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F-18
TROUBLESHOOTING & REPAIR
F-18
NA-5
Observe all Safety Guidelines detailed throughout this manual
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.
CAUTION
MODE FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The burnback timer does not time
out properly.
The weld light does not light. The
weld controls (voltage and wire feed
speed) may or may not function.
The NA-5 is at idle with the selector
switch in the “Weld” position.
The weld light is ON but the weld
controls (voltage and wire feed
speed) do not function. The NA-5 is
at idle with the selector switch in the
“Weld” postion.
1. Test if the other timers (start,
weld, crater) function properly. If
they time out correctly the burn-
back module may be faulty.
Replace.
2. If the other timers (start, weld,
crater) do NOT function correctly
the procedure board may be
faulty.
1. The procedure board may be
faulty. Replace.
1. If the option boards (start and
crater) are not installed make
sure the jumper plugs are
installed in the procedure board.
2. If the strike light is also lit (along
with the weld light) the logic
board may be faulty.
3. The procedure board may be
faulty. Replace.
1. Check the lead harness between
the burnback module and the pro-
cedure board for loose or faulty
connections.
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