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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | ||||||||
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| detailed in the beginning of this manual. |
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| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| FEEDING PROBLEMS |
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| No wire feed when gun trigger is |
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| 1. If the wire drive motor is running |
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| 1. Check for a DC voltage at wire |
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| pulled. Fan runs, gas flows and |
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| check to see if the correct wire |
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| drive motor armature (leads |
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| machine has correct open circuit |
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| is in the machine. |
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| #539 to #541). The voltage |
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| voltage (28 vdc maximum) – weld |
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| should be between 2 vdc and 10 |
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| output. |
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| 2. If the wire drive motor is running |
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| vdc. This voltage will vary with |
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| make sure that the correct drive |
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| the wire speed control setting. If |
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| rolls are installed in the |
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| the correct voltage is present, |
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| machine. |
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| the drive motor may be faulty. |
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| Replace. See wiring diagram. |
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| 3. Check for clogged cable liner or |
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| feeding problems. |
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| 2. If the motor armature voltage is |
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| not present, then check for OCV |
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| at leads #203 (3J2) and #204 |
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| (4J2) on the control board. If |
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| correct voltage is present, go to |
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| Step 3. If OCV is not present at |
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| leads #203 and #204, check |
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| continuity (zero ohms) of leads. |
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| 3. If the motor armature voltage is |
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| not present, then check the wire |
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| speed control potentiometer and |
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| associated wires #208, #209 |
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| and #203 for faulty connections. |
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| 4. The control board may be faulty. |
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| Replace. |
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| Wire feed speed motor runs very |
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| 1. Make sure that the wire speed |
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| 1. Remove main supply power to |
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| fast. Weld output, gas flow and fan |
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| control is not set at maximum. |
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| machine. Disconnect plug J2 |
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| operate normally. |
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| from the control board. Test the |
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| resistance from lead #539 (2J2) |
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| in the harness plug to the wire |
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| feed motor case. If the resis- |
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| tance is below 500,000 ohms, |
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| replace the drive motor. |
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| 2. Check the wire speed control |
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| potentiometer and associated |
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| wires #208, #209 and #203 for |
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| loose or broken connections. |
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| 3. The control board may be faulty. |
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| Replace. |
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CAUTION
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call
