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F-28
TROUBLESHOOTING & REPAIR
F-28
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 NA-5 repeatedly shutsdown
while welding.
1. Make sure the power source
polarity switch is set for the cor-
rect electrode polarity.
2. Make sure the #67 and #21 leads
are connected to the TS1 termi-
nal strip for the correct electrode
polarity. See wiring diagram.
3. Make certain the voltage control
switch on the Lincoln CV power
source is set in the “Remote”
position.
4. Make sure the #21 lead has con-
tinuity (zero ohms) to the work
piece.
5. Make sure the #67 lead has con-
tinuity (zero ohms) to the wire
feed head assembly.
6. Check the 1/8 amp fuse on the
NA-5 voltage board. Replace if
faulty.
7. The control cable may be faulty.
Check or replace.
8. Be sure the welding power
source is compatable with the
NA-5.
1. Perform the
Out of Voltage
Range Shutdown Test.
2. The voltage board may be faulty.
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