Lincoln Electric POWER MIG SVM167-A Service Manual page 44

F-8
TROUBLESHOOTING AND REPAIR
Troubleshooting Guide –
components and for troubleshooting of specific circuits.
PROBLEMS
(SYMPTOMS)
Rough wire feeding or the wire will
not feed but the drive rolls are turn-
ing.
No control of wire feed speed.
Other machine functions are nor-
mal.
There is no wire feed when the gun
trigger is activated. Normal open
circuit weld voltage is present and
the gas solenoid functions normally.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact the
Lincoln Electric Service Department for technical troubleshooting assistance before you proceed. Call 1-888-935-3877
See Wiring Diagrams for location of specified
POSSIBLE AREAS OF
MISADJUSTMENT(S)
WIRE FEEDING PROBLEMS
1. The gun cable may be kinked or
twisted.
2. Check the drive roll tension and
the position of the grooves.
3. Electrode may be rusted or dirty.
4. The contact tip may be damaged
or not the correct size.
5. Check the wire spindle for ease of
rotation.
6. Make certain the gun is pushed all
the way into the gun mount and
properly seated.
1. The wire feed speed control may
be dirty. Rotate several times
and check if the problem is
resolved.
1. Check for adequate wire supply.
2. If the drive rolls are turning,
check for a mechanical restriction
in the wire feed path.
3. The gun liner may be clogged.
Check or replace.
4. If the drive rolls are not turning
when the gun trigger is activated,
contact your local Lincoln Electric
Authorized Field Service Facility.
CAUTION
POWER MIG® 215
Observe Safety Guidelines
detailed in the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. The wire speed control potentiometer
may be faulty. Check or replace.
Normal potentiometer resistance is
10K ohms.
2. Perform the Wire Drive Motor and
Wire Speed Potentiometer Test.
3. The control board may be faulty.
1. Perform the Wire Drive Motor and
Wire Speed Potentiometer Test.
2. The wire speed control potentiometer
may be faulty. Check or replace.
Normal potentiometer resistance is
10K ohms.
3. The control board may be faulty.
F-8