Lincoln Electric SVM118-A service manual Meter PC Board M15893 Schematic

SQUARE WAVE TIG 355

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G-4 ELECTRICAL DIAGRAMS G-4

Meter PC Board (M15893) Schematic

15892

M

+5V

Q1

D1

300mA

3

8

3

8

3

8

30V

3.32K

1

1

1

R2

2

2

2

4

4

4

5

5

5

6

6

6

5

X5

6

C1

475

7

LED1

7

LED2

7

LED3

9

9

9

R1

10

10

10

9

8

D2

X5

1N914

R3

R4

R5

R6

R7

R8

R9

R10

R11

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21

R22

R23

R24

3

A

+5V

3

A

+5V

3

A

X3

+5V

+5V

X1

X2

4

Q B

4

Q

4

Q

B

B

5

Q C

A1

1

5

Q C

A1

1

5

Q C

A1

1

J7

6

Q D

A2

2

6

Q D

A2

2

6

Q D

A2

2

+5V IN

2

10

Q E

CLK

8

10

Q E

CLK

8

10

Q E

CLK

8

11

Q F

R

9

11

Q F

R

9

11

Q F

R

9

R27

R28

3.01K

3.01K

12

Q G

Q

H

13

12

Q G

Q

H

13

12

Q G

Q

H

13

74HC164

74HC164

74HC164

DATA

J7

R25

13

X5

12

11

X5

10

1

J7

R26

1

X5

2

3

X5

4

+5V

+5V

CLOCK

3

C5

C6

1

RESET 1

VCC

14

2

DATA 1

RESET 2

13

330p

330p

J7

50V

50V

3

CLOCK 1

DATA 2

12

COMMON

4

4

SET 1

CLOCK 2

11

5

Q1

SET 2

10

+5V

6

/Q1

X4

Q2

9

7

GND

54HC74

N.C.

8

14

14

14

14

14

X1

C2

X2

C3

X3

C4

X4

C7

X5

C8

GENERAL INFORMATION

LAST NO. USED

74HC164

74HC164

74HC164

54HC74

HEXINV

ELECTRICAL SYMBOLS PER E1537

R-

28

CAPACITORS =

MFD ( .022/50V

UNLESS OTHERWISE SPECIFIED)

LABELS

C-

8

7

7

7

7

7

RESISTORS = Ohms (

1/4W

UNLESS OTHERWISE SPECIFIED)

D-

2

DIODES =

1A, 400V

(UNLESS OTHERWISE SPECIFIED)

SUPPLY

VOLTAGE NET

NOTES :

POWER SUPPLY SOURCE POINT

NOTE: ALL UNMARKED RESISTORS = 100 OHMS

COMMON CONNECTION

N.A. SINCE COMPONENTS OR CIRCUITRY ON A PRINTED CIRCUIT BOARD MAY CHANGE

FRAME CONNECTION

WITHOUT AFFECTING THE INTERCHANGEABILITY OF A COMPLETE BOARD, THIS DIAGRAM MAY

NOT SHOW THE EXACT COMPONENTS OR CIRCUITRY OF CONTROLS HAVING A COMMON CODE

EARTH GROUND CONNECTION

NUMBER.

UNLESS OTHERWISE SPECIFIED TOLERANCE

Ch'ge.Sht.No.

THE LINCOLN ELECTRIC CO.

EQUIP.

CV WELDERS

ON HOLES SIZES PER E-2056

2-16-90

TYPE

ON 2 PLACE DECIMALS IS + .O2

ON 3 PLACE DECIMALS IS + .OO2

4-30-93A

CLEVELAND, OHIO U.S.A.

SUBJECT

METER P.C. BOARD SCHEMATIC

ON ALL ANGLES IS + .5 OF A DEGREE

MATERIAL TOLERANCE ("t") TO AGREE

SCALE

NONE

SHT.

M 15892

WITH PUBLISHED STANDARDS

JCP

01-06-89

CHK.

SUP'S'D'G.

DR.

DATE

NO.

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 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.