Lincoln Electric SVM141-A service manual Display Board Schematic L10768

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G-6	ELECTRICAL DIAGRAMS	G-6
Display Board Schematic (L10768)

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	J20	1N4007
ELECT.	8
	C43	1N4007
	.0047
	3000V

D10	1N4007
D12	1N4007

D11
R98	47.5K	R22	47.5K

D13

C25

R23

47.5K R24

-Vsp

R26

R31

R25

15.0K

C26

1.00M

100K

R32

475K

D14

16

BANK4

a

7

750p

X8

1000V

2

R30

15

BANK3

b

6

47.5K

X7

3

5

1

100K

Vdd

c

3

13

BANK2

d

4

N_GND

9

2

R29

100K

R37

R2

BANK1

e

17

BANK5

h

19

44.2K

CW

10K

12

DATA IN

Vss

14

R128

VOLT

	3	8	VOLTS	3	8		3	8				NETSUPPLYVOLTAGE	POINTSOURCE SUPPLYPOWER			CONNECTIONGROUND EARTH
														CONNECTIONCOMMON
1			1			1		USED.NO LAST	R-128DZ-1	C-53X-12					CONNECTIONFRAME
2			2			2
4			4			4
5			5			5					D-18
6			6			6
7	DISP3		7	DISP2		7	DISP1
9			9			9
10			10			10

WORK

J20

5

J20

750p

1000V

N_GND

GAIN = .545

AMP

C32

47p

100V

		11	CLOCK	g	20
221K	C53
		10	/ENABLE	f	1
		18	DATA OUT	Rx	8
	100p		MC14489

	R33	GAIN = .042		6	100V					1.00K	R57
	1.00M				7
					X7
				5
	R121		R36	47.5K	R39	1.00K
	6.81K	GAIN = 4
	R42	12				HI_VOLT_FB
			14
	1.00K	X7
						C29	16	BANK4		a	7
	R43	13			2				X9
						0.1	15	BANK3		b	6
	1.00K
					X10	50V	3	Vdd		c	5
		R45	R46
10.0K	R44						13	BANK2		d	4
		15.0K	15.0K			L_GND
							9	BANK1		e	2

R47		LO_VOLT_FB	17	BANK5	h	19
			12	DATA IN	Vss	14
1.00K		3
	C33		11	CLOCK	g	20
	0.1	X10	10			1

												LABELS
1	3	8	AMPS	1	3	8	1	3	8		SPECIFIED)OTHERWISE UNLESS	SPECIFIED)OTHERWISE UNLESS	SPECIFIED)OTHERWISE
2				2			2
4				4			4
5				5			5
											MFD(.022/50V		400V1A,(UNLESS
6				6			6		INFORMATION	E1537PER SYMBOLS		(Ohms1/4W		1AB-FILENAME:l10768
7	DISP6			7	DISP5		7	DISP4
9				9			9
10				10			10

CUR_FB 3

+15V

R41

10.0K

C30

R1

5K CW

HI_CUR_FB	50V		/ENABLE	f
	L_5V	18	DATA OUT	Rx 8
	L_GND		MC14489

1.00K R58

GENERAL ELECTRICAL =CAPACITORS =RESISTORS =DIODES

R111 15.0K

D16

J20

AC 7

J20

OUTPUT_ENABLE

4

/LINESYNC J20

6 R124

N_GND

R49 4.75K

R112

C34

332K47p

	100V
	10.0K	R123
R55
10.0K
C37		6
0.1
50V	X10

N_GND

R56

10.0K

C38	7
0.1
50V	X10

N_GND

DZ1

R125

R76	4.75K
5

25

MODA

Vdd

48

X10

CLOCK

46

PD4

AS

26

LATCH

47

PD5

AD0

31

GAIN = 4

DATA

45

PD3

AD1

32

10

R50

HI_VOLT_FB

19

PE2

AD2

33

8

LO_CUR_FB

1.00K

R53

20

34

X7

LO_VOLT_FB

PE3

AD3

R51

9

1.00K

C35

4

HI_CUR_FB

17

PE0

AD4

35

1.00K

0.1

LO_CUR_FB

18

PE1

AD5

36

50V

X10

1

37

R52

R122

AC

PA7

AD6

L_GND

15.0K

15.0K

OUTPUT_ENABLE

7

PA1

AD7

38

LINESYNC

6

IC1/PA2

A8

16

42

PD0

A9

15

4.75K

43

PD1

A10

14

R75

4.75K

44

PD2

A11

13

R72

5

PA3

A12

12

R73

4.75K

4.75K

8

PA0

A13

11

R95

41

/IRQ

A14

10

40

/XIRQ

R/W

28

R87

4.75K

30

XTAL

E

27

R62

L_GND

29

EXTAL

A15

9

L_5V

4.75K

39

/RESET

PA4

4

L_5V

R63

21

VRL

PA5

3

4.75K

X5

L_GND

23

Vss

PA6

2

1

68HC11A1

R59

22

VRH

MODB

24

X12

L_5V

2

R127

4.75K

1.00M

Y1

1.00K

L_5V

4.75K

L_5V

R61

C39

8.0MHz

C40

R64

L_5V

22p

22p

130

R60

4.75K

C52

100V

100V

C51

C41

1.0

Vdd

0.1

35V

Q5

L_GND

50V

X6

RES

2N4401

S-8054HN

C42

3

4

X12

5

						11	LE		Vcc	20
						3	D0	X11	Q0	2						CODECOMMON A
						4	D1		Q1	5					MAYDIAGRAM
						7	D2		Q2	6
						8	D3		Q3	9
						13	D4		Q4	12
L_5V						14	D5		Q5	15				CHANGEMAY BOARDCIRCUIT PRINTEDA ONCIRCUITRY ORCOMPONENTS SINCE. A.N	THISBOARD, COMPLETEA OFINTERCHANGEABILITY THEAFFECTING WITHOUT	HAVINGCONTROLS OFCIRCUITRY ORCOMPONENTS EXACTTHE SHOWNOT
1	Vpp		Vcc	28		17	D6		Q6	16
11	D0		A0	10		18	D7		Q7	19
12	D1		A1	9		10	GND	74HC373	OE	1
13	D2	X1	A2	8					L_GND
15	D3		A3	7
16	D4		A4	6
17	D5		A5	5
18	D6		A6	4									+15V
19				3
	D7		A7
25	A8		/CE	20
24	A9		/0E	22								4	C20
21	A10		A14	27
													0.1
23	A11		A13	26						+15V		X7	50V
14	GND	27C256	A12	2
							+15V
												33074A
													C21				.NUMBER
				3	X4	4						11	0.1
													50V
								D15		R118	475
	6							1N4936					:NOTES
				5	X4	6
			D18
													-Vsp	+15V
			1N4936
				9	X4	8		R116			Q2
	R21		R115								2N4401
								4.75K					14

4.75K

5.1V

4.75K

L_GND

Vss

22.1K	22.1K
	X4	C19

C46

J20

CONTROL BD 15V

1

J20

CONTROL BD GND

2

1W

C47

N_GND

+15V

C2	C1
	4.7
	35V

N_GND

N_GND

	R126	10.0K	R4	R8						+15V
			47.5	47.5			L_GND	V_5V		C13
			R5	R9
										0.1
			L_GND
			47.5	47.5		D3				50V
			R6	R10
			47.5	47.5	IN	X2	OUT
			R7	R11				D5
			47.5	47.5	C6		C9		C10
						GND
			D2	C5					1.0	D7
R38	10.0K								35V	R20	100K
				1.0
				35V
			R12	R16						L_5V
			47.5	47.5
			R13	R17					A_5V
			47.5	47.5
			R14	R18		D4
			47.5	47.5
			R15	R19		X3
			47.5	47.5	IN		OUT
				C7	C8
				1.0		GND	C11	D6		C12
				35V						1.0
										35V

Q1

2N4401

9

X12

10

12

X12

13

119 KHz OSC.

11

X4

10

C45

0.1

47.5K

R117

1

X4

2

100p

50V

100V

13

X4

12

7

+15V

L_5V

C14

820p

R119

26.7

48

28

20

14

50V

C17

C18

C48

C49

X12

C50

X5

X1

X11

0.1

-Vsp

1.0

0.1

0.1

74HC132

50V

35V

50V

50V

C15

68HC11A1

27C256

74HC373

Q3

1.0

2N4401

35V

23

14

10

7

D9

L_5V

V_5V

A_5V

1N4936

C16

L_GND

2N4403

D8

1.0

Q4

8

Vdd

3

Vdd

3

8

1N4936

35V

X10

C22

X8

C23

X9

C24

R120

26.7

0.1

0.1

0.1

11

TCF6000

50V

MC14489

50V

MC14489

50V

1

Vss

14

Vss

14

Return

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L_GND	L_GND	ISOLATED CIRCUIT	L_GND
NOTE: Lincoln Electric assumes no responsibility for liablilities resulting from board level troubleshooting. PC Board repairs will invalidate your factory warranty. Individual Printed Circuit Board Components are not				L10768
				7-24-98
available from Lincoln Electric. This information is provided for reference only. Lincoln Electric discourages board level troubleshooting and repair since it may compromise the quality of the design and may result
in danger to the Machine Operator or Technician. Improper PC board repairs could result in damage to the machine.			SQUARE WAVE TIG 275