Lincoln Electric SVM172-A service manual Troubleshooting & Repair

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F-7	TROUBLESHOOTING & REPAIR			F-7
POWER FEED 10M
	Observe Safety Guidelines detailed in the beginning of this manual.
PROBLEMS		POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)		MISADJUSTMENT(S)	COURSE OF ACTION
	FUNCTION PROBLEMS (Continued)
The displays are blank (not lit).		1. Check for loose or faulty connec-	1. Check for 5VDC at J37 pins 2
The wire feeds when the gun trig-		tions at plug on the display	and 10 on the display board. If 5
ger is activated.		board, to plug on the feedhead	VDC is present, then the display
		control board.	board may be faulty.
			2. If the 5VDC is low or not present,
			check for loose or faulty connec-
			tions in SPI circuit. See machine
			schematic.
			3. The feedhead control board ma
			be faulty.
The dual procedure is not function-		1. Make certain the LED indicator	1. Check sheilded cable lead and
al when using the remote Dual		on the Dual Procedure Panel is	connections from J86 on PC BD
Procedure switch.	The STATUS	in the middle position. This	to MSP panel. Check SPI cable
LEDs are steady green on the		enables the gun remote dual pro-	from MSP panel to Dual/memory
power source, Control Box and wire		cedure switch.	panel. Per machine schematic.
drive units.
			2. Check for 5VDC at J86 pins 2
			and 10. Check for 15VDC at J86
			pins 1 and 10. If voltage is not
			present replace feed head or
			user interface BD depending on
			model. If leads and voltages are
			good replace	dual/memory
			panel.

CAUTION

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

POWER FEED 10M SINGLE/DUAL