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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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| OUTPUT PROBLEMS |
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| The machine has high welding out- | 1. | If remote control is being used, | 1. | Check the Output Control switch | |||
| put and no control. |
| set the Output Control Switch |
| (S2) and associated wiring. See | |||
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| (S2) to the “Machine or Local” |
| the Wiring Diagram. | |||
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| position and control the weld | 2. Check feedback | leads #220, | |||
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| output with the machine Output | |||||
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| #204, #205 and #206 for loose | ||||
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| Control (R4). If the problem is |
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| or faulty connections. | ||||
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| solved, check the remote con- |
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| trol unit or wire feeder and asso- | 3. | Perform | the | SCR/Diode | |
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| ciated control cable. |
| Rectifier Bridge Test. | |||
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| 2. Check the remote control leads | 4. The control board may be | |||||
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| for “grounds” to the negative |
| faulty. Replace. |
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| welding output. If leads #75, |
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| #76 or #77 are “grounded” to the |
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| negative welding output, the |
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| machine output may go very |
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| high without control. |
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| The machine has minimum (or very | 1. | If remote control is being used, | 1. | Check the Output Control (R4) | |||
| low) welding output and no control. |
| set the Output Control Switch |
| and associated wiring. See the | |||
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| (S2) to the “Machine or Local” |
| Wiring Diagram. |
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| position and control the weld | 2. Check the Output Control switch | ||||
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| output with the machine Output | |||||
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| (S2) and associated wiring. See | ||||
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| Control (R4). If the problem is |
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| the Wiring Diagram. | ||||
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| solved, check the remote con- |
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| trol unit or wire feeder and asso- | 3. | Perform the Main Transformer | |||
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| ciated control cable. |
| Test. |
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| 2. | Make certain the remote control | 4. | Perform the SCR/Diode Rectif- | |||
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| leads (#75, #76, #77) are not |
| ier Bridge Test. |
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| grounded to the positive welding | 5. The control board may be faulty. | ||||
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| output. | |||||
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| 3. Make certain the |
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| input voltage is correct and |
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| matches the machine rating and |
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| the reconnect panel. |
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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
