Troubleshooting Guide - Lincoln Electric NA-3 Service Manual

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Troubleshooting Guide –
of specified components and when troubleshooting specific circuits.
PROBLEMS
(SYMPTOMS)
The wire does not feed. No inch
up or down. Wire does NOT
feed when "Start" switch is
activated.
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 AND REPAIR
See the Wiring Diagrams Section for location
POSSIBLE AREAS OF
MISADJUSTMENT(S)
FUNCTION PROBLEMS (Continued)
1. Make sure the "Control
Power" switch (S1) is on and
functioning properly.
2. Check the circuit breaker
located on the front cover. If
tripped, reset. If circuit
breaker repeatedly trips, con-
sult appropriate PROBLEMS
(SYMPTOMS.)
3. Check field fuse F1 (1/2 Amp)
on the control board.
4. Open the front cover and inner
panel to check if any of the
LEDS on the printed circuit
boards are lit. If no LEDS are
lit, this is an indication that the
NA-3/NA-4 is NOT receiving
any power. Check fuse F2
(2/10 Amp but may be a 3/10
Amp fuse) on the control
board. Also make sure 115
VAC is being received on
leads #531 and #532. See
wiring diagram. If fuse F2
repeatedly fails, control board
may be faulty.
CAUTION
NA-3 AND NA-4
Observe Safety Guidelines
detailed at the beginning of this manual.
RECOMMENDED
COURSE OF ACTION
1. Check lights 1C and 1D on
the control board. If both
lights are lit at the same time,
replace the control board.
2. Press the "Inch Up" switch.
Lights 1D and 1E on the con-
trol board should be lit. If they
are NOT lit, the control board
may be faulty.
3. If light 1D and 1E are lit and
the wire drive motor does not
turn, check the continuity of
leads #539, #541, #626, and
#627 from the control board to
the wire drive motor.
4. Perform the Wire Feed Drive
Motor Test.
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