Lincoln Electric NA-5N Service Manual page 66

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
Only the strike mode functions, when
the unit is at idle, regardless of the
selector switch position.
Only the strike mode functions while
welding. The unit stays in the strike
mode and does not progress through
the welding sequence.
The strike light is OFF and neither
strike control functions. The other
mode lights work. The unit will not
feed wire when the start button is
pressed.
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)
MODE FUNCTION PROBLEMS
1. The logic board may be faulty.
Replace.
2. The procedure board may be
faulty.
1. While the unit is welding check
light 7D on the logic board. It
should be ON when welding cur-
rent is present. If light 7D is ON
the logic board may be faulty.
3. If light 7D is NOT lit when weld
current is present make sure the
weld cables have been properly
routed through the cable clamp
on the left side of the control box.
1. Check light 7D on the logic board.
If it is off the logic board may be
faulty. Replace.
2. If the start light is on all the time
the start board (if used) may be
faulty. Replace or install jumper
plug in procedure board.
3. If the crater light is on all the time
the crater board (if used) may be
faulty. Replace or install jumper
plug in procedure board.
4. If the weld light is on all the time
the logic board may be faulty.
Replace.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
. If light 7D is NOT lit, when weld
current is present, connect a
jumper wire from terminal #528 to
#500 on terminal strip TS1. See
wiring diagram. If light 7D does
light check the CR4 reed switch
and associated leads and connec-
tions. See wiring diagram.
2. If 7D does NOT light, with the
jumper wire in place, check the
#528 lead and the #500 lead
between the TS1 terminal strip
and the logic board. See wiring
diagram.
3. The logic board may be faulty.
Replace.
1. If light 7D is ON check the CR4
reed switch and associated leads.
See wiring diagram.
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