| TROUBLESHOOTING |
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| Observe all Safety Guidelines detailed throughout this manual |
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PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
Machine input contactor does not | 1. Supply line fuse is blown. | |
operate. | 2. Contactor power circuit has an | |
(White Power light off) |
| open lead. |
| 3. | Broken power lead. |
| 4. | T2 internal thermal breaker open |
| 5. Defective POWER ON/OFF | |
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| Switch (S1). |
| 7. | Control circuit diode bridge open |
| 8. | Transformer iron rear thermostat open. |
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(White Power light on) | 1. Open input contactor coil. | |
| 2. | Defective Control Board. |
| 3. | Contactor moving iron binding. |
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Machine input contactor operates, | 1. Electrode or work lead loose or | |
but no output when trying to weld. |
| broken. |
| 2. Open main transformer (T1) pri- | |
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| mary or secondary circuit. |
| 3. Firing P.C. board not connected | |
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| or is faulty. |
| 4. | Firing board not getting enable |
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| signal. |
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Machine does not have maximum | 1. One input fuse blown. | |
output. | 2. One phase of main transformer | |
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| (T1) open. |
| 3. | Faulty Control or Firing P.C. |
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| boards. |
| 4. | Faulty SCR bridge. |
| 5. | Input voltage too low. |
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Machine has output only momentarily | 1. Machine has either an internal or | |
after contactor closes.Output returns |
| external short circuit on the output. |
momentarily every 75 seconds. | 2. Faulty Control PC board. | |
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Machine has output only momen- | 1. Output voltage peaks are too | |
tarily, contactor opens immediately |
| high because input voltage too |
after closing. (Green Safe Output |
| high. |
light off) | 2. Output voltage peaks are too | |
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| high because output filter circuit |
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| not working. |
| 3. | Output voltage peaks are too |
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| high because control circuit isn’t |
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| sensing output voltage. |
| 4. | Control board faulty. |
| 5. | Output SCR shorted. |
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Machine output doesn’t stay on. |
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(Amber Thermal light on, fan run- | 1. Machine is overloaded. | |
ning, digital Output display reads |
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greater than 100). |
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If all recommended possible areas of misadjustment have been checked and the problem persists,
Contact your local Lincoln Authorized Field Service Facility.
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.