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TROUBLESHOOTING & REPAIR
F-13 F-13
LN-9 Wire Feeder
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
The 1/8 amp fuse on the voltage
PC board repeatedly fails.
1. Check to make sure the PC
boards are NOT grounded to
the case of the LN-9. This can
happen due to metallic wire
shavings build-up.
1. Remove input power to the LN-
9. Replace the 1/8 amp fuse
and switch the LN-9 polarity
switch to the "NEG" position.
Make a resistance check from
the following leads to the LN-9
case grounding screw: Lead #
500, 510, 525, 522, 526, 530,
and 628.
The resistances should be
above 1000 ohms. If any test
is below 1000 ohms, that circuit
has low resistance to case
ground. Isolate the faulty leads
or PC board. See the Wiring
Diagram and Schematic.
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.