Symptoms, Troubleshooting & repair, Caution – Lincoln Electric NA-5S User Manual
Page 57
F-4
TROUBLESHOOTING & REPAIR
F-4
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
WIRE FEEDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The wire feeds whenever the input
power switch is in the “ON” position.
1. Check the “Start” switch (S5).
Make sure it is not stuck closed.
2. Check the “Inch Down” switch
(S4). Make sure it is not stuck
closed.
3. Check the “Inch Up” switch (S3)
Make sure it is not stuck closed.
4. Check to make sure that jumper
lead #693 is connected to the
proper pin on the logic board.
See wiring diagram.
1. Check light 7B on the logic board.
It should NOT be on. If light 7B is
ON remove lead #518A from the
“Start” switch. If the light remains
ON the logic board may be faulty.
If the light goes OFF check the
switch and associated leads.
See wiring diagram and Figure
F.1.
2. Check light 7J on the logic board.
It should NOT be on. If light 7J is
ON remove lead #592 from the
“Inch Down” switch. If the light
remains ON the logic board may
be faulty. If the light goes OFF
check the switch and associated
leads. See wiring diagram and
Figure F.1.
3. |Disconnect lead #586 from the
“Inch Up” switch. If the problem
is resolved check the switch and
associated leads. See wiring dia-
gram.
4. Check lights 7B, 7J and 7E.
They should all be OFF. If lights
7B and 7J are OFF and light 7E
is ON the logic board may be
faulty. See Figure F.1.
5. Disconnect plug “A” from the logic
board. If the wire feed stops the
logic board may be faulty. See
Figure F.1.
6. If the feed does not stop with plug
“A” disconnected, disconnect plug
“E” from the logic board. If the
wire feed stops with plug “E” dis-
connected the logic board may be
faulty. If the wire feed does NOT
stop with plug “E” disconnected
the power board may be faulty.
Replace. See Figure F.1.