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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. | ||||
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PROBLEMS |
| POSSIBLE AREAS OF |
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(SYMPTOMS) |
| MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| FEEDING PROBLEMS |
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Major physical or electrical dam- | Contact Lincoln Electric Service |
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age is observed when cover wrap- | Department |
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around is removed. |
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Machine is dead — no output — | Power Switch must be in ON posi- | Check continuity of | |||||
no fan — no display. |
| tion. |
| blow fuse located on reconnect | |||
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| panel. |
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| Check input voltage. |
| 1. Check Power Switch (S1). | |||
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| If machine is set for | 2. Look for loose or broken wires | ||||
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| operation, inspect to assure that | between Power Switch and |
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| WHITE and BLACK leads of the |
| Input Rectifier (component | |||
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| Power Cord are connected properly |
| D13). |
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| and RED lead is not connected and | 3. Check for broken leads to pri | ||||
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| is insulated. |
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| mary of Auxiliary Transformer | ||
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| Check that input voltage |
| T1. |
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| switch and jumper A (the reconnect, | 4. | Possible open primary coil of | |||
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| auxiliary jumper) are in proper posi- | |||||
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| tion for input voltage being used. |
| Auxiliary Transformer T1. |
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No output but fan operates and the | Output Terminal Switch or Remote | 1. | See Output Pilot Circuit test. | ||||
meter display is on. |
| Trigger MUST be in ON position. | 2. See Thermal Protection AC | ||||
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| Local/Remote Switch must be in |
| Trigger Circuit test. |
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| LOCAL position unless remote con- | 3. | See Overvoltage Protection | |||
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| trol device is attached to remote | |||||
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| receptacle. |
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| DC Trigger Circuit test. |
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| If machine has not been used for a | 4. | See Capacitor Balance | test | ||
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| long time and is connected for | 380 | 5. | See Switch PC Board test. | ||
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| VAC or higher, Capacitors may | |||||
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| need “conditioning.” See Input | 6. | See Power Board test |
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| Filter Capacitor Conditioning | in |
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| this section |
| 7. Look for broken or loose con- | |||
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| nections on high | ||
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| ing parts of machine (i.e., | ||
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| choke, output bridges, | output | |
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| studs, main transformer. |
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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
