Lincoln Electric SVM189-B Service Manual page 60

F-6
Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The machine stops feeding wire
with trigger pulled. Re-trigger
and machine starts feeding wire
again.
1. Wire drive speed stays on one
speed. No wire speed control.
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.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FEEDING PROBLEMS
1. Check for adequate wire
supply.
2. Check for mechanical
restrictions in the wire feeding
path. The gun may be clogged.
3. Make sure the gun liner and
tip are correct for the wire size
being used.
4. Check spindle for ease of
rotation.
1. Possible faulty drive motor.
2. Possible faulty Control board.
CAUTION
COMPACT WIRE WELDERS
RECOMMENDED
COURSE OF ACTION
1. Check the motor armature
current. If high (over 2.5
amps) and there are no
restrictions in the wire feeding
path, then the motor or gear
box may be faulty. Replace.
2. If motor armature current is
below 2.5 amps. The Control
P.C. board may be faulty.
Replace.
1. Remove main supply power to
the machine. Disconnect plug
J3 from the control board.
Test the resistance from lead
MOT- in the harness plug to
the wire feed motor case. If
resistance is below 500,000
ohms, replace the drive
motor.
2. If no voltage charge is seen
on MOT+ and MOT- when
turning wire speed
potentiometer, the Control
P.C. Board may be faulty.
Replace.
F-6