Lincoln Electric NA-5N Service Manual page 68

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
When the start button is pressed and
the unit is welding, the start mode is
skipped.
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. Make sure the start option is in-
stalled properly in the NA-5.
2. Make sure the start timer is set
for a time greater than zero sec-
onds.
3. If the weld light goes ON as soon
as (but not before) the arc is
struck and the start timer is set
for a time greater than zero sec-
onds, the start timer board may
be faulty.
4. If the weld light goes ON before
the arc is struck replace the start
option board with the jumper
plug. If the weld light continues
to go ON before the arc is struck
the logic board may be faulty.
Replace.
5. With the jumper plug installed: If
the weld light does NOT go ON
until the arc is struck the start
option board may be faulty.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
1. Check the lead harness between
the start option boards and the
procedure board for loose or
faulty connections. See wiring
diagram.
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