Lincoln Electric NA-5SF, NA-5NF service manual Troubleshooting & Repair

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F-18	TROUBLESHOOTING & REPAIR						F-18
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS				POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)				MISADJUSTMENTS(S)		COURSE OF ACTION
		MODE FUNCTION PROBLEMS
The burnback timer does not time			1.	Test if the other timers (start,	1.	Check the lead harness between
out properly.				weld, crater) function properly. If		the burnback module and the pro-
				they time out correctly the burn-		cedure board for loose or faulty
				back module may be faulty.		connections.
				Replace.
			2.	If the other timers (start, weld,
				crater) do NOT function correctly
				the procedure board may be
				faulty.
The weld light does not light. The			1.	The procedure board may be
weld controls (voltage and wire feed				faulty. Replace.
speed) may or may not function.
The NA-5 is at idle with the selector
switch in the “Weld” position.
The weld light is ON but the weld			1.	If the option boards (start and
controls (voltage and wire feed				crater) are not installed make
speed) do not function. The NA-5 is				sure the jumper plugs are
at idle with the selector switch in the				installed in the procedure board.
“Weld” postion.
			2.	If the strike light is also lit (along
				with the weld light) the logic
				board may be faulty.
			3.	The procedure board may be
				faulty. Replace.

CAUTION

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.

NA-5