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

– 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)

– 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 21,

22)

– 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)

– 25 – – 26 –

3-9. SCHEMATIC DIAGRAM – SPEAKER SECTION –

• See page 43 for IC Block Diagrams.

STR-DB725/DB825

(Page 38)

(Page 37)

(Page 31)

(Page 41)

(Page 38)

(Page 31)

(Page 18)

– 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)

– 33 – – 34 –

3-13. SCHEMATIC DIAGRAM – FRONT PANEL SECTION –

STR-DB725/DB825

(Page 32)

(Page 32) (Page 31)

(Page 18)

– 37 – – 38 –

3-15. SCHEMATIC DIAGRAM – POWER AMP SECTION –

STR-DB725/DB825

(Page 25)

(Page 41)

(Page 26)

(Page 31)

(Page 25)

(Page 17)

(Page

18)

(Page 25)

– 41 –

3-17. SCHEMATIC DIAGRAM – TRANS SECTION –

STR-DB725/DB825

(Page 38)

(Page 26)

– 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

OUTPUT 2

Vcc

GND

INPUT 2

INPUT 1

MOTOR

DRIVE

MOTOR

DRIVE

REG

SWITCH

OUTPUT1

IC251 NJM2296D

S6 S7

S1 S2

Vout1

Vout2 Vout3

V-

GND

SW3

SW2SW1

SW5 SW4

Vin1 Vin2

Vin3Vin4Vin5

V+

10111213141516

1 52 3 4 6 7 8

IC302 LC7822

CONTROL

LATCH

SHIFT RESISTOR

LEVEL SHIFT

VEE

OUT

VSS

RESET

VDD

OUT

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