Sony STR-DB725 User manual

– 1 –

MICROFILM

AEP Model

UK Model

SPECIFICATIONS

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

STR-DB725/DB825

— Continued on next page —

Photo: STR-DB825

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– 13 – – 14 –

STR-DB725/DB825

3-3. SCHEMATIC DIAGRAM – VIDEO INPUT SECTION –

• See page 43 for IC Block Diagrams.

(Page 21)

(Page 32)

(Page 17)

(Page 21)

All manuals and user guides at all-guides.com

– 17 – – 18 –

STR-DB725/DB825

3-5. SCHEMATIC DIAGRAM – INPUT SECTION –

• See page 43 for IC Block Diagrams.

(Page 32)

(Page

14)

(Page

37) (Page 31, 32) (Page 33)

(Page

26)

(Page

25)

(Page

37)

(Page 22)

(Page 22)

(Page 21,

22)

All manuals and user guides at all-guides.com

– 21 – – 22 –

STR-DB725/DB825

3-7. SCHEMATIC DIAGRAM – S-VIDEO SECTION –

• See page 43 for IC Block Diagrams.

(Page 14) (Page 14) (Page 18) (Page 18)

(Page 18)

All manuals and user guides at all-guides.com

– 25 – – 26 –

3-9. SCHEMATIC DIAGRAM – SPEAKER SECTION –

• See page 43 for IC Block Diagrams.

STR-DB725/DB825

(Page 38)

(Page 37)

(Page 37)

(Page 31)

(Page 41)

(Page 38)

(Page 31)

(Page 18)

(Page 18)

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– 31 – – 32 –

3-12. SCHEMATIC DIAGRAM – DISPLAY SECTION –

• See page 11 forWaveforms.

• See page 46 for IC Pin Function.

STR-DB725/DB825

(Page

34)

(Page

26)

(Page

38)

(Page

26)

(Page 17,18) (Page 14) (Page 17)

(Page

34)

(Page

34)

(Page

33)

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all-guides.com

– 33 – – 34 –

3-13. SCHEMATIC DIAGRAM – FRONT PANEL SECTION –

STR-DB725/DB825

(Page 32)

(Page 32)

(Page 32) (Page 31)

(Page 18)

All manuals and user guides at all-guides.com

– 37 – – 38 –

3-15. SCHEMATIC DIAGRAM – POWER AMP SECTION –

STR-DB725/DB825

(Page 25)

(Page 41)

(Page 41)

(Page 26)

(Page 31)

(Page 25)

(Page 17)

(Page

18)

(Page 25)

All manuals and user guides at all-guides.com

– 41 –

3-17. SCHEMATIC DIAGRAM – TRANS SECTION –

STR-DB725/DB825

(Page 38)

(Page 38)

(Page 26)

All manuals and user guides at all-guides.com

– 43 –

3-19. IC BLOCK DIAGRAMS

IC001, 601, 701 uPC2581V

PROTECTOR

DRIVE

12 3 4 5 6 7 8 9 10 11 12 13 14 15

PRE

DRIVE

PRE

DRIVE

BIAS CIRCUIT

REG DRIVE

MUTE

+VOUT1

–VOUT1

COMP1

NF1

IN1

GND

IN2

NF2

COMP2

–VOUT2

+VOUT2

VCC1

VCC2

VEE

IC106 BA6208

1 2 3 4 5 6 7 89

NC

OUTPUT 2

Vcc

GND

NC

INPUT 2

INPUT 1

NC

MOTOR

DRIVE

MOTOR

DRIVE

REG

SWITCH

SWITCH

OUTPUT1

IC251 NJM2296D

9

S5

S6 S7

S4

S1 S2

S3

Vout1

Vout2 Vout3

V-

GND

SW3

SW2SW1

SW5 SW4

Vin1 Vin2

Vin3Vin4Vin5

V+

10111213141516

1 52 3 4 6 7 8

IC302 LC7822

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

30

29

28

27

26

25

24

23

22

21

20

19

18

17

16

CONTROL

LATCH

SHIFT RESISTOR

LEVEL SHIFT

CL

DI

CE

VEE

OUT

IN

OUT

IN

OUT

IN

VSS

S

RESET

VDD

OUT

IN

IN

OUT

IN

OUT

IN

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