E-3
TROUBLESHOOTING
E-3
CV-250
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
Machine has no output.
Machine has minimum output and no
control.
Machine has low output and no con-
trol.
1. Secondary contactor circuit (2
and 4 wire feeder receptacle) not
working.
2. Electrode or work lead loose or
broken.
3. Defective PC Board.
4. Protective circuits operating due
to output short circuit.
5. If using an LN-25, K484 jumper
plug kit not making connection
between 2 & 4 in wire feeder
receptacle.
6. If welding with 1/16" aluminum
wire and machine is flashing E00.
1. Voltage Control misconnected.
1. Open in feedback circuitry.
2. Faulty PC Board.
3. Voltage Adjust potentiometer
circuit open (lead 75).
1. Check 2 and 4 circuit wiring.
2. Repair connection.
3. See PC Board Troubleshooting
Procedure.
4. Turn power off. Remove output short
circuit.
5. Check for continuity between pins C
& D in the K484.
6. a) Turn power off to clear error. Use
recommended wfs, voltage set-
tings and angle of approach of
wire to work.
b) If problem still persists, call Local Lincoln
Authorized Field Service Facility.
1. Voltage Control wiring.
1. Check wiring and control and PC
board wiring harness plugs.
2. See PC Board Troubleshooting
Procedure.
3. Check and replace potentiometer if
faulty. Check wiring of lead #75.
MACHINE TROUBLESHOOTING GUIDE
Not all trouble conditions can be recognized by the PC board, and displayed as error codes. The following guide
covers most other trouble conditions.
