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TROUBLESHOOTING & REPAIR |
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TROUBLESHOOTING GUIDE |
| Observe Safety Guidelines | |
| detailed in the beginning of this manual. | ||
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PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED | |
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | |
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| OUTPUT PROBLEMS |
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The input contactor operates - the | 1. If the amber thermal protection | 1. Perform the Main Transformer | |
fan runs - the pilot light is on - but | light is on, the primary or sec- | Test. | |
the machine has no welding output. | ondary thermostat is open. |
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| Allow machine to cool. | 2. Perform the SCR/Diode Recti- | |
| 2. Make certain the output trigger | fier Bridge Test. | |
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| circuit (#2 and #4) is being acti- | 3. The control board may be faulty. | |
| vated by a “closure.” | ||
| Replace. | ||
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| 3. Check the 10 amp circuit break- |
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| er in the 42VAC circuit. Reset if |
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| necessary. |
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| 4. If remote control is not being |
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| used, make certain the Output |
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| Control switch (S2) is in the |
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| “Machine or Local” position. |
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| 5. Check for loose or faulty welding |
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| cable connections. |
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The input contactor (CR1) chatters. | 1. Make certain the | 1. Perform the Input Contactor | |
| input voltage matches the | Test. | |
| machine rating plate and the |
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| reconnect panel. |
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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 216-
