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TROUBLESHOOTING & REPAIR
F-6 F-6
RANGER 250
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
OUTPUT PROBLEMS
No auxiliary power at the recepta-
cles. The welding output is normal
and the engine operates normally.
1. The circuit breakers may be
tripped. Reset if necessary.
2. Check for loose or faulty con-
nections at the auxiliary recep-
tacles.
1. Check the wiring between the
auxiliary receptacles, the con-
nection studs, and the main sta-
tor. See the Wiring Diagram.
2. Perform the Stator Voltage
Test.
The machine has welding output
but no control of output in some or
all modes. The auxiliary power is
normal.
1. If a remote control unit is con-
nected, check the remote control
and related cable.
2. Check the welding and work
cables for loose or faulty con-
nections.
1. Check the OUTPUT control
potentiometer and related
leads. See the Wiring Diagram.
2. Check the shunt and associated
feedback leads. See the Wiring
Diagram.
3. Check the voltage feedback
leads for loose or faulty connec-
tions. See the Wiring Diagram.
4. Perform the Power Module
Test.
5. The Control Board may be
faulty.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE