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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. | |||||||
| PROBLEMS |
| POSSIBLE AREAS OF |
| RECOMMENDED |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION | ||||||
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| OUTPUT PROBLEMS |
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| No welding output. The 115 VAC is | 1. | Make sure the polarity switch is |
| 1. | Check for loose or faulty connec- | |||||
| present at the receptacle. |
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| in the proper position and func- |
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| tions on the heavy current carry- | ||||
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| 2. | tioning correctly. |
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| ing leads. ( Polarity switch, out- | ||||
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| One of the thermostats may be |
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| put choke, output terminals, etc.) | |||||
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| tripped. Allow the machine to |
| 2. | Check for faulty connections or a | ||||
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| cool. The thermal light will be |
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| on. |
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| defective thermostat. | Check | |||
| NOTE: BEFORE REPLACING A | 3. Make sure the welding cables, |
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| leads #213 and #214. See the | ||||||
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| Wiring Diagram. | The | thermal | ||||||
| CONTROL BOARD |
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| torch and connections are in |
| 3. | light will be on. |
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| If an Advanced Control Panel is |
| good operating condition. |
| Perform the T1 | Transformer | |||||
| installed, remove it and replace |
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| T st. |
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| the Jumper in connector |
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| 4. | Perform the | SCR Bridge Test. | ||||
| the machine functions normally, |
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| the Advanced Process panel or |
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| 5. | Check the output controls R1, R4 | |||||
| harness is defective. |
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| and associated | wiring. See | |||
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| 6. | Wiring Diagram. |
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| Check the J4 connection on the | |||||
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| control board. |
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| 7. 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
PRECISION TIG 275
