EFJohnson 761X, 764X service manual UHF 7640 Main Board TOP View, J4 T o O p tion al Un it

J4 (T o O p tion al Un it)

		W 6	A N T E N N A JA C K
		V C C
		G N D
M P 1 0			E P 1 2
		D 2 8	W 2
J 6
2 - G nd	J 6
1 - H V	1	W 6

L1

D 1 6

B L K

IC 5

M P 8

W 6

R E D

C 1 9 6

R 1 7 3

E P 2

E P 2

C 1 9 5

E P 2

C 8 4

+

C 99

C 95

C 33 7

C 94

W 8

C 98

C 28 5

C 96

R 6 9

Q 1 8

Q 1 7

C 9 2

C 8 1

C 1 0 1 L 1 7

C 28 6

C 97

L1 6

D 3

L2

Q 1 4

R 6 6

C 1 0 0

I IC 3 O

L3

R 1 1 3

W 1 0

L6

R 6 5

C 7 9

C 93

C 13

C 9 1

R 1 1 2

C 3 0 4

R 9

R 8

R 7 0

C 8 0

W 1 2

L 1 9

C 18

C 17

C P U 5

C 34 2

D E T

D 5

Q 1 3

C 1 9 4

C 2 9 8

Q 44

Q 45

L4

D 4

L5

C 7 4

W 1 1

Q 1 2

C 31 4

D 6

IC 2

R 5 8

C 32 9

IC 9

C 7 7

T 8

8 V

C 31 5

C 30 9

L7

C 1 9 9

C 33 0

C 7 6

30- G N D

29- 5 V

28- H V

27- M IC M U T E

26- A F O N O P

25- B E E P O U T

24- R X M U T E

23- D E T

22- A F O U T

21- N C

20- O P C S

19- O P IN T

18- S O

17- S I

16- S C K

1- P T T IN

2- P T T O U T

3- M IC O U T

4- N C

6 - N C

5- B U S Y

7- N C

8- S IG O U T

9- O P T 1

10- O P T 2

11- O P T 3

12- G N D

13- O P V 3

14- O P V 2

15- O P V 1

C 7 8

R 8

C 3 2 6

C 3 2 8

C 1 9 8

M P 1, 2

C 31 0

C 7 0

C 14 2

C 3 2 5

R 11 5

C 29 5

L8

C 14 1

C 6 8

C 6 7

T M U T

C 3 2 7 C 2 0 6 R 1 8 7 R 1 8 9

C P 1

R 11 7

C 34 8

J2 (T o S p kr)

C 2 3 8

C 7 5

C 7 1

R 1 9 0

R 11 6

C 16 7

R 17 C 31 7

2 - S P G N D

R 1 8 8

L 2 3

C 14 3

Q 23

R 14 0

L9

R 2 0 6

C 2 1 3

C 14 5 C 34 6

J 2

R 1 9 1

C 31 3

1 - S P

1

C 2 3 2

C 14 4

R 13 5

L1 0

C 2 8 1

5 V

C 2 0 9

R 2 0 4

R 12 5

R 13 4 C 16 1

R 13 9

W 9

R 2 0 5

IC 1 3

R 1 1 0

C 15 0 R 12 3

R 20

Q 30

L3 0

R 13 8

C 31 1

D 2 5

L 2 6

R 12 4

C 16 2

C 16 5

X 2

C 15 1

R 1 1 1

D 2 4

C 2 1 1

Q 25

C 15 4

R 13 6

L3 1

L1 1

C 2 8 9

Q 3 7

T X C

C 15 2

C 16 3

C 16 4

E X T M

J5 (T o O p t Ca ble )

C 2 0 7

C 15 3

J3 (T o F ro nt U nit)

1 1	C 2 1 2
C 17 8	R 2 6 7
	C 31 2

1 - 8V

3- C P U 5 V

5- G N D

7- O P IN T

9- O P C S

11- B U S Y

13 - B E E P O U T

15- T O N E

17- B E E P

19- D T C S

21- R F A T T

23- N O IS

25- U N LK

27- E X E N

29- E X S T

31- D A S T

33- P LS T

35- V IN

37- T E M P

39 - M IC

2 - 5V

4- A F O

6- S I

8- O P T 3

10- O P T 2

12- O P T 1

14- O P V 3

16- O P V 2

18- O V P 1

20- P T T

22- P T T IN

24- D E T

26- P W O N

28- E X P T T

30- D IM IN

32- S O

34- S C K

36- S O

38- L V IN

40- G N D

11 - P T T

C 2 3 4

R 1 8 6

R 9

6

R 9 7

Q 2

2 R 95 R 96

10 - G N D

9 - IN

C 2 3 6

R 2 0 8

C 44

C 45

8 - G N D

C 2 3 5

C 3 3 5

L1 4

IC 1 1

R 1 0 9

IC 6

R 94

F I3

F I2

7 - D IS C

R 21 3

C

3 3 1

C

1 3

4

6 - G N D

J 5

R 21 4

C 3 3 4

R 1 0 8

R 32

C 2 8 7

L1 3

5 - A F O

R 2 2 3

C 12 6

4 - G N D

R 21 5

R 21 7

C 1 7 7

R 1 0 7

C 1 3 3

C 12 7

3 - H O R N

Q 3 9

C 24 2

C 3 3 3

R 1 9 8

C 3 3 2

R 1 4 6

R 1 4 8

R

99

2 - D IM

R 21 6

R 2 3 2

C 1 7 6+

C 12 9

R 44

C 30 3

1 - H V

Q 3 8

C 2 2 5

R 10 0

R 45

C 63

C 12 8

C 24 1

2

40

Q 3 6

R 2 5 8

R 47

R 48

R 21 8

J 3

C 62

F I1

1

39

C 28 2

R 10 1

R 36

1

C 2 8 8

R 1 4 8

C 61 C 58

1

15

R 14 7

+

R 46

J 4

R 2 3 8

C 2 7 4

C 2 6 3

R 2 5 1

C 13 0

C 57

C 49

F I1

30

16

R 2 4 6

R 2 4 8

C 2 7 2

Q 4 0

R 1 5 3

X 1

R 40

IC 1

C 50

C 2 7 9

L1 5

R 2 3 6

R 1 5 5

C

56

C 3 4 9

C 52

C 2 3 9

C 2 6 4

C 2 6 2

R 2 6 5

C 51

R 2 4 5

R 41

R 2 4 7

C 2 7 3

C 2 7 1

R 2 3 7

R 2 3 9

UHF (7640) MAIN BOARD TOP VIEW	November 1998	8-8
	Part No. 001-7600-001