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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 | RECOMMENDED |
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| (SYMPTOMS) |
| MISADJUSTMENT(S) | COURSE OF ACTION |
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| FEEDING PROBLEMS |
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Meter reads low voltage | Local/Remote Switch must be in | 1. | See Output Diodes test. |
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and output is extremely low or no | LOCAL position unless Remote |
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output. |
| Control device is attached to remote | 2. | See Capacitor Balance | tests. | |
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| receptacle. |
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| 3. | See Switch Board test. |
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| 4. | See Power Board test. |
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| 5. | Control Board may be defective. | |
Poor welding, weld settings drift, or | Check welding procedures and weld | 1. | Check Mode Switch S2 for dam- | ||
output power is low. | cable connections. |
| age and continuity. |
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| Check with machine on local con- |
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| trol. | 2. | Check | for continuity | between |
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| Mode Switch S2 and Control | ||
| Check input voltages and input volt- |
| Board. See Wiring Diagram in | ||
| age reconnect procedures. See |
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| Installation section of this manual. |
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| 3. | Check for loose or faulty con- | ||
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| nections in heavy | ||
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| ing leads (i.e., choke, shunt, | ||
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| output | bridge, and | output |
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| studs). See wiring diagram in | ||
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| Section G. |
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4. See Overcurrent Protection Current Trigger Circuit tests.
5. See Control Board test
Welding “too hot”. Actual weld cur- | Check condition of the shunt and | See Step 7 of the Overcurrent |
rent is considerably higher than dis- | leads to the Control Board. | Protection Current Trigger test |
play indicates. |
| If shunt and leads check OK, possi- |
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| ble defective Control Board |
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
