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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 | |||
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | |||
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| ENGINE PROBLEMS |
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Engine will not idle down to low | 1. | Make sure the Idler switch (S4) | 1. | Perform the Idler Solenoid Test. | |
speed. Machine has normal weld |
| is in the “AUTO” position. | 2. | Make sure the control board | |
and auxiliary power. |
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2. | Make sure there is not an exter- |
| mounting/grounding screws are | ||
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| nal load on either the weld ter- |
| tight. | |
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| minals or the auxiliary recepta- | 3. Check leads #226, #227, #237 & | ||
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| #254 for loose or faulty connec- | ||
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| 3. | Check for mechanical restriction |
| tions. See the Wiring Diagram. | |
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| in the solenoid linkage. | 4. Check solenoid waveforms as | ||
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| illustrated in the Oscilloscope | |
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| Waveforms Section. | |
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| 5. Check to make sure that leads | ||
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| #227 & #232 at the B1 & B3 ter- | |
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| minals on the control board are | |
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| not swapped. See the Wiring | |
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| Diagram. | |
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Engine will not go to high idle when | 1. Make sure the welding cables | 1. Check the current sensing toroid | |||
attempting to weld or use auxiliary |
| and connections are tight. |
| for loose or faulty connections. | |
power. Output is normal when Idler | NOTE: The automatic idler may |
| CV models only. See the Wiring | ||
switch is in the “HIGH” position. |
| Diagram. | |||
Automatic idle function works prop- |
| not function if the auxiliary |
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| power is loaded to less | 2. | Make sure the toroid and lead | ||
erly when the auxiliary power is |
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| than 150 watts. |
| assembly are assembled cor- | ||
loaded. |
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| rectly. CV models only. See the | ||
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| Wiring Diagram. | |
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| 3. Check the shunt and associated | ||
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| leads for loose or faulty connec- | |
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| tions. Stick models only. | |
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| 4. The control board may be faulty. | ||
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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 1-
