Troubleshooting & repair, Caution – Lincoln Electric NA-5S User Manual
Page 72
F-19
TROUBLESHOOTING & REPAIR
F-19
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
MODE FUNCTION PROBLEMS
PROBLEMS
(SYMPTOMS)
POSSIBLE AREAS OF
MISADJUSTMENTS(S)
RECOMMENDED
COURSE OF ACTION
During the welding sequence the
weld light does not go ON.
While welding the weld mode is
omitted in the welding sequence.
The weld timer is set for a longer
time than zero seconds.
The weld timer does not time out.
the unit stays in the weld mode.
1. If the optional start timer is
installed determine if the start
mode is timing out. If the
sequence stays in the “start”
mode the start timer may be
faulty.
2. If the start module is OK and the
weld light does not go ON the
logic board may be faulty.
Replace.
3. If a start module is NOT used
make sure the jumper plug is
installled in the procedure board
receptacle.
1. The weld timer module may be
faulty. Replace.
1. Set the burnback timer for a value
greater than zero seconds. Start
the weld sequence and then stop
it with the stop button. Check to
see if the unit returns to the nor-
mal idle state.(Strike light ON and
“Hot Electrode” light OFF).
• If the weld mode ends and
the unit returns to the nor-
mal idle state, the weld
timer module may be
faulty.
• If the unit does NOT return
to the normal idle state the
procedure board may be
faulty.
1. Check the lead harness between
the weld timer and the procedure
board for loose or faulty connec-
tions.
1. Check the lead harness between
the weld timer and the procedure
board for loose or faulty connec-
tions.