Lincoln Electric SVM188-A service manual Internal Trigger Circuit Test, Procedure

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

F-14	TROUBLESHOOTING AND REPAIR				F-14
	INTERNAL TRIGGER CIRCUIT TEST (continued)
		FIGURE F.3 – FIRING BOARD
				(205) 8	J5
		LED8	LED9 LED7		16 (204)
				(206) 7	15 (203)
				(207) 6	14
				(208) 5	13 (231)
				4	12 (215)
				3	11
				2	10
				1
					9
	LED5	LED3	LED1		J6

LED10

J7

LED6 LED4 LED2

J8

J4

G3742-[ ] FIRING BOARD

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

PROCEDURE

WARNING

ELECTRIC SHOCK can kill.

• Have an electrician install and service this equipment. Turn the input power OFF at the fuse box before working on equipment. Do not touch electrically hot par ts.

1.With the correct input power applied to the DC-600 and the trigger circuit not activated, LEDs 7, 8 &9 on the firing board should be lit. When the trigger is activated, all of the LEDs should come ON. See

Figure F.1.

2.If LED 10 and LEDS 1 thru 6 light when the trigger circuit is activated, the wiring and circuitry to the fir- ing board is good. If there is no output at the studs, perform the Firing Board Test and see the PC

Board Troubleshooting Guide.

3.If LED 10 does not light when the trigger circuit is activated check the 10 amp Circuit Breaker. See

Figure F.2.

4.With a Voltmeter, check for 42vac at TS-2, termi- nals 2 & 42. See Figure F.2. If not present, check wiring per the Simlpified Trigger Diagram (Figure F.5). If OK, perform the Main Transformer Test.

5.Remove the main input supply power to the DC- 600.

6.Check for continuity (zero ohms) from lead #42A to lead #2 at the 14-pin receptacle pin “C”. Also check continuity to the Output Terminal Switch. See the Simplified Trigger Diagram. If a resistance of any value is indicated, check the associated wires and plugs.

7.Check for continuity (zero ohms) from pin “D” (lead #4) at the 14-pin receptacle to the output terminal switch and also to plug J5-pin 9 at the firing board. See the Simplified Trigger Diagram and Figures F.1 and F.2. If a resistance of any value is indicat- ed, check the associated wires and plugs.

8.Check for continuity (zero ohms) from lead #41 (14 Pin Connector Pin I) to plug J5-pin 1 at the firing board. See the Simplified Trigger Diagram and

Figure F.1.

DC-600