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| TROUBLESHOOTING & REPAIR |
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| Observe Safety Guidelines |
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| TROUBLESHOOTING GUIDE | ||||||||
| detailed in the beginning of this manual. |
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| PROBLEMS | POSSIBLE AREAS OF | RECOMMENDED |
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| (SYMPTOMS) |
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| MISADJUSTMENT(S) |
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| COURSE OF ACTION |
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| OUTPUT PROBLEMS |
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| No weld output when gun trigger is |
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| 1. Arc voltage may be set too low. |
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| 1. Check for open circuit voltage |
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| pulled. Fan runs, gas flows and |
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| (OCV) at the machine’s output |
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| wire feeds normally. |
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| 2. Gun tip may be worn – Replace. |
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| terminals, located in wire drive |
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| compartment. Normal OCV is |
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| 3. Check for correct input voltage |
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| from 10 vdc to 28 vdc depending |
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| to machine. |
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| on arc voltage control setting. If |
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| correct OCV is present, check |
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| 4. Gun or work cable may be |
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| gun and work cable. |
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| faulty. |
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| 2. If correct OCV is not present at |
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| the output terminals, then check |
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| for broken leads at the output |
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| choke or at the positive output |
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| terminal. |
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| BELOW CODE 9794 ONLY |
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| 1. Check the circuit breaker locat- |
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| 1. Remove main power supply to |
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| ed in the machine’s wire drive |
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| No wire feed, weld output or gas |
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| compartment. Reset if tripped. |
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| check for continuity (zero ohms) |
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| flow when gun trigger is pulled Fan |
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| from 8J2 (lead #213) to 9J2 (lead |
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| operates normally. |
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| 2. The thermostat may be tripped |
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| #211 ) at harness plug. If zero |
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| due to overheating. Let machine |
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| ohms is indicated, then trigger |
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| cool. Weld within the duty cycle |
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| circuit is OK. See wiring diagram |
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| or remove any air obstruction to |
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| and Figure F.1. |
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| machine. |
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| 2. If an open circuit or high resis- |
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| 3. Wire feed motor may be over- |
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| tance is indicated in Step 1, then |
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| loaded. Correct feeding prob- |
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| check leads #211,#212 and #213 |
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| lem. |
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| for loose or broken connections. |
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| Also check the normally closed |
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| 4. Gun trigger may be faulty. |
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| thermostat mounted on the diode |
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| heat sink assembly. See wiring |
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| diagram. |
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| 3. Check for 115 vac at lead #31A |
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| to plug 3J1 on control board. If |
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| 115 vac is NOT present, remove |
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| main supply power to machine. |
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| Test continuity (zero ohms) of |
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| leads #32 and #31A. See Figure |
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| F.1. |
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| 4. If 115 vac is present at lead |
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| #31A to plug 3J1 (lead #32), then |
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| control board may be faulty – |
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| Replace. See Figure F.1. |
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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 the Lincoln Electric Service Department for technical troubleshooting assistance before you proceed call