| TROUBLESHOOTING |
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| Observe all Safety Guidelines detailed throughout this manual | ||||
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| PROBLEMS |
| POSSIBLE AREAS OF |
| RECOMMENDED |
| (SYMPTOMS) |
| MISADJUSTMENTS(S) |
| COURSE OF ACTION |
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| PROBLEMS |
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Thermal Protection Indicator light is | 1. | Thermostat circuit has opened. | 1. | Allow machine to cool. Be sure to | |
on. |
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| provide adequate ventilation for | |
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| machine. |
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| 2. | Faulty Control PC Board. | 2. | See PC Board Troubleshooting |
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| Procedure. |
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Machine does not have maximum | 1. | Faulty Control PC Board. | 1. | See PC Board Troubleshooting | |
output |
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| Procedure. | |
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| 2. | Voltage Adjust potentiometer | 2. | Check and replace if faulty. |
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| defective. |
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| 3. | Voltage Adjust potentiometer | 3. | Check and repair broken leads. |
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| leads open. |
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Machine will not shut off. | 1. | Defective power switch. | 1. | Replace. | |
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Variable or sluggish welding arc. | 1. | Poor work or electrode | 1. | Check and clean all connections. | |
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| connection. |
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| 2. | Welding leads too small. | 2. | Check table in this manual. |
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| 3. | Welding current or voltage | 3. | Check procedures for recommended |
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| too low. |
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| 4. | Defective SCR bridge. | 4. | Check and replace if defective. |
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Digital meters do not light | 1. | Faulty Meter PC board. | 1. | See PC Board Troubleshooting | |
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| Procedure. | |
Digital meter display is incorrect. |
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| 2. | Faulty Control PC Board. | 2. | See PC Board Troubleshooting |
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| Procedure. |
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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 your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.