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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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| OUTPUT PROBLEMS |
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Fans and display are functional. | 1. The primary thermostat may be | 1. | If the machine works properly |
No output from machine in either | open. Allow machine to cool. |
| in Local control mode but not |
Stick or TIG modes. | 2. If the machine is in Remote |
| in Remote control, then per- |
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| form the Protection Board | |
| control mode, make sure a |
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| Test. | |
| Lincoln remote control device |
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| is connected to the amphenol. | 2. | If the machine does NOT have |
| 3. If the machine works properly |
| output in either mode, Local or |
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| Remote, check the primary | |
| in the Local control mode, |
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| thermostat for proper opera- | |
| check or replace the remote |
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| tion. It is normally closed. | |
| control device. |
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| 3. | Perform the Arc Start Trigger |
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| Circuit Test. |
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| 4. | Perform the SCR Bridge Test. |
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| 5. | Perform the Control |
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| Transformer Test. |
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| 6. | Perform the Power Board |
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| Test. |
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| 7. | 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
SQUARE WAVE TIG 355
