Lincoln Electric VANTAGE 400 Service Manual page 66

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Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS
(SYMPTOMS)
The engine will not idle down to
low RPM. The machine has nor-
mal weld and auxiliary output.
(continued)
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)
OUTPUT PROBLEMS
CAUTION
VANTAGE® 400
RECOMMENDED
COURSE OF ACTION
Manually move the idle solenoid
plunger to the idle position. If the
solenoid engages and holds in the
idle position, the idle pull coil may
be bad.
If the solenoid does not hold in the
low idle position, remove plug P6
from the control PC Board and
wait about 30 seconds.
If the engine drops to low idle
check for damage or buildup of
conductive material on or around
the bypass filter assembly and the
output terminals. See wiring dia-
gram.
If the engine still does not drop to
low idle the control PC Board is
probably defective. Replace it.
Check that leads #3 and #6 are
properly routed through the
toroidal current sensor.
Each lead must have two turns
and must pass through the sensor
in the opposite directions. See
the wiring diagram. The leads
should be wrapped tightly and tie
wrapped in place.
Check the toroidal current sensor
for any signs of damage.
Check leads #260 and #261 for
poor connections and damage to
the conductors and insulation
between the toroid current sensor
and the P3 connector in the con-
trol PC Board.
Unplug plug P3 from the control
PC Board and check for damaged,
dirty, or corroded pins.
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