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TROUBLESHOOTING & REPAIR |
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| 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 |
| 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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| FUNCTION PROBLEMS |
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| AC/DC Indicator on control panel |
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| None |
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| 1. | Check leads #304 and #312 for |
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| display show AC when polarity |
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| proper connections. Refer to |
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| switch is in the DC position, or vice |
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| wiring diagram |
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| versa — machine has output but |
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| balance control is not operable in |
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| 2. | Check microswitch (S2A), |
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| the AC TIG mode. |
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| located on polarity switch (S2), |
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| for proper operation. |
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| 3. | The protection/snubber board |
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| may be faulty. See protection/ |
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| snubber board continuity test. |
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| 4. | Check control transformer (T2). |
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| See control transformer voltage |
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| test. |
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| 5. | If above checks are OK, then |
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| replace the control board. |
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| All red keypad LEDS are dark |
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| None |
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| 1. | The wiring harness between |
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| but the control panel display is |
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| the Control board and the LED |
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| operable. The machine has output. |
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| board may be faulty. Check for |
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| defective plugs or loose wires. |
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| 2. | 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 tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call