Troubleshooting Guide - Lincoln Electric RANGER 250 SVM150-A Service Manual

F-4
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
Major physical or electrical damage
is evident.
No welding output in all modes.
The engine operates normally. The
auxiliary output is normal.
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. Contact your local Lincoln
Authorized
Facility.
1. Place the Welding Terminals
switch in the "WELD TERMI-
NALS ON" position. If the prob-
lem is solved, the fault may be
in the external control cable (if
used), leads #2 and #4. See
the Wiring Diagram.
2. With the engine at high idle
(3700RPM), the machine in the
Stick mode and the OUTPUT
CONTROL at maximum, check
for the presence of approxi-
mately 80VDC (open circuit
voltage) at the output terminals.
3. If the correct OCV is present at
the welding output terminals,
check the
clamps and electrode holder for
loose or faulty connections.
4. Air flow may be blocked or
restricted.
CAUTION
RANGER 250

TROUBLESHOOTING GUIDE

RECOMMENDED
COURSE OF ACTION
1. Contact the Lincoln Electric
Field Service Service Department at 1-800-
833-9353 (WELD).
1. Check for loose or faulty con-
nections on the heavy current
carrying leads between the
output bridge, the power mod-
ule, the choke, the shunt and
the output terminals.
thermostat TS1 and associated
wiring.
Diagram.
2. Check the Welding Terminals
switch and associated leads (2
and 4).
Diagram.
3. If the correct OCV is present
when the Welding Terminals
switch is in the "WELD TERMI-
welding cables, NALS ON" position, the By-
pass Board may be faulty. Also
check associated wiring. See
the Wiring Diagram.
4. Check gate leads (#23 and
#25) for loose or faulty connec-
tions. See the Wiring Diagram.
F-4
Check
See the Wiring
See the Wiring