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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 |
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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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| The control panel displays cannot |
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| 1. | Check for loose connections at |
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| be read. The characters run, dis- |
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| plug J3 on the control board. |
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| play only half characters, or ran- |
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| dom dots may appear on display. |
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| 2. | The display may be faulty. |
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| Replace. |
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| 3. | The control board may be |
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| faulty. Replace. |
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| The voltmeter always reads “00” . |
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| 1. | Check the continuity of leads |
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| The machine output is normal. |
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| #305 and #313C and their con- |
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| nections to the machine output |
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| studs. Refer to wiring diagram. |
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| 2. | The Control board may be |
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| faulty. Check for machine |
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| “open citcuit voltage” at 5J6 |
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| and 12J6 on the Control board. |
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| If open circuit voltage is pre- |
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| sent then replace the Control |
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| board. |
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| 3. | If open circuit voltage is not |
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| present at 5J6 and 12J6 (see |
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| Figure F.1) then check the |
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| Protection/Snubber board. See |
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| Protection/Snubber Board |
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| Continuity Test. |
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| The control panel display back- |
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| 1. | Check for loose connector (P3) |
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| ground is dark instead of red. The |
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| at the Control board. |
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| machine operates normally. |
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| 2. | The Control board may be |
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| faulty. Disconnect P3 from the |
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| Control board. Check voltage |
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| from 1J3 to 2J3 on the board. |
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| See Figure F.1. The voltage |
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| should be 15 to 20vdc. If the |
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| voltage is not | correct then |
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| replace the Control board. |
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| 3. | If the Control board is good |
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| then the Display may be faulty. |
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| Replace Display. |
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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