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TROUBLESHOOTING & REPAIR
F-21 F-21
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
Voltage seems to be too high or the
arc flares at the start of weld.
Welding is good.
1.
Adjust the "start" trimmer on the
voltage PC board. It should be
only slightly higher than the weld
voltage. See
Starting Charac-
teristics
in the
Operation
section
of this manual.
2. 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 correct volt-
age cannot be set, the power
source may be faulty.
3. Check for correct control cable
connections to the power
source.
1. The LN-9 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.