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| TROUBLESHOOTING & REPAIR |
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| TROUBLESHOOTING GUIDE | Observe Safety Guidelines | |
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| detailed in the beginning of this manual. | |
PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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(SYMPTOMS) | MISADJUSTMENT(S) | COURSE OF ACTION |
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| TIG MODE PROBLEMS |
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Weak high frequency – machine | 1. | The spark gap may be misad- | 1. | Make sure that 115VAC is |
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has normal welding output. |
| justed. Check and reset per |
| being applied to the primary of |
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| maintenance instructions. |
| the high voltage transformer |
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| 2. Improper shielding gas flow. |
| (T3). See Wiring Diagram. |
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| Adjust for a flow of 10 to 30 | 2. | Check for an open or arcing |
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| CFH (4.7 to 14.1 l/min.) for |
| high frequency component. |
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| most applications. |
| Replace as required. |
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| 3. Work and electrode cables |
| (Examples: R6, C6, C3, R4) |
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| may be in poor condition, | 3. | If spark is weak at the spark |
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| allowing the high frequency to |
| gap, check or replace the high |
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| “leak off.” Use good quality |
| frequency circuit. (Examples: |
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| cables with a high natural rub- |
| T3, L4, L5). |
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| ber content, such as Lincoln |
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| Stable Arc Cable. Cables |
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| should be as short as possible. |
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Lack of penetration in AC TIG | 1. | The AC Wave Balance control | 1. | Check the AC Wave Balance |
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welding. |
| may be set improperly – set- |
| control potentiometer (R12) for |
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| tings above 3 give increased |
| correct resistance and proper |
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| penetration. |
| operation. See Wiring |
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| Diagram. |
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| 2. Check leads #443 and #444 |
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| for continuity from the AC |
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| Wave Balance control poten- |
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| tiometer to the lower control |
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| panel. See Wiring Diagram. |
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| 3. Perform the SCR Rectifier |
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| Bridge Tests. |
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| 4. The control board may be |
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| 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
