Lincoln Electric Cross Country 300 Service Manual page 20

LINCOLN ELECTRIC
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine welds but it will
not maintain a steady output.
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 1-888-935-3877.
POSSIBLE AREAS OF
MISADJUSTMENT(S)
OUTPUT PROBLEMS
1. Check that the electrode is
of good quality, dry and free
from contamination. Try using
some Lincoln electrode and
setting the machine per
Lincoln's recommendation.
2. If shielding gas is used, check
that the gas and gas flow are
correct. Check for damaged,
pinched or leaking gas lines.
3. Check for proper work and
electrode leads and
connections (size, length, coils
or bad connections).
CAUTION
Cross Country™ 300 Service Manual
TROUBLESHOOTING GUIDE
RECOMMENDED
COURSE OF ACTION
1. If the engine will not
maintain the correct load RPM,
the engine may be in need of
service. Air and fuel filters
should be checked.
2. Check large current carrying
leads that connect to the
stator, chopper module, shunt,
choke and output terminals.
See Wiring Diagram. Look for
damaged conductors or faulty
connections.
3. Check the connections at the
control board and the chopper
module.
4. The output control or the
arc control potentiometer may
be defective or grounded. The
mode switch may also be
faulty. Perform the Weld Mode
Selector Switch Test Procedure.
5. Perform the Chopper
Module Function Test
Procedure.
6. Perform the Output Rectifier
Bridge Test Procedure.
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