Lincoln Electric NA-3S, Service Manual, Page: 74 / 110

The wire will not inch up but inches
down properly.
1. With the NA-3/NA-4 at idle (not
feeding wire), observe light 1D
on the control board. The light
should be lit. If light 1D is NOT
lit, the control board may be
faulty.
2. While pressing the “Inch Up”
switch, observe light 1A on the
control board. If light 1A does
NOT light, check the “Inch Up”
switch and associated leads
#593 and #539. See wiring
diagram. If light 1A is lit, the
control board may be faulty.
1. Perform the
Wire Feed Drive
Motor Test.
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-9 F-9
NA-3 AND NA-4
FUNCTION PROBLEMS (Continued)
PROBLEMS
(SYMPTOMS) POSSIBLE AREAS OF
MISADJUSTMENT(S) RECOMMENDED
COURSE OF ACTION
The wire feeds up with either inch
switch. 1. While pressing the “Inch
Down” switch, observe light 2E
on the logic board. If light 2E
does NOT light, the logic board
may be faulty.
If light 2E does light, the control
board may be faulty.
1. Check the wiring to the “Inch
Down” switch. See wiring dia-
gram.
2. Check the wiring between the
logic board and the control
board. See wiring diagram.
The wire feeds down with either
inch switch. 1. With the NA-3/NA-4 at idle
(not feeding wire), observe
light 2E on the logic board. It
should be “Off”. If light 2E is
“On”, the logic board may be
faulty.
If light 2E is “Off”, the control
board may be faulty.
1. Check the wiring to the
“Inch Up” switch. See wiring
diagram.
2. Check the wiring between the
logic board and the control
board. See wiring diagram.
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