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TROUBLESHOOTING & REPAIR
F-4 F-4
LN-9 Wire Feeder
Observe Safety Guidelines TROUBLESHOOTING GUIDE
detailed in the beginning of this manual.
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.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FUNCTION PROBLEMS
No wire feed when gun trigger is
activated. The digital meter does
NOT light. The drive rolls do not
turn.
1. Make sure 115VAC is being
applied to the LN-9 at the input
connector. Pin "C" is lead #31
and pin "D" is lead #32.
2. Check the 5 amp circuit breaker.
Reset if tripped.
3. The F101 1/2 amp fuse, located
on the power PC board, may be
blown.
1. Check for loose or faulty lead
connections between the input
connector, the T1 transformer,
and the power PC board.
2. The T1 transformer may be
faulty. Perform the
T1
Transformer Test.
No wire feed when gun trigger is
activated. The digital meter DOES
light but reads zero in both (set and
actual) volts and wire speed.
1. The wire drive motor may be
over heated, and the thermal
protector has tripped. Let unit
cool.
1. Check for loose or faulty con-
nections on leads #527 and
#528 between the wire drive
motor and the power PC board.
2. Perform the
T1 Transformer
Test.
Replace if faulty.
3. The power PC board may be
faulty. Replace.