Return to Section TOC Return to Master TOC
Return to Section TOC Return to Master TOC
Return to Section TOC Return to Master TOC
TROUBLESHOOTING & REPAIR | ||||||
| Observe Safety Guidelines |
|
| TROUBLESHOOTING GUIDE | ||
| detailed in the beginning of this manual. |
|
|
| ||
| PROBLEMS |
| POSSIBLE AREAS OF | RECOMMENDED |
| |
| (SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION | ||
|
|
| OUTPUT PROBLEMS |
| Perform the SCR Bridge Test. | |
| The machine welds at a very high | 1. If welding in the TIG mode, the | 1. | |||
| output regardless of the current | remote control device may be | 2. | Perform the T1 Transformer | ||
| control setting. |
| defective. | 3. | Test. |
|
| NOTE: BEFORE REPLACING A |
| Check the output current con- | |||
|
|
| trols for proper | operation. | ||
| CONTROL BOARD |
|
| Normal resistance | is 10,000 | |
| If an Advanced Control Panel is |
| 4. | ohms. See the Wiring Diagram. | ||
| installed, remove it and replace |
| Check leads #221 and #222 | |||
| the Jumper in connector |
|
| between the output shunt and | ||
| the machine functions normally, |
|
| the control board. | See the | |
| the Advanced Process panel or |
|
| Wiring Diagram. |
| |
| harness is defective. |
|
| 5. The control board may be faulty | ||
Accessories plugged into the volt 1. Make sure | the accessory plug | 1. | The circuit breaker (CB1) may be | |
receptacle do not work. | and associated leads are in good | 2. | faulty. | |
2. | working condition. | Check the receptacle and asso- | ||
Make certain the correct input |
| ciated leads for loose or faulty | ||
| voltage is being applied to the | 3. | connections. | |
| machine. | (The reconnect lead | Perform the T1 Transformer | |
3. | must be in the correct position.) |
| Test. | |
The circuit breaker CB1 may be |
|
| ||
4. | tripped. Reset if necessary. |
|
| |
Only the top part of the recepta- |
|
| ||
| cle is electronically “Hot” all of |
|
| |
| the time. |
|
|
|
Return to Section TOC Return to Master TOC
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
