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TROUBLESHOOTING & REPAIR
F-12 F-12
RANGER 250
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If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-800-833-9353.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WELDING PROBLEMS
The welding arc is “cold.” The
engine runs normally. The auxiliary
power is normal.
1. Check for loose or faulty con-
nections at the weld output ter-
minals and welding cable con-
nections.
2. The welding cables may be too
long or coiled, causing an
excessive voltage drop.
3. Make sure the electrode (wire,
gas, voltage, current etc.) is
correct for the process being
used.
1. Check for the correct OCV at
the welding output terminals. If
the correct voltage is present at
the output terminals, check for
loose connections on the heavy
current carrying leads inside the
Ranger 250. See the Wiring
Diagram.
2. If the OCV is low at the welder
output terminals, perform the
Engine Throttle Adjustment
Test.
3. Perform the Output Rectifier
Bridge Test.
4. Perform the Stator Voltage
Test.
5. Perform the Power Module
Test.
6. The Control Board may be
faulty.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE