Lincoln Electric SVM114-C service manual Feeding Problems

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F-4	TROUBLESHOOTING AND REPAIR		F-4
Troubleshooting Guide – See Wiring Diagrams for location of specified		Observe Safety Guidelines
components. See Wiring Diagrams for troubleshooting of specific circuits.		detailed in the beginning of this manual.
PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION

FEEDING PROBLEMS

NOTE: Many options and possible option combinations are available for the LN-25™. In many cases, it is best to disconnect the options and test the LN-25™ in its “basic” form. In this manner, many possible faulty circuits can be isolated and/or eliminated from the troubleshooting procedure.

Major physical or electrical damage	1. Contact	Lincoln	Electric
is evident when the box cover is	Service Department 1-888-
removed.	935-3877.
When gun trigger is pulled, there is	1. Check to see if the drive rolls			1. With the gun trigger circuit
no wire feed.	are turning when the gun			activated and the mode switch
NOTE:On codes above 10100, the	trigger is pulled. If the drive			in the CV position, check for
	rolls are turning, then check for			the presence of 2 to 23 VDC at
motor leads (541 & 539) are	a mechanical restriction in the			leads 539 to 541. This is the
in Control Board Connector	wire feed path.			nor mal range for ar mature
J4, pins 13 & 14.	2. If the drive rolls do not turn,			voltage, which is dependent on
				the wire speed setting.
	then check to ensure the power
	source is on and an open			2. If the normal armature voltage
	circuit voltage (OCV) is present			is present at leads 539 to 541,
	at the weld terminals.			then the motor or motor
	3. Make sure the LN-25™ work			brushes may be faulty. Check
				or replace.
	clip is connected to the work
	piece or work terminal.			3. If the correct armature voltage
	4. Ensure the LN-25™ polarity			is missing, then remove any
				option plugs that may be
	switch matches the electrode
				connected to J3 on the control
	polarity.
				board. Install the jumper plug
	5. Check if the jumper plug on the			into the J3 receptacle. If the
				problem is solved, then the
	control board or		contactor
				option board may be faulty.
	board (if used) is loose or
	missing.			4. Check the wire speed control,
	6. Make certain the power source			range switch and associated
				wiring to the control board.
	open circuit voltage is above 15
	VDC but not more than 110			5. If the correct armature voltage
	VDC.
				is still not present at leads 539
	7. Check if	the gun	trigger is	to 541, then the control board
				may be faulty. Replace.
	faulty. Repair or replace.

8.On “older” control boards, check the 1/8 amp fuse. If “blown”, the gun may be faulty.

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 1-888-935-3877.

LN-25™