Sony STSDB-900 Service manual

ST-SDB900

SERVICE MANUAL

Ver 1.0 2004.07

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

DAB tuner section

Frequency range 174.928 (5A) – 239.200 (13F) MHz

For details, see “DAB frequency table”

below.
Sensitivity –99 dBm
Signal-to-noise ratio 97 dB
THD+N 0.009% (1 kHz)
Channel separation 87 dB (1 kHz)
Selectivity 40 dB (at adjacent channel)
Frequency response +0.5/–0.5 dB (5 Hz – 20 kHz)
Digital output Optical

Sampling frequency:

48 kHz
Aerial terminal 75 Ω, F female
Analog output level 2 Vrms

FM tuner section

Frequency range 87.5 – 108.0 MHz (50 kHz step)
IHF Sensitivity 1.0 µV
Signal-to-noise ratio at 40 kHz deviation 70 dB (stereo)
THD+N 1 kHz, 40 kHz deviation 0.5% (stereo)
Channel separation 45 dB (1 kHz)
Selectivity at 400 kHz 60 dB
Frequency response +0.5/–2.0 dB (30 Hz – 15 kHz)
Aerial terminal 75 Ω, IEC male

AM tuner section

Frequency range 531 – 1,602 kHz (9 kHz step)
Sensitivity (with AM loop aerial)

330 µV/m

Signal-to-noise ratio 54 dB
THD+N 0.5% (400 Hz)
Selectivity at 9 kHz 35 dB
Aerial terminal Push lever

General

Power requirements 230 V AC, 50/60 Hz
Power consumption 12 W
Dimensions 430 x 85 x 300 mm (w/h/d)
Weight 4.5 kg
Remote control capabilityIR
Station preset capacity DAB maximum of 99

FM maximum of 30
AM maximum of 30

Supplied accessories

• Audio cord (1)

• AM loop aerial (1)

• FM wire aerial (1)

• DAB wire aerial (1)

• Remote commander (1)

• R6 (size AA) batteries (2)

Design and specifications are subject to change without notice.

9-879-012-01

2004G0278-1
© 2004.07

DAB/FM/AM TUNER

Sony Corporation

Home Audio Company
Published by Sony Engineering Corporation

ST-SDB900

DAB frequency table

Band-III (174 to 240 MHz)

Frequency Label Frequency Label

174.928MHz 5A 209.936MHz 10A

176.640MHz 5B 211.648MHz 10B

178.352MHz 5C 213.360MHz 10C

180.064MHz 5D 215.072MHz 10D

181.936MHz 6A 216.928MHz 11A

183.648MHz 6B 218.640MHz 11B

185.360MHz 6C 220.352MHz 11C

187.072MHz 6D 222.064MHz 11D

188.928MHz 7A 223.936MHz 12A

190.640MHz 7B 225.648MHz 12B

192.352MHz 7C 227.360MHz 12C

194.064MHz 7D 229.072MHz 12D

195.936MHz 8A 230.784MHz 13A

197.648MHz 8B 232.496MHz 13B

199.360MHz 8C 234.208MHz 13C

201.072MHz 8D 235.776MHz 13D

202.928MHz 9A 237.488MHz 13E

204.640MHz 9B 239.200MHz 13F

206.352MHz 9C

208.064MHz 9D

TABLE OF CONTENTS

1. GENERAL ................................................................... 3

2. TEST MODE ............................................................... 4

3. DIAGRAMS

3-1. Block Diagram ................................................................ 9

3-2. Printed Wiring Board – MAIN Board (Side A) –............ 10

3-3. Printed Wiring Board – MAIN Board (Side B) –............ 11

3-4. Schematic Diagram – MAIN Board (1/3) – .................... 12

3-5. Schematic Diagram – MAIN Board (2/3) – .................... 13

3-6. Schematic Diagram – MAIN Board (3/3) – .................... 14

3-7. Printed Wiring Board

– TRANS, AC SW, JOG, RM Board –............................ 15

3-8. Printed Wiring Board – DISPLAY Board – .................... 16

3-9. Schematic Diagram – DISPLAY Board – ....................... 17

4. EXPLODED VIEWS

4-1. Case, Front Panel Section................................................ 20

4-2. Chassis Section................................................................ 21

5. ELECTRICAL PARTS LIST .................................. 22

* This tuner does not support L-Band reception.

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 PARTS WHOSE P AR T NUM­BERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE­MENTS PUBLISHED BY SONY.

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.

2

SECTION 1

GENERAL

List of button locations and reference pages

Main unit

1 (remote sensor)
2 POWER switch
3 BAND
4 Display window
5 MENU
6 TUNING/SELECT
7 ENTER
8 MEMORY
9 DISPLAY
q; TUNING MODE

ST-SDB900

This section is extracted
from instruction manual.

1

2

q;

6534

89

7

3

ST-SDB900

SECTION 2

TEST MODE

1. Entering test mode

1. Turn OFF the power.

2. While pressing [DISPLAY] button and [MENU] button together, turn ON the [POWER] button.

3. When test mode starts “DIAG MENU” is displayed for a few seconds, then test mode starts.

[ FACTORY RESET ]

2. Leaving test mode

1. Turn OFF the power.

3. Selecting the test mode

When you enter test mode, if you turn the [TUNING/SELECT] JOG dial, this switches the display to the test menu.

FACTORY RESET

TUNING/SELECT

TUNING/SELECT

3-1. Restoring the factory settings

1. Enter test mode, then turn the [TUNING/SELECT] dial to display “FACTORY RESET”.

dial

FL/KEY TEST

dial

VERSION

Screen display

Restores the factory settings

Fluorescent lamp display and button test

Version display

[ FACTORY RESET ]

2. Press the [ENTER] button. The “Executing” display.

Screen display

[ FACTORY RESET ]

Executing

3. After 3-4 seconds, the “Executing” disappears. Factory Reset is completed.

Screen display

[Contents of factory settings]

• BAND ................. DAB

• DAB Module ................. Service List Clear

................. DRC Off

................. DAB preset all clear

• FM Mode ................. STEREO

• 30 FM Preset ................. All 87.50 MHz

• 30 AM Preset ................. All 531 kHz

• Preset Station Name........ All clear

• DIMMER Full (duty 100)

4

[ FACTORY RESET ]

ST-SDB900

3-2. FL/KEY TEST MODE

1. Enter test mode, then turn the [TUNING/SELECT] dial to display “FL/KEY TEST”.

Screen display

[ FL / KEY TEST ]

2. Press the [ENTER] button. The entire screen lights up.

Screen display

PTY

PTY

MEMORY

SECONDARYRDS TP STEREO

DAB
FM
AM

MONO

DUAL DRC

TUNED

AUTO

MANUALPRESET

3. Turning the [TUNING/SELECT] dial displays the dial check screen. When you turn the [TUNING/SELECT] dial left and right, the character
display moves left and right.

Screen display

TP

DAB
AM

MONO

DRC

TUNED

PRESET

Character display

4. To check operation of each button, press it and verify that the corresponding display goes out.

[BAND] button ................. “TP” display

[TUNING MODE] button..... “MONO” display

[DISPLAY] button .............. “DRC” display

[MENU] button ................. “TUNED” display

[ENTER] button ................. “PRESET” display

[MEMORY] button.............. “PTY” display

5. Press the [DAB] button on remote control after checking front panel button, “O” and “K” light up on a character display.

6. Turn OFF the power.

3-3. VERSION display

1. Enter test mode, then turn the [TUNING/SELECT] dial to display “VERSION”.

Screen display

[ VERSION ]

2. Press the [ENTER] button. The System Version is displayed.

Screen display

[ VERSION ]

sys v1.03 4415

Syscon Firmware
Version

3. Turn the [TUNING/SELECT] to the right to display the DAB version.

Screen display

Check sum

[ VERSION ]

dev v1.8 - 3

DAB Module Firmware Version

Turn the [TUNING/SELECT] dial to the left to display the System Version.

4. Press the [ENTER] button to return to test mode.

5

ST-SDB900

4. Temporary PRESET setting mode

This device is not adjusted but reception can be checked with the temporary Preset values.

1. Turn OFF the power.

2. While pressing [DISPLAY] button and [MEMORY] button together, turn ON [POWER] button.

3. When you enter temporary PRESET setting mode, the “MEMORY” display flashes. The only dif ference in this mode is the use of t he
temporary Preset values. Otherwise, operation is normal.

4. For the FM and AM band, the PRESET values are as follows.

FM band AM band

FM01 87.50 MHz AM01 531 kHz
FM02 88.00 MHz AM02 603 kHz
FM03 98.00 MHz AM03 999 kHz
FM04 100.00 MHz AM04 1404 kHz
FM05 106.00 MHz AM05 1602 kHz
FM06 108.00 MHz –

5. For the DAB band, there are no temporary Preset values.
Instead, the CH labels handle this with “MENU” - “DAB TUNE AID” as follows.

DAB band

5A (174.928 MHz)
5B (176.640 MHz)
8D (201.072 MHz)
12B (225.648 MHz)
13F (239.200 MHz)

6. End temporary PRESET mode with a Power OFF.

6

• Circuit Boards Location

AC SW board

RM board

ST-SDB900

SECTION 3

DIAGRAMS

TRANS board

MAIN board

DAB tuner module

DISPLAY board

tuner unit

JOG board

7

ST-SDB900

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

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

•Voltages are tak en with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.

•Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production
tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F : FM
g : ANALOG OUT
I : DIGITAL OUT

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.

•Waveforms
– MAIN Board –

1 IC300 wl SCKO

1.8432 MHz

2 IC300 is XO

16 MHz

4.5 Vp-p

2V AC/DIV

0.2

µ

sec/DIV

1 Vp-p

0.5V AC/DIV
50nsec/DIV

8

DAB

MODULE

AUDIO_LEFT_OUT

AUDIO_RIGHT_OUT

Q151,

D101-103

OR GATE

SPDIF

S1_IN

S1_DOUT

DAB_OUT

DAB_IN

AM

AC_STOP

86

EEPROM

IC301

IC401

MUTE
Q200

MUTE
Q250

L

R

J201

ANALOG

OUT

DAB

DIGITAL

OPTICAL OUT

59

FL-DATA

53

IC300

SYSTEM CONTROL

52

43

75

74

DAB_IO1

28

DAB_IO2

27

DAB_OUT

DAB_IN

FLASH1
AC_STOP

X_L_MUTING

85

RSTX

77

SDA

34

X0

82

X1

83

SCL

33

X301

16MHz

5
6

54

SIRCS

60

FL CLK

63

FL-CS1

62

FL-CS0

61

FL RST

IC800

FL DRIVER

DA

63

CP

62

CS

61

RESET

60

4

AD1

3

AD2

P36-70

P1-35

5

39

40
55

SEG1

SEG35

COM1

COM16

FLUORESCENT

INDICATOR

TUBE

NC

FL800

IC801

FL DRIVER

DA

63

CP

62

CS

61

RESET

60

4

AD1

3

AD2

539SEG1

SEG35

FF1

FF2

SIRCS

IC802

1

38

KEY_AD0

39

KEY_AD1

55

KEY3

FUNCTION

KEY

ROTARY

ENCORDER

RV801

S831-833

D201

AC
IN

S901

POWER

-30V REG
Q912

IC907

+5V
REG

5

4

FL -30V

D922-924

Q909

5

4

AC DETECT

IC912

D918

AU -6V

RECT

D901-904

IC901

+10V

REG

1

3

D919

FM+3.3V
D+3.3V

IC903

-6V

REG

2

3

RECT
D911

T901

AU +6V

FM +10V

T902

MUTE +3.3V

POWER

CONTROL

Q910,911

30

DAB_PWR

48

AC_STOP

: DIGITAL OUT

: FM

• Signal path

: ANALOG OUT

GATE

IC403

P36

P71

P72

G1-16

66

JOG_P

67

JOG_M

S841-843

RECT

D914-916

Q910

FMAM +3.3V

DAB +5V

POWER

CONTROL
Q906,908

31

DAB_PWR5

IC910

+3.3V

REG

2

3

D913

IC911

+3.3V

REG

1

2

1

Q202

BUFFER

IC200

Q201

4

DABSEL

4

12

13

3
5

11

9

LPF

IC202

AMP

IC203

FM

COAXIAL

75Ω

FM/AM
TUNER

ANTENA

LCH

RCH

CE

TUNED
STEREO
MUTING

FM_S-METER

RDS_INT

RDS_DATA

SLATCH

TUNED

STEREO

TU_MUTING

S-METER
RDS_INT

RDS_DATA

DAB

COAXIAL

75Ω

ANTENA

CL

DO

DI

TUN_CLK

TUN_DIO2

TUN_DIO1

73

78

14

76

15

SLATCH
TUNED
STEREO
TU_MUTING
S-METER
RDS_INT

RDS_DATA

TUN_CLK
TUN_DIO2
TUN_DIO1

SLATCH
TUNED
STEREO
TU_MUTING
FM_SIG_OUT
RDS_INT
RDS_DATA

TUN_CLK
TUN_DIO2
TUN_DIO1

D +3.3V

IC100

RESET

2

1

1
2
3
6

7
8

FLASH2
RESET
MD0
MD2

51

49

MD0
MD2

FLASH2
FLASH1

FLASH1

FLASH2

WP

32

7

SDA
SCL

WP

X1

83

X302

1.8432MHz

2

POWER

TRNSFORMER

IC902

+6V

REG

1

3

14

IC201

SELECTOR

DIGITAL

TRNSMITTER

CN306

FLASH

PROGRAM

TUNING/
SELECT

REMOTE
SENSOR

D930

3-1. BLOCK DIAGRAM

ST-SDB900

ST-SDB900

99