Lincoln Electric NA-3S, Service Manual, Page: 81 / 110

TROUBLESHOOTING AND REPAIR
Observe Safety Guidelines
detailed at the beginning of this manual.
Troubleshooting Guide –
See the Wiring Diagrams Section for location
of specified components and when troubleshooting specific circuits.
F-16 F-16
NA-3 AND NA-4
TRAVEL FUNCTION PROBLEMS (Continued)
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
The travel circuit will not operate
with the “Travel” switch in the
“Automatic Travel” position. Works
properly in the “Hand Travel” posi-
tion. 1. Check to make sure the jumper
leads on the logic board are
connected properly for the
automatic travel desired. See
wiring diagram.
1. Check light 2H on the logic
board when the automatic trav-
el should be active. The light
should be lit.
2. If light 2H is NOT lit, check the
coil resistance of relay 2CR.
Normal coil resistance is
10,000 ohms. If the coil resis-
tance is not correct, relay 2CR
may be faulty.
3. If light 2H is NOT lit and the
coil resistance of relay 2CR is
normal, check wires #589 and
#510 between the relay and
the logic board. If the wiring is
good, the logic board may be
faulty.
4. If light 2H on the logic board IS
lit, remove the input power
and also remove leads #532
and #625 from the contacts on
relay 2CR. Apply power and,
with light 2H lit, check the
resistance of relay 2CR con-
tacts. The resistance should
be zero or very low. If the
contact resistance is high, the
relay is faulty. Replace.
5. The “Travel” switch or associ-
ated wiring may be faulty.
Check and replace if
necessary.
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