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TROUBLESHOOTING & REPAIR |
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Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | |||
detailed in the beginning of this manual. |
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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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Major physical or electrical dam- | 1. | Contact the Lincoln Electric |
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age is evident. |
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| Service Dept. |
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The machine is dead - the input | 1. | The power switch (S1) is in the | 1. Check the power switch (S1) | |||
contactor does not operate. The |
| ON position. | and associated leads and con- | |||
pilot light is not lit. |
| 2. | Check for blown or missing | nections. | See the | Wiring |
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| Diagram. |
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| fuses in the input lines. |
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| 3. | Check the | 2. Perform the | Control | Trans- |
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| former Test. |
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| line voltage at the machine. |
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| The input voltage must match |
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| the rating plate and reconnect |
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| panel. |
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The input contactor operates, but | 1. | Check the electrode and work | 1. Perform the Internal Trigger | |||
no welding output. | The 115 VAC |
| cables for loose or faulty con- | Circuit Test. |
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auxiliary supply is | present at the |
| nections. | 2. Perform the Firing Board Test. | ||
receptacle. |
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| 2. If the Thermal Protection Light |
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| 3. Perform the Main Transformer | ||||
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| is ON, the machine is overheat- | |||
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| Test. |
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| ed. Wait for the machine to |
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| cool and remedy the cause of | 4. Perform the SCR Output | ||
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| the overheating problem. See | Bridge Test. |
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| the Fan/Snubber Board LED | 5. The control | board may be | |
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| Chart. | |||
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| faulty. See Control Board LED | |||
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| 3. | Make certain either the output | Chart. |
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| terminals switch is in the ON |
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| position or the external gun |
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| trigger circuit is functioning |
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| properly. |
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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
