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TROUBLESHOOTING & REPAIR
F-4 F-4
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
Major physical or electrical damage
is evident when the sheet metal
cover(s) are removed.
1. Contact your local authorized
Lincoln Electric Field Service
Facility for assistance.
1. Contact the Lincoln Electric
Service Department,
1-888-935-3877.
The LN-15 does not “power-up”
when the on/off switch is turned to
the ”ON”position.
1. Make sure the correct input volt-
age is being applied (15 to
110VDC). See Specifications
Pages.
2. Make certain the “Work Clip” is
attached securely to the work
piece.
1. Check the on/off switch. See
the wiring diagram.
2. Check the input rectifier bridge.
See the wiring diagram.
3. Perform the Boost Power
Supply Board Test.
4. The control board may be faulty.
5. If the Display Board is not lit
check the input voltages to the
Display Board. See the Wiring
Diagram.
When the gun trigger is activated
the wire drive runs and electrode
wire feeds, but there is no welding
output.
1. Make sure the contactor is func-
tioning correctly.
2. Check the current carrying leads
at the contactor and between
the contactor and the feed plate
for loose or faulty connections.
See the Wiring Diagram.
3. Make sure the welding gun is
connected correctly and func-
tioning correctly.
4. Make certain the DC power
source is functioning correctly.
1. Perform The Contactor Test.
2. The Control Board may be faulty.
LN-15
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
1-888-935-3877.
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.