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| TROUBLESHOOTING & REPAIR |
| |
| TROUBLESHOOTING GUIDE | Observe Safety Guidelines | |
|
| detailed in the beginning of this manual. | |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED | |
(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION | |
|
|
| |
| FUNCTION PROBLEMS |
| |
The machine welds at very high | 1. Make sure the start controls | 1. Perform the SCR Bridge Test. | |
outputs, regardless of the Peak | are set correctly for the | 2. The power board may be | |
Current control setting. | process being used. | ||
faulty. Replace. | |||
|
| ||
| 2. If the machine is in Remote | 3. The control board may be | |
| control mode, change modes | ||
| faulty. Replace. | ||
| to Local control. If the prob- | ||
|
| ||
| lem is resolved, the remote |
| |
| control unit may be defective. |
|
The Arc Force control has no | 1. The Arc Force control is active | 1. | Check the Arc Force control |
effect on the arc. | only in the Stick mode. |
| potentiometer for correct resis- |
| 2. The effect of the Arc Force |
| tance and proper operation. |
|
|
| |
| control will be less noticeable | 2. | Check the continuity of leads |
| at high welding currents. Weld |
| #441 and #445. See Wiring |
| at low currents (less than 150 |
| Diagram. |
| amps) and check the Arc Force | 3. | The control board may be |
| control function. | ||
|
| 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
SQUARE WAVE TIG 355
