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TROUBLESHOOTING & REPAIR | |||||||
TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | |||
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| detailed in the beginning of this manual. | ||||
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PROBLEMS |
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| POSSIBLE AREAS OF |
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(SYMPTOMS) |
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| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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Machine is dead. No output - No | 1. | Make sure that the input power | 1. | Check the input power switch |
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fan |
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| switch is in the "ON" position and |
| and associated wires for loose or |
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| the machine is plugged in. |
| faulty connections. |
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| 2. | Check the input voltage at the | 2. | Perform the T1 Transformer |
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| machine. Input voltage must |
| Test. |
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| match the rating plate and volt- |
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| age connection. Refer to |
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| Reconnect Procedure in the |
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| Installation section of this manu- |
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| al. |
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| 3. Blown or missing fuses in the |
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| input line. |
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The fan runs normally. No output | 1. | Check for proper input voltages | 1. | Check for loose or faulty connec- |
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from the machine in either Stick or |
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TIG modes. |
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| reconnect configuration. |
| ing leads. (polarity switch, output |
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| choke output terminals etc.) |
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| 2. Check to make sure the polarity |
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| switch is in the proper position | 2. | Perform the T1 Transformer |
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| and functioning correctly. |
| Test. |
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| 3. | Perform the SCR Bridge Test. |
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| 4. | Check current control R1 for |
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| proper operation. Normal resis- |
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| tance is 10,000 ohms. Also |
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| check associated leads | for loose |
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| or faulty connections. |
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| 5. | The control board may be faulty. |
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| 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
