TROUBLESHOOTING | ||
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| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS
(SYMPTOMS)
POSSIBLE
CAUSE
RECOMMENDED
COURSE OF ACTION
3. Poor arc striking with sticking or | a. Improper procedures or tech- | a. See “Gas Metal Arc Welding | |||
| niques. | Guide” | |||
| and ropy looking bead, or elec- |
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| trode stubbing into plate while | b. Improper gas shielding. | b. Clean gas nozzle. Make certain that gas | ||
| welding. |
| diffuser is not restricted. Make certain that | ||
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| gas cylinder is not empty or turned off. | ||
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| Make certain gas solenoid valve is operat- | ||
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| ing and gas flow rate is proper. | ||
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| Remove gun liner and check rubber seal | ||
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| for any sign of deterioration or damage. Be | ||
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| sure set screw in brass connector is in | ||
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| place and tightened against the liner bush- | ||
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| ing. | ||
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4. Tip seizes in diffuser. | a. Tip overheating due to prolonged | a. Do not exceed current and duty | |||
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| or excessive high current and/or | cycle rating of gun. | ||
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| duty cycle welding. |
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| A light application of high temper- | ||
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| ature antiseize lubricant (such as | ||
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| Lincoln E2607 Graphite Grease) | ||
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| may be applied to tip threads. | ||
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5. Unit shuts off while welding and | a. See Problem 1. | a. Correct problems causing motor | |||
| “HXX” appears on display. |
| overload. | ||
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| b. Defective wire feed motor or gearbox. | b. Replace. | ||
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6. Drive roll does not turn although | a. Defective wire feed motor or con- | a. Set | |||
| arc voltage is present and sole- | trol PC board. | Disconnect wire drive plug P5 | ||
| noid is on. |
| from PC board. Measure voltage | ||
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| across pin 1 (+) of J5 and pin 2 | ||
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| of J5 on PC board with trigger | ||
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| closed. If voltage is ≥24 VDC, | ||
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| then replace motor assembly. If | ||
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| ≤24 VDC, replace Control PC | ||
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| board (see Procedure for | ||
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| replacing PC boards). | ||
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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 your Local Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.
SYNERGIC 7 & 7H
