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F-31
TROUBLESHOOTING & REPAIR
F-31
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
STARTING/WELDING PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
The arc voltage appears to rise too
slowly. The wire stubs or blasts off
at the start of the weld sequence.
Once the arc is established the weld-
ing is OK.
The voltage seems too high or flares
excessively at the start of the weld
sequence. Once the arc is estab-
lished the welding is OK.
1. Increase the strike and or start
voltage settings.
2. 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.
3. If the start response jumper, on
the voltage board, is in the “B”
position, change to the “A” posi-
tion. If the “A” position cures the
starting problem the voltage
board may be faulty.
1. Decrease the strike and or start
voltage settings.
2. Put the output control switch (on
the power source) in the
“Machine Control” position.
Jumper the “BYPASS” pins on
the 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.
1. The voltage board may be faulty.
Replace.
1. The voltage board may be faulty.
Replace.
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