Sony STR-DB900 Service Manual

STR-DB900

SERVICE MANUAL

Ver 1.0 2004.08

Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.

“DTS” and “DTS Digital Surround” are trademarks of Digital
Theater Systems, Inc.

SPECIFICATIONS

AEP Model

UK Model

E Model

Amplifier section

POWER OUTPUT
Rated power output in stereo mode
(8 ohms, 1 kHz, DIN) 120 W + 120 W
Reference power output
(8 ohms, 20 Hz – 20 kHz, THD 0.7%)

FRONT*: 100 W + 100 W
CENTER*: 100 W
SURROUND*:100 W + 100 W

SURROUND BACK*:100 W
* Depending on the sound field settings and source being used, there
may be no sound output.
Inputs (Analog) Sensitivity: 500 mV
Impedance: 50 kilohms
Inputs (Digital)
DVD (Coaxial) Impedance: 75 ohms
Outputs
LINE (subwoofer) Voltage: 2 V

Impedance: 1 kilohm

FM tuner section

Tuning range 87.5 – 108.0 MHz
Antenna terminals 75 ohms, unbalanced
Intermediate frequency 10.7 MHz

AM tuner section

Tuning range 531 – 1,602 kHz
Antenna Loop antenna
Intermediate frequency 450 kHz

General

Receiver

Power requirements 230 V AC, 50/60 Hz
Power consumption 130 W
Dimensions (w/h/d) 430 × 85 × 400 mm

including projecting parts and
controls

Mass (approx.) 6.2 kg

Remote control

Remote control system Infrared control
Power requirements 3 V DC with two R6 (size-AA)

batteries

Dimensions 210 × 49 × 25 mm
Mass (approx.) 85 g excluding batteries

Supplied accessories

FM wire antenna (1)
AM loop antenna (1)
Remote commander (1)
R6 (size AA) batteries (2)

Design and specifications are subject to change without notice.

9-879-123-01

2004H0278-1
© 2004.08

FM STEREO FM/AM RECEIVER

Sony Corporation

Audio Group
Published by Sony Engineering Corporation

STR-DB900

Unleaded solder

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

: LEAD FREE MARK

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40°C higher than

ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam­aged by heat.

TABLE OF CONTENTS

1. SERVICING NOTES

1-1. AMP Board, DIGITAL Board Service Position .............. 3

1-2. Note on Checking AMP Board or DIGITAL Board

While Turning on Electricity........................................... 3

1-3. Note on AMP Board Removal......................................... 4

1-4. Note on Heat Sink Installation ........................................ 4

1-5. Note on Checking POWER Board While Turning on

Electricity 1 ..................................................................... 5

1-6. Note on Checking POWER Board While Turning on

Electricity 2 ..................................................................... 5

2. GENERAL ................................................................... 6

3. TEST MODE ............................................................... 7

4. DIAGRAMS

4-1. Block Diagram — INPUT/TUNER Section — ............. 13

4-2. Block Diagram — AUDIO DSP Section —................... 14

4-3. Block Diagram — DAMP Section — ............................ 15

4-4. Block Diagram — DISPLAY Section — ....................... 16

4-5. Schematic Diagram — DIGITAL Section (1/3) —........ 17

4-6. Schematic Diagram — DIGITAL Section (2/3) —........ 18

4-7. Schematic Diagram — DIGITAL Section (3/3) —........ 19

4-8. Printed Wiring Board — DIGITAL Board (Side A) —.. 20
4-9. Printed Wiring Board — DIGITAL Board (Side B) —.. 21

4-10. Printed Wiring Board — AMP Board (Side A) — ......... 22

4-11. Printed Wiring Board — AMP Board (Side B) —......... 23

4-12. Schematic Diagram — AMP Board (1/4) — ................. 24

4-13. Schematic Diagram — AMP Board (2/4) — ................. 25

4-14. Schematic Diagram — AMP Board (3/4) — ................. 26

4-14. Schematic Diagram — AMP Board (4/4) — ................. 27

4-15. Printed Wiring Board

— VIDEO, ANALOG IN Board — ................................ 28

4-16. Schematic Diagram

— VIDEO, ANALOG IN Board — ................................ 29

4-17. Printed Wiring Board — DISPLAY Section — ............. 30

4-18. Schematic Diagram — DISPLAY Section —................ 31

4-19. Printed Wiring Board — POWER Section —................ 32

4-20. Schematic Diagram — POWER Section — .................. 33

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PAR TS WHOSE PART NUM­BERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE­MENTS PUBLISHED BY SONY.

2

5. EXPLODED VIEWS

5-1. Case Section .................................................................... 43

5-2. Front Panel Section ......................................................... 44

5-3. Chassis Section................................................................ 45

6. ELECTRICAL PARTS LIST .................................. 46

SECTION 1

SERVICING NOTES

1-1. AMP BOARD, DIGITAL BOARD SERVICE POSITION

In case of checking AMP board or DIGITAL board from bottom side, please remove those with back panel.

AMP board

back panel

STR-DB900

DIGITAL board

insulating sheet

1-2. NOTE ON CHECKING AMP BOARD OR DIGITAL BOARD WHILE TURNING ON ELECTRICITY

In case of checking AMP board or DIGITAL board while turning on electricity , please connect with an crocodile clip connector betw een back
panel and chassis.

AMP board

DIGITAL board

back panel

chassis

crocodile clip connector

3

STR-DB900

1-3. NOTE ON AMP BOARD REMOVAL

In case of removing AMP board,
remove these 6 screws first, it is
easy to remove it.

AMP board

1-4. NOTE ON HEAT SINK INSTALLATION

Be sure to install it in the direction as shown in the figure.

AMP board

insulating sheet

heat sink

4

STR-DB900

1-5. NOTE ON CHECKING POWER BOARD WHILE TURNING ON ELECTRICITY 1

In case of checking POWER board while turning on electricity , please connect with crocodile clip connectors between two ground terminals
(EP902, 904) and chassis.

POWER board

EP904

EP902

crocodile clip connector

chassis

crocodile clip connector

1-6. NOTE ON CHECKING POWER BOARD WHILE TURNING ON ELECTRICITY 2

Do not touch the capacitor (C916) on POWER board while turning on electricity, because of the voltage becomes 350VDC (Max.).

BOARDPOWER (SIDE B)

C916

5

STR-DB900

SECTION 2

GENERAL

List of button locations and reference pages

Main unit

ALPHABETICAL ORDER NUMBERS AND SYMBOLS

DIRECT qa
DISPLAY 6
Display window 4
INPUT MODE 5
INPUT SELECTOR 7
MULTI CH IN qs
PHONES jack qg
POWER (power) switch 2

PRESET TUNING +/– qf
SOUND FIELD q;
STANDBY indicator 3
SURROUND BACK

DECODING qd

VOLUME 8

(remote sensor) 1

2CH 9

This section is extracted
from instruction manual.

2 8

qg qf qd qs qa

4

q;

9

65371

6

SECTION 3

TEST MODE

[FL TEST MODE]

Fluorescent segments display test

Procedure:

1. Press the [POWER] button to turn the set off.

2. To enter the test mode, while pressing the two buttons [DISPLAY] and [SOUND FIELD], press [POWER] button.

3. All segments turn on.

4. To exit from this mode, press the [POWER] button to turn the set off.

[VERSION CHECK]

Firmware Version Check

Procedure:

1. Press the [POWER] button to turn the set off.

2. To enter the test mode, while pressing the two buttons [DIRECT] and [SOUND FIELD], press [POWER] button.

3. The message version “ DB9 CE 1.05 ” is displayed.

4. To exit from this mode, press the [POWER] button to turn the set off.

[KEY CHECK]

Check the buttons operate normally or not.

STR-DB900

Procedure:

1. Press the [POWER] button to turn the set off.

2. To enter the test mode, while pressing the two buttons [DIRECT] and [SURR BACK DECODING], press [POWER] button.

3. The message “ RESET ** ” is displayed.
**: Number of buttons

4. Every time you press the button, ** counts down one by one.

5. In case of every buttons are pressed, the finished indication “ RESET 00 ” appears.

6. To exit from this mode, press the [POWER] button to turn the set off.

[SWAP ALL MODE]

Outputs of speakers checking mode. The L/R channel signals output from all of the speakers.

Procedure:

1. Press the [POWER] to turn the set off.

2. To enter the test mode, while pressing the two buttons [INPUT MODE] and [MULTI CH IN], press [POWER] button.

3. The message “ SWAPMODE ” is displayed.

4. The L/R channel signals output from all of the speakers.

5. In this mode, every time pressing [PRESET +] button, VOLUME LEVEL changes.

VOL MIN VOL 34 VOL MAX

6. To exit from this mode, press the [POWER] button to turn the set off.

[HISTORY MODE]

Display of the internal information on the protector being activated.
(SF, Volume level value, Tone setting, Operating time)

Procedure:

1. Press the [POWER] button to turn the set off.

2. To enter the test mode, while pressing the two buttons [INPUT MODE] and [SURR BACK DECODING], press [POWER] button.

7

STR-DB900

d

3. Select the display contents with cursor [ / ] buttons on the remote commander.

Note: In case of pressing buttons except for cursor [ / ] buttons, the Test Mode is released.

HISTORY

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

f

f

f

f

f

f

button

button

button

button

button

button

F f

00

Display item number

10

20

30

40

01

F f

Volume level (-40dB and below) operating time

Volume level (From -20dB to -39dB) operating time

Volume level (From -10dB to -19dB) operating time

Volume level (From 0dB to -9dB) operating time

Power ON total time

Operating time on the protector being activated

button

F

VOL * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

button

F

* * * * * * * *

f

f

f

f

f

f

f

button

11

button

21

button

31

button

41

button

51

button

61

button

71

Volume level display value on the protector being activated

Sound Field name display on the protector being activated

Input Selector name display on the protector being activated

Input Mode display on the protector being activated

Input signal format type display on the protector being activated

Configuration (Channel) display on the protector being activate

Speaker setting display on the protector being activated

button

F

* * * * * * * *

button

F

* * * * * * * *

**---* : Each data display or numerical value.

Operating time display : Display in units of 5 minutes (Unit: Minutes)

f

f

button

81

button

91

(Ex.: 27 minutes - “25”, 10 minutes - “10”, 38 minutes - “35”, 20 hours - “1200”,
1 year - “525600”, 5 years - “2628000”

Bass level display on the protector being activated

Treble level display on the protector being activated

8

(Display example on the protector being activated.)

• Item Number 01:

25 01

On 27 minutes operating time

STR-DB900

Operating Time

• Item Number 11:

• Item Number 21:

• Item Number 31:

• Item Number 41:

• Item Number 51:

Item Number

25 11VOL

PL 21DOLBY

31DVD

41AUTO IN

41DIGITAL

41COAX IN

41OPT IN

41ANALOG

51DOLBY D

Volume level "25" display

Sound Field name display; DOLBY PRO LOGIC

Input selector display; DVD

In using AUTO mode

NET MEDIA

COAX FIX

OPT FIX

ANALOG FIX

DOLBY DIGITAL signal input

• Item Number 61:

613/2 +LFE

• Item Number 71:

71HP IN

71SP ON

• Item Number 81:

81BASS -06

• Item Number 91:

91TREB -03

• In case of the protector has never activated.:

YZ________

4. To exit from this mode, press the [POWER] button to turn the set off.

[3/2.1] signal input

Headphones is inserted.

Headphones is not inserted

Tone Bass Level is -6dB

Tone Treble Level is -3dB

All segments are "-"

Item Number

9

STR-DB900

• Circuit Boards Location

AC SW board

SECTION 4

DIAGRAMS

REG board

AMP board

DIGITAL board

POWER board

LED board

HP board

VIDEO board

ANALOG IN board

tuner unit

DISPLAY board

VOL board

10

NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this necessary note is printed in each block.)

STR-DB900

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. (p: pF)
50 WV or less are not indicated except f or electrolytics and
tantalums.

• All resistors are in Ω and 1/
specified.

• % : indicates tolerance.

• f : internal component.

• 2 : nonflammable resistor.

• C : panel designation.
Note: The components identified by mark 0 or dotted

line with mark 0 are critical for safety.
Replace only with part number specified.

• A : B+ Line.

• B : B– Line.

•Voltages and w av ef orms are dc with respect to ground un­der no-signal conditions.
No mark : FM
* : Impossible to measure

•Voltages are tak en with a VOM (Input impedance 10 MΩ).
Voltage v ariations ma y be noted due to normal production
tolerances.

•Waveforms are taken with a oscilloscope.
Voltage v ariations ma y be noted due to normal production
tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F : FM
g : VIDEO

•Abbreviation
SP : Singapore model
MY : Malaysia model

4

W or less unless otherwise

Note on Printed Wiring Board:

• X : parts extracted from the component side.

• a : Through hole.

• : Pattern from the side which enables seeing.
Caution:

Pattern face side: Parts on the parts face side seen from
(Side A) the parts face are indicated.
Parts face side: Parts on the pattern face side seen from
(Side B) the pattern face are indicated.

•Abbreviation
SP : Singapore model
MY : Malaysia model

11

STR-DB900

•Waveforms
– DIGITAL Board –

1

IC217 qd CKOUT (O)

6

IC206 qs MCLK2

– AMP Board –

1

IC325 4

4

CN315 wa BCKO

1V AC/DIV, 50 nsec/DIV

2

3

4

5

80 nsec

IC217 qf BCK (O)

0.33 µsec

1V AC/DIV, 0.2

IC217 qg LRCK (O)

21 µsec

1V AC/DIV, 10

IC217 w; XMCK (O)

1V AC/DIV, 50 nsec/DIV

IC217 wa XOUT (O)

µ

µ

80 nsec

sec/DIV

sec/DIV

3 Vp-p

3.3 Vp-p

3.3 Vp-p

3.1 Vp-p

74 nsec

1V AC/DIV, 50 nsec/DIV

7

IC206 qf SCKOUT

80 nsec

1V AC/DIV, 50 nsec/DIV

8

IC206 ql LRCKO

21 µsec

1V AC/DIV, 10

9

IC206 w; BCKO

0.33 µsec

1V AC/DIV, 0.1

0

IC202 <zvc X-OUT

µ

sec/DIV

µ

sec/DIV

3.3 Vp-p

3.3 Vp-p

3.3 Vp-p

3.3 Vp-p

20 nsec

2V AC/DIV, 20 nsec/DIV

2

IC301 wk XFSOIN

1V AC/DIV, 20 nsec/DIV

3

1V AC/DIV, 20 nsec/DIV

20 nsec

IC301 uj XFSOOUT

20 nsec

5.2 Vp-p

1.8 Vp-p

3.3 Vp-p

0.33 µsec

1V AC/DIV, 0.1

5

CN315 wd LRCKO

21 µsec

1V AC/DIV, 10 µsec/DIV

6

CN315 wg CSCK

2V AC/DIV, 50 nsec/DIV

µ

80 nsec

sec/DIV

4 Vp-p

3.3 Vp-p

4.7 Vp-p

80 nsec

1V AC/DIV, 50 nsec/DIV

– ANALOG IN Board – – DISPLAY Board –

1

IC108 4

1V AC/DIV, 50 nsec/DIV

80 nsec

3.3 Vp-p

3.3 Vp-p

80 nsec

1V AC/DIV, 50 nsec/DIV

3.5 Vp-p

1

IC802 5 OSC

1V AC/DIV, 1

2.3 µsec

µ

sec/DIV

2.0 Vp-p

12

4-1. BLOCK DIAGRAM — INPUT/TUNER SECTION —

STR-DB900

ANTENNA

COAXIAL

DIGITAL

FM

75Ω

AM

MULTI

CH IN

ANALOG

OPTICAL

VIDEO

FM/AM TUNER

TM101

ST-DI/MC-DO

ST-DI/MC-DI

FRONT

SURROUND

CENTER

SUB WOOFER

DVD

IN

VIDEO

IN

DVD IN

COAXIALIN

HDD/MD

IN

HDD/MD

OUT

DVD IN

TV/SAT

VIDEO

DVD IN

TV/SAT

MONITOR

OUT

L CH
R CH

TUNED

STEREO

MUTE

CLK

FM SIG OUT

RDS-DATA

RDS-INT

L

R

L

R

L

R

L

R

IN

IN

IN

8
10

TU-TUNED

6

TU-STEREO

7
11

TU-MUTE

3

TU-DATA
TU-DO

2
1

TU-CLK
TU-LATCH

4

CE

13

RDS-SIG

15

RDS-DATA

14

RDS-INT

AEP,UK MODEL

J102

R-CH

R-CH

J101

R-CH

R-CH

J201

IR RECEIVER

IC213

IR TRANSMITTER

IC212

IR RECEIVER

IC218

IR RECEIVER

IC214

J701

J702

R-CH

ASEL-A

ASEL-B

3

5

D807
D806

BUFFER

IC102

BUFFER

IC104

BUFFER

IC106

1

7

6
5
4
3

9

VOUT1

VOUT2

INPUT SELECT

IC211

1C0
1C1
1C2
1C3

2Y

10

5

NC

A/D CONVERTER

IC103

1

VINL DOUT

A/D CONVERTER

BCK

LRCK

SCKI

PDWN

12
11
10

15

7

IC105

13 1

VINL DOUT

A/D CONVERTER

BCK

LRCK

SCKI

PDWN

12
11
10

15

7

IC107

1

VINL

2

VINR

DOUT

BCK

LRCK

SCJI

PDWN

12
11
10

15

+10V

7

41

+10V REG.

3 1

IC109

IC108

ADC-MCK

ADC-RST

+12V

DIR

IC217

1Y

7 3 16

Q202

2C0
2C1
2C2
2C3

A

14

2

B

10
11
12
13

Q201

DSEL-A

DSEL-B

X203

12.288MHz

20

22

21

DIN0(I)

XMCK(O)

XIN(I)

XOUT(O)

LPF(0)

10

DELAY

Q203,204

DATA(O)

BCK(O)

LRCK(O)

CKOUT(I)

AUDIO-(O)

XMODE(I)

CKSEL1(I)

CL(I)
CE(I)

DI(I)

DO(O)

ERROR(O)

ADC-DATA-L/R
ADC-DATA-SL/SR
ADC-DATA-C/SW
DIR-DATA
BCK
LRCK

CONT-1

AUDIO DSP

A

SECTION

(Page 14)

14
15

13

24

48
47
38
37

36
35
34

MCK

DIR-AUDIO

DIR-XMODE

DIR-CKSEL

DIR-CLK

DIR-CE

DIR-DI

DIR-DO

DIR-ERR

CONT-2

• R-ch is omitted due to same as L-ch.

• Signal path
: FM

: VIDEO

INPUT SELECT

IC101

11

X3
X2

15
14

X1

12

X0

WAVE

SHAPER

3 2

13 3 1

X

Q102

10

A

B

9

Q101

IC216

1

3

1

1

VIDEO INPUT SELECT

IC701

VIN1

12

VIN3

1

VIN2

3

2 13 114

VSEL-A

VSEL-B

STR-DB900

1313

STR-DB900

4-2. BLOCK DIAGRAM — AUDIO DSP SECTION —

DATA SELECT

IC210

6

SEL

1

DIR-DATA

ADC-DATA-L/R

ADC-DATA-SL/SR

ADC-DATA-C/SW

BCK

LRCK

A

INPUT/
TUNER

SECTION

(Page 13)

CONT-1

CONT-2

A

2

B

SDRAM

IC203

D0

D15

A15

Y

I

A0

I

WE

CS

5 30

7-10,13-16,

29-32,35-38

5-1,44-42,

27-24,21-28

17

6

X202

13.5MHz

18

114

17
15

108,105-102,99,

98,80-77,

112,110,109,

97-92,82,

45
44

9

12

SDI2

SDI1

SDI3

BCKI1
LRCKI1

D0

I

D

•

D08/GP0

I

75-72

D15/GP7

A0

I

A15

85-83,66-62

WEO
CSO

MCLK1

MCLK2

AUDIO DSP

IC206

+3.3V

SDO1
SDO3
SDO2
SDO4
BCKO

LRCKO

SCKOUT

BST

HACN

HDIN

HCLK

HDOUT

HCS

GP12

GP9

PM

XRST

EXLOCK

KFSIO

GP8

+3.3V

REG.

3 1

IC205

113

23
25
24
26
20
19
14

BST SELECT

DATA-L/R
DATA-C/SW

DATA-SL/SR
DATA-SB

BCKO
LRCKO
SCK

IC204

2

56

32
33
34
35
36
37
68

2

59

22
69

5

Y

+5V

B
A

SEL

6

DIR-AUDIO

1

MCK

DIR-ERR

TU-TUNED
TU-STEREO
TU-MUTE
TU-DATA
TU-DO
TU-CLK
TU-LATCH

RDS-SIG
RDS-DATA
RDS-INT

ASEL-A
ASEL-B

DSEL-A
DSEL-B

VSEL-A
VSEL-B
ADC-RST

DIR-XMODE
DIR-CKSEL
DIR-CLK
DIR-CE
DIR-DI
DIR-DO

6

DSP-BST

19

SDI2-SEL

8

DSP-BSTSEL

5

DSP-HACN

174

DSP-DI

173

DSP-CLK

1

DSP-DO
DSP-CS

4
9

DSP-GP12

7

DSP-GP9

3

DSP-PM

2

DSP-RST

14

DIR-ERR

155

TUN-TUNED

156

TUN-STEREO

157

TUN-MUTE

153

TUN-DATA

152

TUN-DO

151

TUN-CLK

154

TUN-LAT

53

RDS-SIGNAL

158

RDS-DATA

102

RDS-INT

170

ASEL-A
ASEL-B

169

44

DSEL-A
DSEL-B

43
73

VSEL-A
VSEL-B

74

ADC-RST

171

20

XDIR-SEL

22

DIR-CKSEL1

12

DIR-CLK

15

DIR-CE

11

DIR-DI

21

DIR-DO

SYSTEM

CONTROL

IC202 (1/2)

AEP,UK MODEL

XDAMP-RST

XDAMP-NSMUTE

DAMP-DATA

DAMP-CLK

DAMP-CS1-L/R

DAMP-CS2-C/SW

DAMP-CS3-SL/SR

DAMP-CS4-SB

XDAMP-EN

XDAMP-PROTECT

HP-SW

HP-RY-SO1

QS-RY/SW-RY-SO1

XEPROM-DATA

XEPROM-CLK

X-IN

X-OUT

XRESET

MD2

FLASH-SO

FLASH-SI

141

143

144
138
126
125

26
27
24
25
28
29
30
31

32
33

37
39
38

INIT

MUTE

SCDT

SHIFT

LATI-L/R

LATI-C/SW

LATI-SL/SR

LATI-SB

HP SW

PH-RY

RELAY

EEPROM

AMP
CONT

EN
I-LIMIT

B

DAMP

SECTION

(Page 15)

IC209

76
75

5

SDA

6

SCL

RESET

+3.3V

(STBY)

IC201

1 2

X201

12.5MHz

+3.3V

CN202

Q301,302

GND

1

2

3.3V

3

RESET

4

MD2

5

FLASH-SO

6

FLASH-SI

RESET

STOP

FLASH ROM

WRITE

C

DISPLAY
SECTION

(Page 16)

STR-DB900

• Signal path
: FM

1414

STR-DB900

4-3. BLOCK DIAGRAM — DAMP SECTION —

STR-DB900

B

AUDIO DSP

SECTION
(Page 14)

D

DISPLAY
SECTION

(Page 16)

DATA-L/R

DATA-C/SW

DATA-SL/SR

DATA-SB

BCKO

LRCKO

SCK

AMP

CONT

I-LIMIT

P-STOP

CLOCK OSC

IC325

24

21

15

18
10

7
1
4

PCM/PWM

PROCESSOR

IC308

24

21

15

18

10

1

PCM/PWM

PROCESSOR

IC313

24

21

15

18
10

7
1
4

PCM/PWM

PROCESSOR

IC605

24

21

15

18

R-CH

R-CH

R-CH

2

4

DATA-L/R
BCK
LRCK

IC326

BCK17

LRCK

35

SCK

62

EN

SCK
INIT
MUTE
SCDT
SHIFT
LATI-L/R

DATA-C/SW
BCK
LRCK
SCK
INIT
MUTE
SCDT
SHIFT
LATI-C/SW

DATA-SL/SR
BCK
LRCK
SCK
INIT
MUTE
SCDT
SHIFT
LATI-SL/SR

DATA-SB
BCK
LRCK
SCK
INIT
MUTE
SCDT
SHIFT
LATI-SB

43
44
45
64
41
39
38
37
36

73
74

43
44
45
64
41
39
38
37
36

74

43
44
45
64
41
39
38
37
36

74

43
44
45
64
41
39
38
37
36

74

DATA
BCK
LRCK
XFSIIN
INIT
NSPMUTE
SCDT
SCSHIFT
SCLATCH

FSOCKO
FSOI

DATA
BCK
LRCK
XFSIIN
INIT
NSPMUTE
SCDT
SCSHIFT
SCLATCH

FSOI

DATA
BCK
LRCK
XFSIIN
INIT
NSPMUTE
SCDT
SCSHIFT
SCLATCH

FSOI

DATA
BCK
LRCK
XFSIIN
INIT
NSPMUTE
SCDT
SCSHIFT
SCLATCH

FSOI

49.125MHz

28

XFSOIN

XFSOOUT

77

28

XFSOIN

XFSOOUT

77

28

XFSOIN

XFSOOUT

77

28

XFSOIN

X300

PCM/PWM

PROCESSOR

IC301

OUTL1+

OUTL1-

OUTL2+

OUTL2-

OUTL1+

OUTL1-

OUTL2+

OUTL2-

OUTL1+

OUTL1-

OUTL2+

OUTL2-

OUTL2+

OUTL2-

OUTL1+

OUTL1-

OUTL2+

OUTL2-

OUTL1+

OUTL1-

OUTL2+

OUTL2-

OUTL1+

OUTL1-

OUTL2+

OUTL2-

LPF

IC320

3
2

5
6

DEAD TIME

IC302

DEAD TIME

IC303

DEAD TIME

IC309

DEAD TIME

IC310

5
6

WOOFER AMP

IC311

DEAD TIME

IC314

DEAD TIME

IC315

DEAD TIME

IC601

DEAD TIME

IC602

HEADPHONE AMP

IC321

1 3

7 5 7

DIGITAL POWER AMP

IC306

HOUT

5 HIN

LOUT

LIN

6

HSCT

HOUT

5 HIN

LOUT

LIN

6

HSCT

DIGITAL POWER AMP

IC307

DIGITAL POWER AMP

IC319

HOUT

5 HIN

LOUT

LIN

6

HSCT

HOUT

5 HIN

LOUT

LIN

6

HSCT

DIGITAL POWER AMP

IC328

1

DIGITAL POWER AMP

IC329

HOUT

5 HIN

LOUT

LIN

6

HSCT

HOUT

5 HIN

LOUT

LIN

6

HSCT

DIGITAL POWER AMP

IC330

DIGITAL POWER AMP

IC603

HOUT

5 HIN

LOUT

LIN

6

HSCT

HOUT

5 HIN

LOUT

LIN

6

HSCT

DIGITAL POWER AMP

IC604

4

1

J401

PHONES

FRONT

L

FRONT

R

CENTER

SPEAKERS

IMPEDANCE USE

4-16Ω

J301

AUDIO OUT

SUB WOOFER

SURROUND

L

SURROUND

R

SURROUND

BACK

• R-ch is omitted due to same as L-ch.

• Signal path
: FM

DELAY
BUFFER

DELAY
BUFFER

RY301

RY302

Q310

Q311

R-CH

R-CH

+5V

REG.

3 1

IC322

+3.3V

REG.

3 1

IC323

TM301

TM302

TM303

TM304

TM305

TM601

+12V

(GATE)

PH-RY

HPSW

RELAY

AVDD
(+5V)

DVDD

(+3.3V)

RELAY DRIVER

Q305,306

RELAY DRIVER

Q307,308

+12V(DAMP)

IC324(1/2),

+12V(DAMP)

IC324(2/2),

15V-53V

I.PROTECT

Q329

Q356

V.PROTECT

Q317,318

TEMP.DETECT

Q346,347

I.PROTECT

Q360

V.PROTECT

Q321,322

TEMP.DETECT

Q350,351

I.PROTECT

Q362

V.PROTECT

Q323,324

TEMP.DETECT

Q352,353

TEMP.DETECT

Q608,610

I.PROTECT

Q612

V.PROTECT

Q602,606

D316

D322

D321

D315

D323

D317

D601

D602

Q609

Q327

3
8

4

3
8

4

3
8

4

3
8

4

3
8

4

3
8

4

3
8

4

3
8

4

BOOSTER
Q304,309

BOOSTER
Q313,328

BOOSTER
Q334,335

BOOSTER
Q336,337

BOOSTER
Q338,339

BOOSTER
Q340,341

BOOSTER
Q601,602

BOOSTER
Q603,604

PROTECT

CONTROL

LPF

LPF

THP301

15V-53V

LPF

LPF

THP303

15V-53V

LPF

LPF

THP304

THP601

15V-53V

LPF

LPF

1

6

IC327

Q316 Q315 Q314

1515

STR-DB900

4-4. BLOCK DIAGRAM — DISPLAY SECTION —

SEG1

I

SEG16
GR1D1

I

GR1D12

FL DRIVER

IC802

DIN

CLK9STB

8

21

910

122 121

FL-CLK

V-CONT

SYSTEM

CONTROL

IC202 (2/2)

P-CONT1

AC-STOP

FL-LATCH

KEY NETWORK

S802-806
S807-810

D808

STANDBY

RV801

VOLUME

(ENCODER)

RV802

INPUT SELECT

(ENCODER)

IR RECEIVER.

IC801

VOUT

DRIVER

LED

Q803

7

638

45

123

FL-DATA

SIRCS

10013

KEY1

51
50

KEY2-QS-ONLY

116

LED-STANDBY

VOL-UP

120
119

VOL-DOWN

118

INPUT-UP
INPUT-DOWN

117

VEE

14

I

29
42

I

31

30

BUFFER

IC803

+5V

47

86

98

D803

DAMP

SECTION

(Page 15)

AUDIO DSP

SECTION

(Page 14)

RECT.
D801,802
D804,805

D
C

FL801

FLUORESCENT

INDICATOR

TUBE

T801

15V-53V

P-STOP

STOP

+6.5V

+3.3V

+3.3V

(STBY)

DC/DC

CONVERTER

Q801,802

RIPPLE
FILTER

Q990

GATE

Q920,D931

+3.3V

+6.2V

+6.5V

+12V

(DAMP)

+10V

(GATE)

-12V

(DAMP)

+12V

+3.3V REG.

IC908

3 1

VC

8

IN+ OUT

3 1

BUFFER

IC909

D932

(5.6V)

Q902

D920

D921

+5V REG.

Q910

BUFFER

Q906,917

SHUNT

REG.

IC905

GATE

Q905,908

D930

+3.3V REG.

IC910

3 1

+3.3V REG.

IC904

2 1

4 3

3 1

+10V REG.

IC907

3 2

-12V REG.

IC906

+15V REG.

Q912,914

1

REF

1

D933

Q907

RECT.

D913

RECT.

D914

RECT.

D915

T902

+17V REG.

Q901

FB

AMP

Q903

1

DRAIN

VCC

4 3

GND

5

DCB/FB

2

SURCE

SWITCHING

REGULATOR

IC901

1

SHUNT REG.

2

3

IC903

RECT

RECT
D930

3

D919

(+5.6V)

T901

FEED BACK

ISOLATOR

PC901

AC-STOP

ISOLATOR

PC902

D912

+20V REG.

Q904

D905

D906

D929 D903

3

DRAIN

VCC

4

OCP/SYNC

1

GND

2

5

PB/OLP

SWITCHING

REGULATOR

IC902

D902

D904

FL902

FL901

F901

S1

POWER

ON/OFF

~

AC IN

STR-DB900

1616

STR-DB900

4-5. SCHEMATIC DIAGRAM — DIGITAL SECTION (1/3) —

2

21

IC

TX141L

TO

)

ED

(R

262

ITTER

SM

N

A

TR

IR

213

IC

141L

RX

TO

ER

RECEIV

IR

IC214

141L

X

ITAL

IG

D

AL

PTIC

O

J201

1P

IGITAL

D

AXIAL

CO

TOR

ECEIVER

R

IR

IC218
RX141L

TO

RECEIVER

IR

C280

22

25V

C283

0.1

373

R

75

C

0.1

345

R

100

R367

C270

0.1

207-1

344

R

0

R356

207-3

C269

25V

47

207-4

207-5

R
470k

47k

359

207-6

470

207-2

R

100

C

0.1

R354

100

C

0.1

R

100

C276

0.1

346

263

271

363

C278

47

25V

• See page 12 for Waveforms. • See page 34 for IC Block Diagrams.

201

207-7

C260

C

207-8

0.1

261

10

50V

IC211

C153

N74H

S

ELECT

T S

PU

IN

IC216

04F

U

TC7W

APER

AVE SH

W

FB208

H

0U

207-9

207-10

207-11

207-12

207-13

207-15

207-17

207-19

R340

10k

R

10k

343

R

358

0

207-21

FB207

0UH

207-23

207-224

207-225

TC114EK

D

Q

A-T146

TER

ER

V

IN

114EKA-T146

DTC

IN

Q202

VER

202-43

202-44

TER

D

D

203

Q

TC114EKA-T146

ELAY

D

Q204

TC114EKA-T146

ELAY

D

C273

L201

1SS

220
10V

202-14

202-22

202-20

201

D

355

C282

2200000p

R371

47k

355

R
100k

366

R

10k

370

R

5.6k

369

R

47k

C284

3.3
50V

374

R

100

C286

C285

0.1

0.01

R372

C290

220
10V

386

R

1M

202

D

1SS355

C279

0.1

6.8k

C289

C288

0.1

10

C295
470p

C266

0.01

R349

100

348

R

10k

378

R

1k

0UH

FB209

100

R387

0

FB212

22

R382

22

R383

100

R384

C264

10

LC89056W

100

R385

IC217

D

IR

202-10

351

R

100

353

352

R

10k

FB210

380

R

100

350

R

R

10k

100

361

R

4.7k

362

R

100

368

R

3.3k

X

C294

220
10V

C292

203

22p

390

R

R379

1M

H

0U

381

R

3.3k

C293

12.288M

330

0.1

R364

100

C291

C281

0.1

202-11
202-21
202-13

39p

STR-DB900

XSTATE

DATA

LRCK

BCK

202-12

EP202

207

CN

25P

BUS

+3.3V

GND

ITAL

IG

D

AR

BO

(3/3)

(Page 19)

D

D

P

AM

D

AR

BO

(Page 25)

ITAL

IG

D

AR

BO

(2/3)

(Page 18)

CK OUT

XMCK

AUDIO

1717

STR-DB900

4-6. SCHEMATIC DIAGRAM — DIGITAL SECTION (2/3) —

3

IC20

-15TG

6416

LV

61

IC

M

A

R

SD

C240

0.1

R
R
R

R
R
R263
R

R
R260
R259
R

R
R254
R
R252

268
267
266

265
264

262

261

258

255

253

N

G

ALO

AN

RD

A

BO

(Page 29)

234

R

202-96

-97

202
202-109

0

202-11

2

202-11

6-44

20
202-108
202-107
202-105
202-104

C210

0.1

IN

202-103
202-102
202-99
202-98
206-45
206-64
206-65
206-66
206-83

R235

100

CN

100

233

R

100

225

R

100

224

R

100

223

R

100

222

00

R

1

R221

100

220

R

100

219

R

100

232

R

100

R231

100

R230

100

229

R

100

R228

100

R227

100

226

R

100

203

23P

AEP,UK

203-1
203-2
203-3
203-4
203-5
203-6
203-7
203-8

203-9
203-10
203-11
203-12
203-13

XM

CK

• See page 12 for Waveforms. • See page 34 for IC Block Diagrams. • See page 37 for IC Pin Function Description.

12

IC205

2391-26

JM

+3.3V R

C2

0

10

V

16

214

C

0.1

100
100
100

100

00

1
100
100

100
100
100
100

100
100
100
100

EG

C247

202-95
202-94

-93

202

02-92

206-72
206-73
206-74
206-75

206-77
206-78
206-79
206-80

R298

10k

C233

C228

0.1

C234

0.1

10

202-92
206-82
206-85
206-84

FB202

0UH

FB203

H

0U

C241

C248

470

0.1

10V

1

2
202-93
202-94
202-95
202-96
202-97
202-98
202-99

202-102
202-103
202-104
202-105

202-107
202-108
202-109
202-110

202-112

C254

0.01

R

10k

C219

100
16V

13.5M

322

C258

22p

337

R

100

C249

X202

0.1

220

C

0.1

206-75

206-77

206-78

206-80

206-82

206-84

206-83

206-85

323

R

1M

329

R

z

H

1k

C259

22p

C250

0.1

256

C

0.1

206-79

FB206

0U

R

206

IC

9718Q

CXD

SP

D

DIO

AU

H

339

22

206-74

206-73

206-72

C221

0.1

R

R

100

331

FB211

332
220

206-64

206-65

206-66

100

100

100

100

R336

R335

R334

R333

0UH

278

R277

R

100

100

IO

D

U

C245

0.1

C237

FB204

0U

C246

0.1

A

202-7

202-8

204

IC

157FK

H

TC7W

ELECT

AT S

202-6

R

B

206-45
206-44

296
100

202-9
202-4
202-1

SP CLK

D

I

SP D

D

202-5

ATA

D

202-19

02-13

2

R289

100

295

R

100

306

100

R

308

100

R

311

100

R

313

100

R

314

100

R

IC210

157FK

H

TC7W

DATA SELECT

10

H

222

C

0.1

284

R

10k

C223

10

C232

0.1

C230

0.1

STR-DB900

10V

5V

ITAL

IG

D

AR

BO

(3/3)

(Page 19)

LRCK

D

202-3

202-2

207-225

ITAL

IG

D

D

AR

BO

(1/3)

(Page 17)

+3.3V

GND

(Page 19)

BUS

ITAL

IG

D

D

AR

BO

(3/3)

207-13

207-15

207-17

207-19

CK OUT

207-21

207-23

BCK

1818

STR-DB900

4-7. SCHEMATIC DIAGRAM — DIGITAL SECTION (3/3) —

203-12

203-13

DSP DI

DSP CLK

R211

10

C206

R209

0.1
10k

R218

10k

202-1
202-2
202-3
202-4
202-5
202-6
202-7
202-8
202-9

1k

207-10

R375

R238

1k

R240

1k

R243

1k

R246

1k

R249

1k

R256

1k

R269

1k

R270

1k

R271

1k

R272

100

R274

100

R275

100

R276

100

R279

100

R280

100

R282

100

R283

100

R286

10k

R293

1k

R294

C231

R309

1k

0.1

10k

R299

10k

R302

R304

1k

1k

C217

C227

C224

202-11
202-10
202-12

R290

202-13
202-14
XSTATE

202-19
202-20
202-21
202-22

207-3
207-4
207-1
207-2
207-5
207-6
207-7
207-8
207-9

10k

207-11
207-12
207-224

202-43
202-44

0.1

0.1

0.1

• See page 12 for Waveforms. • See page 34 for IC Block Diagrams. • See page 39 for IC Pin Function Description.

Q301

DTC114EKA-T146

RESET

R248

10k

203-9

R245

6
5

R392

68k

C301

0.1

R237

1k

R242

10k

10k

203-11

R204

R205

203-7

C207

SP,MY

JR201

0.1

203-10

100

100

1k

0

R213

R212

R206

MB91354APMT

-G-104-BNDE1

SYSTEM CONTROL

R202

47k

R203

47k

1k

1k

IC202

1k

R207

1k

R214

1k

R215

1k

R216

203-1

C209

X201

12.5MHz

0.1

R210

3.3k

R217

R208

10k

0

C204

C208

0.1

C205

0.1

0.1

C211

0.01

C213

0.01

C215

0.01

C216

0.01

C218

0.1

C225

0.01

SP,MY

R285

10k

R303
R307
R312

JR203

0

C226

0.1

C229

0.1

10k
10k
100k

R288

R391

100

R236

1k

R239

1k

R241

1k

R244

10k

R247

10k

R250

10k

R257

10k

R251

10k

R287

1k

R291

100

100

203-2

203-3

203-4

203-5

203-6

R393

10k

D302

1SS352-TPH3

D301

1SS352-TPH3

Q302

2SC2712

RESET

12
11
10

D303

1SS352-TPH3

R394

10k

C302

10

50V

C201

0.01

8
7
4
3
1

C268

12
11
10
9
8
7
6
5
4
3
2
1

*1 C274

100/16V
100/50V

47

25V

C274

C267

C203

0.1

IC201

S-80929CMMC-G8Z

RESET

CN202

6P

(FOR CHECK)

EP201

FB201

C297

0UH

CN201

0.1

17P

DISPLAY

BOARD

(Page 31)

SP,MY
AEP,UK

*1

47

25V

CN206

#SAN11P

POWER
BOARD

(Page 33)

STR-DB900

203-8

C238

*2 R315

2.2k

SP,MY

0

AEP,UK

0.1

0.022

C252

0.022

C253

R317

R315

1k

R388

100

SP,MY

C239

JR204

0.022

*2

R330

R338

R389

R316

10k

10k

10k

100

SP,MY

IC209

BR24L16F-WE2

EEPROM

0

C235

R318

10k

0.1

R326

C251

0.1

R328

C236

0.1

1k

R327

R320

1k

R321

10k

10k

1k

C242

220
10V

R324

R325

1k

1k

FB205

0

9
2

+3.3V
10V
BUS

5V
GND

CN209

DIGITAL

DIGITAL

BOARD

BOARD

(2/3)

(1/3)

(Page 17)

(Page 18)

DIGITAL

BOARD

(2/3)

(Page 18)

VIDEO

BOARD

(Page 29)

5P

1919

STR-DB900

4-8. PRINTED WIRING BOARD — DIGITAL BOARD (SIDE A) —

1

2

(SIDE A)DIGITAL BOARD

A

B

58

4

IC209

1

R216

R328

IC202

R212
R213

R215

R214

R207

45

R206

R324
R325

88

89

R291

C215

C213

C301

13

54

E

JR203

R241
R236

Q301

CN202

5

6

C216

R239

132

133 176

X201

1

2

C

C211

E

Q302

D

D303
R393

IC201

• See page 10 for Circuit Boards Location. :Uses unleaded solder.

3 4 5 6 7

C285

C286

R220

R229

R223

R224
R225

13

24

R379

R381

R221

R374

IC217

12

R222

Q202

E

Q201

C282

R371

1

3625

R368

48

37

R362

R364

R356

R359

E

R340

R348

R350

R351

R343

R349

916

R326

R318

44

1

R205

R204

R302

C231

R294

R256

R211

R327

R304

R246

R299

C224

R238

R309

R272

R282

R271

R270

R249

R243

IC205

13

C240

R240

R339

R331

R332

X202

FB206

R329

FB211

C247

FB204

C246

D202

R382

R387

R383

FB209

FB212

R385

R384

R390

C291

C292

X203

R253

23

R233

R219

R232

R230

R231

R337

R323

130

R298

120

IC206

R268

91

R267

R255

9061

R254
R258
R259
R260

R261

R234
R266

R252

R262

R263

C222

14

R264

R265

60

44

R277

8

R278

5

5

8

1

4

IC210

31

R313

R314

R306

C289

IC203

122

R284

R308

IC204

R311

C266

IC216

85

IC211

1 4

81

R367

R358

R344

8

• Semiconductor
Location

Ref. No.

D202 A-6
D303 D-1

IC201 D-1
IC202 C-2
IC203 C-6
IC204 D-5
IC205 D-4
IC206 C-5
IC209 B-3
IC210 D-4
IC211 C-7
IC216 C-7
IC217 B-7

Q201 D-7
Q202 D-7
Q301 D-2
Q302 C-1

Location

E

STR-DB900

(FOR CHECK)

11

1-862-295-

(11)

2020