Troubleshooting & repair, Caution – Lincoln Electric NA-5S User Manual
Page 63
F-10
TROUBLESHOOTING & REPAIR
F-10
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
NA-5 units above code 8300 with
“cold starting”.
While pressing the inch down button
the wire does not stop when it touch-
es the work.
The wire will NOT inch up but does
inch down and weld properly.
The wire feeds UP when either inch
button is pressed.
1. Check the 1/8 amp fuse on the
voltage board. Replace if faulty.
2. While pressing the inch down but-
ton with the wire touching the
work piece, observe light 7G on
the logic board. If the light goes
on but the wire does NOT stop
feeding the logic board may be
faulty.
1. With the unit at idle (no buttons
pressed) observe lights 1D, on
the power board, and light 7E, on
the logic board. 1D should be
ON. 7E should be OFF.
2. If 1D is OFF replace the power
board.
3. If 7E is ON replace the logic
board.
1. While pressing the inch down but-
ton observe light 7E on the logic
board. It should be ON.
2. If light 7E is ON, while the inch
down button is pressed, the
power board may be faulty.
Replace.
3. If light 7E remains OFF, while
the inch down button is pressed,
the logic board may be faulty.
Replace.
2. Check the continuity of leads
#667 and #621 to the voltage
board. See wiring diagram.
3. The logic board may be faulty.
4. The voltage board may be faulty.
1. Check the inch up switch (button)
for proper operation. Also check
associated leads for loose or
faulty connections. See wiring
diagram.
1. Check the inch up and inch down
switches (buttons) for proper oper-
ation and wiring. See wiring dia-
gram.