Lincoln Electric NA-5N Service Manual page 69

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
When welding the start timer does
not time out. The unit stays in the
start mode.
The crater light does not light. The
crater controls (voltage and wire
feed speed) may or may not func-
tion. The NA-5 is at idle with the
selector switch in the "Crater" pos-
tion.
The crater light is ON but the crater
controls (voltage and wire feed
speed) do not function. The NA-5 is
at idle with the selector switch in the
"Crater" position.
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. When the weld is stopped check
to see if the crater (if used) or
burnback timer is functioning
properly. If the crater and or burn-
back timer IS functioning properly
the start timer may be faulty.
2. If the start, crater and burnback
timers are not working properly
the procedure board may be
faulty.
1. Make sure the crater option
boards are installed correctly.
2. The procedure board may be
faulty. Replace.
1. If no other lights are lit the crater
option board may be faulty.
Replace.
2. If the strike light is also lit (along
with the crater light) the logic
board may be faulty.
3. If the weld and or start lights are
also lit (along with the crater light)
the procedure 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.
1. Check the lead harness between
the crater option boards and the
procedure board for loose or
faulty connections. See wiring
diagram.
1. Check the lead harness between
the crater option boards and the
procedure board for loose or faulty
connections. See wiring diagram.
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