Lincoln Electric SVM175-A service manual Mode Switch, Table F.3

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F-77		TROUBLESHOOTING & REPAIR				F-77
	CONTROL POTENTIOMETER AND MODE SWITCH RESISTANCE TEST
				(continued)
				TABLE F.3
		POT/MODE SWITCH RESISTANCE TEST
		MODE SWITCH		OHMMETER	OHMMETER
		SETTING		CONNECTION	READING
		CC-STICK	P7-9 (#214) TO P7-14 (#218)		500K or Higher
		CC-STICK	P7-9 (#214) TO P7-15 (#220)		500K or Higher
		CC-STICK	P7-9 (#214) TO P7-16 (#222)		500K or Higher
		CC-STICK	P7-14	(#218) TO P7-15 (#220)	500K or Higher
		CC-STICK	P7-14	(#218) TO P7-16 (#222)	500K or Higher
		CC-STICK	P7-15	(#220) TO P7-16 (#222)	500K or Higher
		TOUCH START TIG	P7-15	(#220) TO P7-16 (#222)	*
		DOWNHILL PIPE	P7-14	(#218) TO P7-16 (#222)	*
		CV-WIRE	P7-9 (#214) TO P7-16 (#222)		*
		N/A	P7-5 (#75) TO P7-1 (#77)		about 10K
					Ohms values should
					sweep smoothly from 10K
		N/A	P7-1 (#77) TO P7-4 (#76)		to 0 when ARC CONTROLis
					turned from Min. to Max.
		N/A	P7-6	(#279) TO P7-8 (#277)	about 10K
					Ohms values should
					sweep smoothly from 10K
		N/A	P7-8	(#277) TO P7-7 (#278)	to 0 when ARC CONTROLis
					turned from Min. to Max.
		* Resistance should be very low, The Ohmmeter should read			about the same value as
		one would get by touching the two meter probes together.

If the resistance readings are not as specified in the table, replace the potentiome- ter and mode switch plug and lead assembly, or replace the defective component. See the Wiring Diagram.

if testing is complete, plug P7 back into the control PC board and perform the

Case Cover Replacement Procedure.

RANGER 305D