Lincoln Electric SVM138-A Service Manual page 97

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ELECTRIC SHOCK can kill.
6. Apply 115 VAC power.
7. With the gun trigger activated or the gun ter-
minals jumpered together (see the Wiring
Diagram), check the motor armature volts at
leads #541(+) and #539(-). Normal is 5 to
95VDC depending on the wire feed speed
setting. As the armature voltage is increased
the wire feed speed should increase.
TROUBLESHOOTING & REPAIR
WIRE DRIVE MOTOR TEST (continued)
WARNING
• With power
there are high voltages
inside the wire feeder.
Do not reach into the
wire feeder or touch any
internal part of the wire
feeder while power is
applied.
LN-9 GMA Wire Feeder
8. If the above voltages are present and the
motor does not operate, the motor, motor
brushes or gear box may be faulty.
If the armature voltage is missing or not cor-
applied,
rect, the power board or 1CR relay may be
faulty.
If the motor is running at high speed and the
armature voltage is high and uncontrollable,
proceed with the Hall Effect Module Test.
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