| TROUBLESHOOTING | |||
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| Observe all Safety Guidelines detailed throughout this manual | |||
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| PROBLEMS | POSSIBLE | RECOMMENDED |
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| (SYMPTOMS) | CAUSE | COURSE OF ACTION |
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PROBLEMS
Thermal Protection Indicator light is | 1. | Thermostat circuit has opened. | |
on. |
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| 2. | Faulty Control PC Board. | |
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Machine does not have maximum | 1. Faulty Control PC Board. | ||
output |
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| 2. | Voltage Adjust potentiometer | |
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| defective. | |
| 3. | Voltage Adjust potentiometer | |
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| leads open. | |
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Machine will not shut off. | 1. | Defective power switch. | |
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Variable or sluggish welding arc. | 1. | Poor work or electrode | |
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| connection. | |
| 2. | Welding leads too small. | |
| 3. | Welding current or voltage | |
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| too low. | |
| 4. | Defective SCR bridge. | |
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Digital meters do not light | 1. | Faulty Meter PC board. | |
- or - |
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Digital meter display is incorrect. |
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| 2. | Faulty Control PC Board. | |
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If all recommended possible areas of misadjustment have been checked and the problem persists,
Contact your local Lincoln Authorized Field Service Facility.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.