Lincoln Electric SVM146-A service manual LOW Voltage Circuit Test, T2 Auxiliary Transformer

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F-36 F-36

TROUBLESHOOTING & REPAIR

LOW VOLTAGE CIRCUIT TEST (continued)

FIGURE F.12 - LOW VOLTAGE CIRCUIT DIAGRAM

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	T2 AUXILIARY
	TRANSFORMER
TO H1	H1
"C" TERMINAL			BROWN
INPUT
RECTIFIER		12VAC BROWN
	H2
			RED
		24VAC	RED
	H3
TO
RECONNECT
LEAD "A"
	H4		BLUE
		18VAC	WHITE
	H5	18VAC	BLUE
PROCEDURE

8

3

2

6

4

5

9

J21

#53	3J30
#56		17 VDC
	6J30			PLASMA
				OUTPUT
#51	1J30			BOARD
#54			32 VDC
	4J30
#61								D
	1J1				#216
				6J2			15J40	I	B
	=+15VDC
#62						+		S	O
	2J1		CONTROL BOARD			+15VDC
#64	=-15VDC			9J2	#219		10J40	P	A
	4J1							L	R
								A	D
								Y

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1.Remove input power to the PRO-CUT 80 machine.

2.Using the 5/16" nutdriver remove the case wraparound cover.

WARNING

ELECTRIC SHOCK can kill.

• Do not touch electrically hot parts.

3.Apply the correct input power to the machine and carefully check for the following voltages.

4.Check for the presence of approximately 32 VDC on the output board.

a.LED1 should be lit when 32 VDC is present. See Figure F.13. See Output Board LED Definitions and Figure F.12, Low Voltage

Circuit Diagram.

b.To verify the presence of 32 VDC, check across capacitor C13. Make certain the voltmeter probes make good contact with the capacitor leads. See Figure F.13.

5.Check for the presence of 17 VDC on the out- put board.

a.LED2 should be lit when 17 VDC is present. See Figure F.13. See Output Board LED Definitions and Figure F.12, Low Voltage

Circuit Diagram.

b.To verify the presence of 17 VDC, check from plug J31 Pin-6 to diode D25 (anode). See Figure F.13. Make certain the volt- meter probes make good contact with pin- 6 and the diode anode lead. It will be nec- essary to penetrate the silicon sealant.

6.Check for the presence of +15 VDC on the control board.

a.LED1 should be lit when +15 VDC is pre- sent. See Figure F.13. See Control Board LED Definitions and Figure F.12,

Low Voltage Circuit Diagram.

7.Check for the presence of -15 VDC on the con- trol board.

a.LED3 should be lit when -15 VDC is pre- sent. See Figure F.13. See Control Board LED Definitions and Figure F.12, Low

Voltage Circuit Diagram.

PRO-CUT 80