed but |
| machine. Input voltage must |
| Test. |
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will NOT stay closed. Machine |
| match the rating plate and the | 2. | Perform the Control |
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shuts off when “start” button is |
| reconnect panel. |
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| Transformer Test. |
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released. |
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2. Blown or missing control cir- |
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| 3. | Perform the Feed – Thru PC |
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| cuit fuse (F1). |
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| Board Test. |
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| 4. | Perform the Control Board |
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| Interlock Test. |
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| 5. | The power board may be |
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| faulty. Replace. |
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The machine shuts off and the | 1. | Check the input voltage at the | 1. | Perform the Control |
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control fuse (F1) repeatedly fails. |
| machine. Input voltage must |
| Transformer Test. |
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| match the rating plate and the | 2. | Perform the Power Board |
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| reconnect panel. |
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| Test. |
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| 2. Make sure the fuse is the cor- | 3. | The control board may be |
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| rect rating (1/2 amp). |
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| faulty. Replace. |
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| 3. The input voltage may be too |
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| high (more than 10% over |
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| rated). |
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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
SQUARE WAVE TIG 355
