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TROUBLESHOOTING & REPAIR
F-5 F-5
TROUBLESHOOTING GUIDE Observe Safety Guidelines
detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
FEEDING PROBLEMS
When the gun trigger is activated
there is no wire feed.
1. Check to see if the drive rolls
are turning when the gun trigger
is pulled. If the drive rolls are
turning, then check for a
mechanical restriction in the
wire feed path.
2. If the drive rolls do not turn
then check to make sure the
correct DC voltage is being
applied to the LN-15. (15-
110VDC).
3. Make sure the gun trigger is
functioning correctly.
1. With the gun trigger circuit acti-
vated (see the Wiring Diagram)
and the LN-15 set for constant
voltage operation, check the
presence of 2.6 to 27.4VDC at
leads 550+ to 551-. This is the
voltage that is applied to the
wire drive motor. This voltage
is dependent upon the wire
feed speed setting.
2. If the correct voltage is being
applied to the drive motor and
the motor does not run the
motor or motor brushes may be
faulty.
3. If the correct voltage is not
being applied to the drive
motor the Control Board may
be faulty.
The wire feeds for a short period
of time but then stops feeding.
When the gun trigger is released
then re-activated the wire resumes
feeding but soon stops again.
1. The drive motor may be over-
loaded. Check the wire feed-
ing path for mechanical restric-
tions.
2. While welding make certain the
power source arc voltage is
staying above 15VDC. The
feeder will not function properly
on less than 15VDC.
1. Check the motor armature cur-
rent through either of the arma-
ture leads (550 or 551). It
should not exceed 3.5 amps
DC.
2. If more than 3.5 amps is indi-
cated, then the motor is draw-
ing too much current. Check or
replace the motor brushes.
3. If less than 3.5 amps is indicat-
ed and the motor is being dis-
abled by the Control Board,
then the Control Board may be
faulty. Replace.
4. The motor or gearbox may be
faulty. Replace.
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.