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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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| FUNCTION PROBLEMS |
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| The machine regularly overheats | 1. | Check the 3.5 amp circuit | 1. | The 115VAC fan motor is con- | ||||||||
| and the yellow thermal light is ON |
| breaker (CB2). Reset if tripped. |
| trolled by the control board via | ||||||||
| indicating a thermal overload. |
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| the main switch board. Perform | |||
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| 2. | The welding application may |
| the Fan Motor And Control | ||||||||
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| be exceeding the |
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| Test. |
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| recommended duty cycle of the |
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| 1. | A thermostat or associated cir- | |||||
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| cuitry may be faulty. See the | |||
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| 3. | Dirt and dust may have clogged |
| wiring diagram. | One normally | |||||||
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| the cooling channels inside the |
| closed thermostat is located on | ||||||||
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| machine. |
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| the output choke and the other | ||||
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| is located on the main switch | |||
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| 4. Air intake and exhaust louvers |
| board heat sink. See the wiring | |||||||||
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| may be blocked due to inade- |
| diagram. |
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| quate clearance | around | the |
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| machine. |
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| Note: The Main Switch Board | |||||
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| Removal Procedure will be | |||
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| 5. | Make certain the fan as needed |
| required to gain access to | ||||||||
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| (F.A.N.) | is operating | properly. |
| the heat sink thermostat. | ||||||
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| The fan should operate when |
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| welding | voltage | is | present |
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| and/or when there is an over |
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| temperature condition. |
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| An attached wire feeder will not | 1. | Make certain the wire feeder | 1. Perform | the | Auxiliary | |||||||
| function correctly. |
| control | cable is connected to |
| Transformer Test. | |||||||
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| the correct |
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| type | plug | (115VAC | or | 2. Check the | leads | between the | ||||
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| 24/42VAC) for | the wire feeder |
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| being used. See the connection |
| the auxiliary transformer for | ||||||||
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| diagram. If wirefeeder has DIP |
| loose or faulty connections. | ||||||||
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| switch, be sure it is set correct- |
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| ly. |
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2.Check the two circuit breakers located at the rear of the machine. Reset if tripped.
3.The wire feeder or control cable may be faulty.
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
