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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) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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| The voltmeter reads “00” in Stick |
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| 1. Inspect to assure that the arc |
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| 1. | Check for loose connectors at |
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| Mode, and there is no output from |
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| start switch is in the on |
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| the SCR bridge and at the |
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| the machine when in the TIG |
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| (closed) position when |
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| Protection/Snubber board. (J10) |
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| welding in the TIG Mode. |
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| and (J11). See Figure F.2 at |
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| end of this Guide for location. |
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| 2. | Check the wiring to the Control |
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| Transformer (T2). Observe |
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| directions on decal. |
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| 3. | The Protection/Snubber board |
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| may be faulty. See |
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| Protection/Snubber Board |
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| Continuity Test. |
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| 4. | Check the Control Transformer |
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| (T2). See Control Transformer |
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| Voltage Test. |
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| 5. | Check the polarity switch (S2) |
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| for loose or broken connections. |
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| 6. | Check the SCR bridge. See |
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| Static and Active SCR Tests. |
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| 7. | If all previous tests are OK - |
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| then replace the Control board. |
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| Machine does not respond (no gas |
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| 1. Machine MUST be in one of |
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| 1. | Check trigger circuit. See Arc |
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| flow, no high frequency and no |
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| the TIG Modes. |
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| Start Trigger Circuit Test |
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| open circuit voltage) when arc |
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| 2. | Check the Control transformer |
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| switch or amptrol is activated - |
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| 2. The arc start switch or amptrol |
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| displays and fan working. Note: |
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| may be defective. Check for |
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| (T2). See Control Transformer |
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| Machine may have OCV in the |
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| continuity between pins “D” |
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| Voltage Test. |
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| Stick Mode. |
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| and “E” on cable connector |
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| 3. | Protection/Snubber board may |
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| when arc switch or amptrol is |
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| activated. |
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| be faulty. See |
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| Protection/Snubber Board |
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| Continuity Test. |
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| 4. | If all previous tests are OK - |
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| then replace the Control board. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call
