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| TROUBLESHOOTING & REPAIR | |
| TROUBLESHOOTING GUIDE | Observe Safety Guidelines |
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| detailed in the beginning of this manual. |
PROBLEMS | POSSIBLE AREAS OF |
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(SYMPTOMS) | MISADJUSTMENT(S) |
| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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The machine is dead – no output – | 1. If the amber thermal protection | 1. Check the leads and connec- | |||||||
no fan. The input contactor does | light is on, the primary or sec- |
| tions between the thermostats, | ||||||
not operate. The amber thermal | ondary thermostat is | open. |
| the input contactor (1CR) and | |||||
protection light is on. The pilot | Allow the machine to cool. |
| the power switch (SW1). | See | |||||
light is on. | Check the fan motor for proper |
| the Wiring Diagram. |
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| operation. Make sure all case | 2. | One of | the | (normally | closed) | |||
| openings are free for proper cir- | ||||||||
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| thermostats may be faulty. |
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| culation of air. Operate the |
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| machine at rated current and |
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| duty cycle. |
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The input contactor (CR1) chatters. | 1. Make certain the | 1. Perform the Input Contactor | |||||||
| input voltage matches the rat- |
| Test. |
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| ing plate and the reconnect |
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| panel. |
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The machine has high welding out- | 1. If the remote control is being | 1. Check the Output Control | |||||||
put and no control. | used, set the output control |
| Switch (SW2) and the Dial | ||||||
| switch (SW2) to the Machine or |
| Selector | Switch | (SW3) | and | |||
| Local position and control the |
| associated | wiring. See | the | ||||
| weld output with the machine |
| Wiring Diagram. |
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| Output Control (R1). | If the | 2. | Check | the | feedback leads | |||
| problem is resolved, check the | ||||||||
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| #205, #206, #204 and #225 for | |||||||
| remote control unit and associ- |
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| loose or faulty connections. |
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| ated cable leads. If the Pocket |
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| Amptrol option is being used, | 3. | Perform | the | SCR/Diode | ||||
| the Pocket Amptrol circuit may |
| Rectifier Bridge Test. |
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| be faulty. |
| 4. If the Pocket Amptrol is not | ||||||
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| functioning | properly, | perform | |||
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| the Pocket | Amptrol | Circuit | |||
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| Test. |
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| 5. The control board may be | ||||||
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| faulty. Replace. |
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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
