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TROUBLESHOOTING & REPAIR
F-22 F-22
LN-9 Wire Feeder
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TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
STARTING PROBLEMS
The arc voltage appears to rise too
slowly or stubs or blasts at the start
of a weld. Once started the weld-
ing is good.
NOTE: Pulse Power 500 operation
with a filter kit may exhibit these
symptoms.
1. Check the welding cables for
loose or faulty connections.
2. Adjust the "start" trimmer on the
voltage PC board. It should be
slightly higher than the weld
voltage.
See
Starting Charac-
teristics
in the
Operation
section
of this manual.
3. Put the Lincoln power source in
the "Machine Control" mode.
Jumper the "BYPASS" pins on
the LN-9 voltage PC board.
Adjust the weld voltage from the
power source for the process
being used. If the symptoms
persist, the power source may
be faulty.
4. Check for correct control cable
connections to the power
source.
1. If a start board is used in the
LN-9, change the jumper to
position "A." If the problem is
solved, the start board may be
faulty. Replace.
2. The voltage PC board may be
faulty. Replace.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con-
tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
216-383-2531 or 1-800-833-9353.