Lincoln Electric NA-5N Service Manual page 73

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The start button does not initiate the
power source output or the wire
feed. The mode selector switch is in
the strike position and the mode
strike light is lit.
The start button initiates the power
source output, but the wire does not
feed.
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 216-383-2531 or 1-800-833-9353.
TROUBLESHOOTING & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
FUNCTION PROBLEMS
1. If the crater and or start option
boards are NOT used the jumper
plugs must be installed in the pro-
cedure board receptacles.
2. With the unit at idle check light 7C
on the logic board. It should be
OFF. Also check light 7B on the
logic board. With the start button
pressed light 7B should go ON. If
lights 7C and 7B are functioning
normally the logic board may be
faulty.
1. If the wire inches up properly, but
does not feed when the start but-
ton is pressed, the logic board
may be faulty.
2. If the wire does NOT feed, when
the inch up button is pressed,
check light 1E on the power
board. It should go ON when the
inch up button is pressed. If light
1E does not go on when the inch
up button is pressed the control
board may be faulty.
3. The power board may be faulty.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
1. If light 7C is ON check the stop
button and associated leads for
"shorts" or "grounds". Light 7C
should be on ONLY when the
stop button is pressed.
2. If light 7B does NOT go on, when
the start button is pressed, check
the start switch (button) and asso-
ciated leads for loose or faulty
connections. See wiring diagram.
3. Check the lead harness between
the logic board and the procedure
board for loose or faulty connec-
tions. See wiring diagram.
1. If the wire does not feed when the
inch up button is pressed perform
the Wire Drive Motor Test.
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