Lincoln Electric NA-5N Service Manual page 76

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The travel will not function with the
travel switch in the "Auto" postion.
The travel operates correctly with the
travel switch in the "Hand" position.
The travel runs continuously when
the travel switch is in the "Auto" posi-
tion.
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)
TRAVEL FUNCTION PROBLEMS
1. Make sure the jumper leads #691
and #692 are connected properly
to the correct pins on the logic
board. See wiring diagram.
2. Check the travel switch (S2) and
associated leads for loose or
faulty connections. See wiring
diagram.
3. Check light 7H located on the
logic board. This light should be
ON when the "Auto" travel is
active. If light 7H does not light
the logic board may be faulty.
1. Make sure the jumper leads #691
and #692 are connected properly
to the correct pins on the logic
board. See wiring diagram.
2. Check light 7H on the logic board.
If light 7H is always ON the logic
board may be faulty.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
1. If light 7H, located on the logic
board, does light when the auto-
matic travel is active check the
CR2 relay. Normal coil resis-
tance is 10,000 ohms. The con-
tacts (terminals 2 and 4) should
"close" when 110VDC is applied
to the relay coil (terminals 1 +
and 3 -).
1. The 2CR relay may be faulty.
The contacts (terminals 2 and 4)
may be stuck closed.
2. Check the associated leads for
misconnections. See wiring dia-
gram.
F-23