Lincoln Electric DC-655 service manual Section, Simplified Trigger Diagram. If a resistance

F-15 F-15

TROUBLESHOOTING & REPAIR

TOC	TOC				FIGURE F.2 – TERMINAL STRIP AND 14-PIN RECEPTACLE
to Section	to Master
Return	Return									K=42
									A=32	J=31
						14 PIN MS RECEPTACLE
									B=GND	I=41
									L	N
									C=2	H=21
									D=4	G=75
TOC	TOC								E=77	F=76
Section	Master
		POSITIVE						LOW INDUCTANCE	HIGH INDUCTANCE	M
		OUTPUT
								NEGATIVE OUTPUT
									NEGATIVE OUTPUT
		TERMINAL
								TERMINAL
					TERMINAL STRIP				TERMINAL
Return to	Return to				COVER PANEL
	+21	-21 41	4	2	31 32	75	76	77

			TERMINAL STRIP
TOC	TOC
Section	Master	4.	Check for the presence of 42 VAC at the ter-	8.	Check continuity (zero ohms) from pin “D”
to	to		minal strip ( #2 to #41). See the Simplified		(lead #4) at the 14-pin receptacle to the out-
			Trigger Diagram.		put terminal switch and also to plug J5-pin
Return	Return
			check the circuit breaker and leads #42A		9 at the firing board. See the Simplified
		5. If 42 VAC is not present at the terminal strip,			Trigger Diagram and Figures F.1 and F.2. If
			and #41 at the P15 connector. See the		a resistance of any value is indicated, check
					the associated wires and plugs.
			Simplified Trigger Diagram. Also perform
			the Main Transformer Test.
		6. Remove the main input supply power to the
			DC-655 machine.
		7. Check continuity (zero ohms) from lead
TOC	TOC		#42A ( plug P15 pin-13) to lead #2 at the 14-
			pin receptacle pin “C”. Also check continu-
Section	Master		ity to the output terminal switch. See the
			Simplified Trigger Diagram. If a resistance
			of any value is indicated, check the associ-
Return to	Return to		ated wires and plugs.
			IDEALARC DC-655