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| TROUBLESHOOTING AND REPAIR |
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| Observe Safety Guidelines detailed in the beginning of this manual. |
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| PROBLEMS |
| POSSIBLE AREAS OF |
| RECOMMENDED |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| FUNCTION PROBLEMS |
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| The machine regularly | overheats | 1. The welding application may |
| 1. The 115VAC fan motor is con- | ||||||||||
| and the yellow thermal light is ON | be exceeding the recommended |
| trolled by the control board via | |||||||||||
| indicating a thermal overload. | duty cycle of the POWER WAVE |
| the main switch board. Perform | |||||||||||
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| 355M/405M. |
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| the Fan Motor And Control | |||||||
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| 2. Dirt and dust may have clogged |
| Test. |
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| the cooling channels inside the |
| 1. A thermostat or associated cir- | ||||||||||
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| machine. |
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| cuitry | may | be faulty. | See the | |||
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| 3. Air intake | and exhaust louvers |
| wiring | diagram. | One | normally | ||||||
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| closed thermostat is located on | |||||||||||
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| may be blocked due to inade- |
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| the output choke, one on the DC | |||||||||||
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| quate clearance | around the |
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| Bus Board | and | the | other is | ||||||||
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| machine. |
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| located on the main switch | |||||||
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| 4. Make certain the fan as needed |
| board heat sink. See the wiring | ||||||||||
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| diagram. |
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| (F.A.N.) | is | operating | properly. |
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| The fan | should operate when |
| Note: The Main Switch | Board | ||||||||
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| welding | voltage | is | present |
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| Removal Procedure will be | |||||||||||
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| and/or when there | is | an over |
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| required | to gain access to | ||||||||||
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| temperature condition. |
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| the heat sink thermostat. | ||||||||||
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| An attached wire feeder | will not | 1. Make certain the wire feeder |
| 1. Check for 40 VDC on pin “D” (+) | ||||||||||
| function correctly. Apparently the | control | cable is connected to |
| and pin “E” | ||||||||||
| wire feeder is not being powered- | the wire feeder receptacle. See |
| wire feeder | receptacle. | See | |||||||||
| up. |
| the Wiring Diagram. |
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| Wiring Diagram. |
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| 2. Check the | two | circuit | breakers |
| If 40 volts DC is Not present at | |||||||
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| the Power | Wave | wire |
| feeder | |||||||
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| located | at | the | front | of the |
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| receptacle, perform the DC Bus | |||||||||||
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| machine. Reset if tripped. |
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| Board Test. |
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| 3. The wire feeder or control cable |
| 2. Check the DC Bus Board rectifi- | ||||||||||
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| may be faulty. |
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| er. See Wiring Diagram. |
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| 3. Perform the T1 Auxiliary trans- | |||||
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| former Test. |
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| 4. If the 40 volts DC is present at | |||||
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| the Power Wave wire feeder | |||||
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| receptacle, the problem is in the | |||||
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| control cable or the wire | |||||
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| drive/control box. |
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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 the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call
