Lincoln Electric NA-5NF, NA-5SF service manual Problems Possible Areas, Section, Accuracy Test

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F-24	TROUBLESHOOTING & REPAIR					F-24
Observe all Safety Guidelines detailed throughout this manual
PROBLEMS			POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)			MISADJUSTMENTS(S)		COURSE OF ACTION
			FUNCTION PROBLEMS
After pressing the stop button, the		1.	Carefully disconnect the #2 lead	1.	The 3CR relay may be faulty.
electrode “Hot” light goes OFF, but			from the power source terminal		The contacts (terminals 2 and 4)
the electrode wire remains electrical-			strip. The welding voltage should		may be stuck closed.
ly hot. (The welding voltage is			be disabled. If the welding volt-
always present). The wire stops			age is still present the power	2.	Check the associated leads for
feeding.			source is faulty.		misconnections. See wiring dia-
					gram.
		2. Check or replace the control
			cable between the power source
			and the NA-5 unit.
After pressing the stop button, the		1.	If a crater option module is used,	1.	If, while pressing the stop button,
weld light remains on and the wire			check to make sure the logic		light 7C does NOT go on,	check
continues to feed.			board jumper (#694) is on pin		the stop button and associated
			P10.		leads.
		2. While pressing the stop button
			observe light 7C located on the
			logic board. It should be lit. If
			light 7C is ON and the wire feed-
			ing and welding does not stop,
			the logic board may be faulty.
The set and actual speed meter		1.	Made sure the calibration jumper	1.	Remove the drive motor end cap
readings match within a few IPM, but			on the speedmeter board is con-		and the tach cover plate from the
both are in error.			nected properly. See Operation		end of the wire drive motor.
			Section.		Check to make sure the slotted
					disc is secure and aligned and
					rotates freely through the center
					of the module pick-up.
				2. Perform the Wire Speed
					Accuracy Test
				3. Perform the Meter Circuit
					Accuracy Test.
				4. The control 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