Lincoln Electric RANGER 250 SVM150-A Service Manual page 55

F-5
TROUBLESHOOTING GUIDE
PROBLEMS
(SYMPTOMS)
No welding output in all modes.
The engine operates normally. The
auxiliary output is normal.
(continued)
No welding output in all modes.
Also no auxiliary power.
engine operates normally
approximately 3700 RPM.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Check the brushes for wear and
The proper contact to the rotor slip
at rings.
2. Make sure the engine is operat-
ing at the correct high idle
speed (3700 RPM).
3. Check for loose or faulty con-
nections or leads at the auxiliary
output receptacles and/or the
welder output terminals.
the Wiring Diagram.
CAUTION
RANGER 250
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
5. Perform the Stator Voltage
Test.
6. Perform the Output Rectifier
Bridge Test.
7. Perform the Power Module
Test.
8. Perform the Analog Power
Board Test.
9. Check the
potentiometer and associated
wiring.
10. The Control Board may be
faulty.
1. Perform the Rotor Resistance
Test.
2. Perform the Flashing and
Rotor Voltage Test.
"flashing" voltage is not present,
the battery board or leads #201
or #200 may be faulty. See the
Wiring Diagram.
sure that lead #5H has continu-
ity (zero ohms) to ground.
See
3. Check the field diode and
capacitor. Replace if neces-
sary.
4. Perform the Stator Voltage
Test.
F-5
output control
If the
Also, make