Lincoln Electric SVM175-A service manual Potentiometer Mode Switch Test

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F-10									F-10
TROUBLESHOOTING & REPAIR
TROUBLESHOOTING GUIDE				Observe Safety Guidelines
	detailed in the beginning of this manual.
PROBLEMS	POSSIBLE AREAS OF		RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)		COURSE OF ACTION
	WELD OUTPUT PROBLEMS
The machine front panel output	1. The condition is normal in		1.. Check plug #P1 on the control
control is still active when the	“Touch Start TIG” mode.	See		PC board.		Plug		should be
remote control unit is connected to	the operators’ manual.			properly seated and pins in
one of the Amphenol Receptacles.	2. The remote control unit may be			both the plug and the PC board
				jack must be clean and fit tight-
	defective.
				ly together.
	3. Check the Amphenol recepta-		2. There may be a poor connection
	cles. Look for damaged or cor-
				between	the	weld		control PC
	roded contact pins in the recep-
				board and the Amphenol recep-
	tacle and in the plug of	the
				tacles.	Check		for	continuity
	remote control unit.
				between the following terminals.
				See Wring diagram and control
				connection diagram.
			P1-10 to 6 pin Amphenol pin “C”
			and to 14 pin Amphenol pin “G”.
			P1-11 to 6 pin Amphenol pin “A”
			and to 14 pin Amphenol pin “E”.
			P1-14 to 6 pin Amphenol “B” and to
			14 pin Amphenol pin “F”.
			3. The weld control Pc board may
				be defective.
The machine seems to be locked	1. Check the position of the WELD		1.	Check that plug P-7 is fully seat-
into the “CC-STICK” mode of oper-	MODE selector switch.	The		ed into the weld control PC
ation.	switch should cleanly snap into			board socket.			See		Control
	each mode position, and should			Inner-Connection					diagram.
	not feel gritty or get hung-up			Check for corroded, dirty, or
	between positions.			damaged Molex			terminals in
				plug P-7, also check for similar
				problems in socket J-7 on the
				weld control PC board. Check
				the wiring between the control
				PC board and the mode switch.
				look for poor crimp and solder
				connections as well as dam-
				aged wiring or insulation. See
				wiring diagram.
			2.	Perform		the			Control
				Potentiometer			and		Mode
				Switch Test.
			3. The Weld control PC board may
				be defective.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.

RANGER 305D