Lincoln Electric SVM 117-A Right side heat sink See Figure F.14, Disconnection Heat Sink Lead

		F-32	TROUBLESHOOTING & REPAIR		F-32
TOC	TOC	SCR OUTPUT RECTIFIER REMOVAL & REPLACEMENT (CONTINUED)
Section	Master	PROCEDURE		4. Cut the SCR gate leads G1 and G2
				(see wire markers and wiring dia-
to	to	1.	Disconnect lead #208 and	gram) using wire cutters.
Return	Return		Transformer Lead X1 from the heat	leads is from the right side of the
			(facing the front) using a 1/2" socket
			sink on the left side of the machine	a. The easiest access to these
			wrench. See Figure F.12.	machine.
			a. Thin lead is always on the out-	b. Cut any necessary cable ties.
			board side of the connection.

			5. Remove the four screws holding the
			SCR Assembly to the floor of the
			machine using a 5/16" nut driver.
TOC	TOC		6. Pivot the SCR Assembly counter-
			clockwise to provide access to the
SectiontoReturn	MastertoReturn		right side heat sink.
			See Figure F.14.
		FIGURE F.12 - Heat Sink lead discon-
		nection.
		2. Disconnect lead #204 and heavy
TOC		lead from the middle heat sink with a
	TOC	1/2" socket wrench and 1/2" open
		end wrench. See Figure F.13.
Section	Master	negative capacitor band buss bar on	Disconnection		-	Heat	Sink	Lead
		3. Remove the diode lead from the	FIGURE	F.14
to	to	the right side of the machine using a	7. Remove lead #209 and Transformer
Return	Return	slot head screwdriver and 3/8" open
			Lead X4 from the right side heat sink
		end wrench.
			using a 1/2" socket wrench and 1/2"
			open end wrench.
			8. Clear the leads and carefully
			remove the SCR Rectifier Assembly.
			NOTE: When installing the SCR
			Rectifier Assembly, apply a thin coating
TOCSectionto	TOCMasterto		of Dow Corning #340 Compound to the
			electrical connections.
Return	Return	FIGURE F.13 - Heat Sink lead discon-
		nection.
		WIRE-MATIC 250