Trouble |
| Cause |
| What To Do |
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|
Machine has low output and no con- | 1. | Output Control | 1. | Check position of switch. |
trol. |
| switch (S2) in wrong position. |
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| 2. | Output Control switch faulty. | 2. | Check switch and replace if |
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|
|
| faulty. |
| 3. | Open in feedback circuitry. | 3. | Check wiring and control PC |
|
|
|
| Board wiring harness plugs. |
| 4. | Faulty Control PC Board. | 4. | Replace. See Procedure for |
|
|
|
| Replacing PC Boards. |
| 5. | Output control potentiometer cir- | 5. | Check and replace potentiometer |
|
| cuit open (Lead 75). |
| if faulty. Check wiring of Lead |
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|
|
| #75. |
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|
Machine does not have maximum | 1. | One input fuse blown. | 1. | Check and replace if blown after |
output. |
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|
| checking for reason for blown |
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| fuse. |
| 2. | One phase of main transformer | 2. | Check for open and repair. |
|
| open. |
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|
| 3. | Faulty Control PC Board. | 3. | Replace. See Procedure for |
|
|
|
| Replacing PC Boards. |
| 4. | Output control potentiometer | 4. | Check and replace if faulty. |
|
| defective. |
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|
| 5. | Output control potentiometer | 5. | Check and repair broken leads. |
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| Leads 210, 211, or 75 open. |
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|
Machine will not shut off. | 1. | Input contactor contacts frozen. | 1. | Check and replace if necessary. |
| 2. | Defective Power “I/O” | 2. | Replace. |
|
| switch, (S1). |
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Variable or sluggish welding arc. | 1. | Poor work or electrode connec- | 1. | Check and clean all connections. |
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| tion. |
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| 2. | Welding leads too small. | 2. | Check table in instruction manual. |
| 3. | Welding current or voltage too | 3. | Check procedures for recom- |
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| low. |
| mended settings. |
| 4. | Defective main SCR bridge. | 4. | Check and replace if defective. |
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|
Output control not functioning on the | 1. | Output Control | 1. | Place switch in “Local”. |
machine. |
| switch (S2) in wrong position. |
|
|
| 2. | Faulty Output Control switch. | 2. | Check and replace if found faulty. |
| 3. | Faulty Output Control potentiometer. | 3. | Check and replace if found faulty. |
| 4. | Leads or connections open in | 4. | Check lead continuity and con- |
|
| control circuit. |
| nections for an open and repair if |
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|
|
| necessary. |
| 5. | Faulty Control PC Board. | 5. | Replace. See Procedure for |
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|
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| Replacing PC Boards. |
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