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F-8 F-8
POWER MIG 350MP
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TROUBLESHOOTING & REPAIR
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely,
contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call
1-888-935-3877.
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENT(S)
RECOMMENDED
COURSE OF ACTION
WIRE FEEDING PROBLEMS
No control of wire feed speed.
Other machine functions are nor-
mal.
1. The wire feed speed encoder
control may be dirty. Rotate sev-
eral times and check if problem
is resolved.
1. Perform the Wire Drive Motor
and Tachometer Feedback
Test.
2. The Wire Speed Encoder may
be faulty. Perform Encoder
Test.
3. The Feeder Head Board may be
faulty. Replace.
There is no wire feed when gun
trigger is pulled. Normal open cir-
cuit voltage is present.
1. Check for wire jam at drive rolls.
2. If the drive rolls are turning then
check for a mechanical restric-
tion in the wire feed path.
3. The gun liner may be clogged.
Check or replace.
1. Perform the Wire Drive Motor
and Tachometer Feedback
Test.
2. The Wire Speed Control
Encoder may be faulty. Perform
Encoder Test
3. The Feeder Head Board may be
faulty. Replace.
CAUTION
Observe Safety Guidelines
detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE
The machine stops feeding wire
while welding.
1. Check for adequate wire supply.
2. Check for mechanical restric-
tions in the wire feeding path.
The gun may be clogged.
3. Make sure the gun liner and tip
are correct for wire size being
used.
4. Check spindle for ease of rota-
tion.
5. Check to see if the spot timer
has been activated.
1. Check the motor armature cur-
rent. Normal armature current is
2.0 to 2.7 amps maximum. If the
motor armature current is normal
the Feeder Board may be faulty.
Replace.
2. If the motor armature current is
high (over 2.7 amps) and there
are NO restrictions in the wire
feeding path then the motor or
gear box may be defective.
Replace.