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TROUBLESHOOTING & REPAIR |
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TROUBLESHOOTING GUIDE |
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| Observe Safety Guidelines | |||
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| detailed in the beginning of this manual. | ||||
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PROBLEMS |
| POSSIBLE AREAS OF |
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(SYMPTOMS) |
| MISADJUSTMENT(S) |
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| COURSE OF ACTION | ||||||
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| METER FUNCTION PROBLEMS |
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SET volts and actual volts readings |
| 1. | Put the Lincoln power source in |
| 1. Check the voltage sensing | ||||||
match within a few tenths of a volt |
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| the "Machine | Control" | mode. |
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| leads for continuity (zero ohms). | |||
while welding. However, both read- |
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| Check to see if the power |
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| Lead #21 should have continu- | |||||
ings are inaccurate. |
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| source can be set for the arc |
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| ity to the work piece, and #67 | |||||
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| voltage required for the process. |
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| should have continuity to the | |||||
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| If not, the power source may be |
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| brass conductor block. See the | |||||
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| faulty. |
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| Wiring Diagram. | |
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| 2. | The control cable may be faulty. |
| 2. Perform the Meter Circuit | ||||||
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| Check or replace. |
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| Accuracy Test. | |||
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| 3. The voltage PC board may be | ||
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| faulty. Replace. | |
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The actual volts reading does NOT |
| 1. | Make sure |
| the | shutdown |
| 1. | If the actual reading is the prob- | ||
match the SET volts reading within |
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| "BYPASS" | pins | are | NOT |
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| lem, check the actual volts | ||
a few tenths of a volt while welding. |
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| jumpered together on the |
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| switch and associated leads. | |||||
One reading may be erratic. The |
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| GMA voltage PC board. |
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| 2. | If the SET reading is the prob- | ||||
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| 2. Check the | voltage sensing |
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| lem, check the set volts switch | ||||||
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NOTE: The Pulse Power Filter kit |
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| leads for continuity (zero ohms). |
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| and the associated leads. | |||||
may slow down the shutdown fea- |
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| Lead #21 should have continu- |
| 3. Check the | ||||||
ture. |
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| ity to the work piece, and #67 |
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| switch and associated leads. | |||||||
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| should have continuity to the |
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| brass conductor block. See the |
| 4. | The voltage PC board may be | |||||
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| Wiring Diagram. |
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| faulty. Replace. | |||
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| 3. Put the Lincoln power source in |
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| the "Machine | Control" | mode. |
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| Check to see if the power sup- |
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| ply can be set for the arc volt- |
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| age required for the process. If |
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| not, the power supply may be |
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| faulty. |
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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
