Troubleshooting Guide - Lincoln Electric LN-9 SVM127-A Service Manual

F-4
Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
No wire feed when gun trigger is
activated. The digital meter does
NOT light. The drive rolls do not
turn.
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.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS
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. The wire drive motor may be
over heated, and the thermal
protector has tripped. Let unit
cool.
CAUTION
LN-9 Wire Feeder

TROUBLESHOOTING GUIDE

RECOMMENDED
COURSE OF ACTION
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
Transformer Test.
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.
F-4
T1
the