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F-29
TROUBLESHOOTING & REPAIR
F-29
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
FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The circuit breaker trips when the
inch up, inch down, or start buttons
are pressed.
The circuit breaker trips and or the
fuse (F101) blows when the NA-5 is
turned on. (input power applied).
1. The power board may be faulty.
Replace.
1. Contact your Local Lincoln
Authorized Field Service Facility.
1. Perform the
Wire Drive Motor
Test.
2. Perform the
DC Power Supply
Test.
1. If fuse F101 or the circuit breaker-
immediately fails when input
power is applied, unplug all of
the PC boards except the power
board. If the fuse still fails the
power board may be faulty. If
the fuse does not fail reconnect
the PC boards one at a time until
the faulty board is located. Also
check and inspect the wiring har-
ness for “short” or “grounds”.
Reconnect the PC boards in the
following order: control,
voltage,logic,procedure,option-
timer, remote interface,speedme-
ter and voltmeter.
NOTE: Some of the above PC
boards are optional and may not
be used in all NA-5 control units.
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