Lincoln Electric NA-5N Service Manual page 85

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Observe all Safety Guidelines detailed throughout this manual
PROBLEMS
(SYMPTOMS)
The arc is unstable or oscillating.
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 & REPAIR
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
WELDING PROBLEMS
1. Check the welding cables for
loose or faulty connections.
2. Make sure the electrode and gas
(if used) is correct for the process
being used.
3. Put the output control switch (on
the power source) in the
"Machine Control" position.
Jumper the "BYPASS " pins on
the NA-5 voltage board. Control
the arc voltage from the power
source. If the problem is NOT
remedied the power source may
be at fault. If the problem is
solved the NA-5 may be at fault.
CAUTION
NA-5
RECOMMENDED
COURSE OF ACTION
1. The NA-5 voltage board may be
faulty. Replace.
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