Sony STR-DE225, STR-DE325 Schematic

STR-DE225/DE325

MICROFILM

SERVICE MANUAL

Photo : STR-DE225

Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY”, “PRO LOGIC” and the double-D symbol are
trademarks of Dolby Laboratories Licensing Corporation.

SPECIFICA TIONS

Amplifier section

Power output

Stereo mode (DIN 1 kHz, 4 ohms)

STR-DE325: 90 W + 90 W

STR-DE225: 40 W + 40 W
Surround (DIN 1 kHz, 4 ohms)
mode Front: STR-DE325: 90W/ch

STR-DE225: 40W/ch

Centre: STR-DE325: 90W

STR-DE225: 40W

(only in PRO LOG IC MODE)

REAR: STR-DE325:

(DIN 1 kHz, 4ohms) 90 W

STR-DE225: (DIN 1 kHz,

4ohms) 40 W

5.1/DVD Front: 90 W/ch
INPUT * mode (DIN 1 kHz, 4 ohms)

Centre: 90 W

(DIN 1 kHz, 4 ohms)

Rear: 45 W/ch

(DIN 1 kHz, 8 ohms)

(except STR-DE225)
Frequency PHONO: RIAA(except STR-DE225)
response equalization curve ±0.5 dB

TV / LD, CD, TAPE / MD,

VIDEO, 5.1/DVD INPUT*:

10Hz - 50kHz ±1dB

Input

Sensitivity Impedance S/N

PHONO 50 74 dB
(STR-DE325) 2.5mV kilohms 72 dB**
(MM) (A, 2.5 mV)

CD,

5.1/DVD 200 mV
INPUT*

TAPE/MD,
TV/LD,
VIDEO

Outputs TAPE/MD REC OUT:

VIDEO AUDIO OUT:

WOOFER/MIX AUDIO

PHONES: Accepts low and high

50 82 dB

kilohms 82 dB**

Voltage: 150 mV,
Impedance: 10 kilohms

Voltage: 150 mV,
Impedance: 10 kilohms

OUT: V oltage: 2V
Impedance: 10 kilohms

impedance headphones

(Weighting
network,
input level)

**’78IHF

AEP Model

Canadian Model

STR-DE225/DE325

US Model

E Model

Australian Model

Chinese Model

STR-DE325

UK Model

STR-DE225

FM tuner section

Tuning range 87.5 – 108.0 MHz
Aerial terminals 75 ohms, unbalanced
Sensitivity Mono: 18.3 dBf, 2.2µV /75 ohms

Usable sensitivity 11.2 dBf, 1V /75 ohms (IHF)
S/N Mono: 76 dB

Harmonic Mono: 0.3 %
distortion at Stereo: 0.5 %

1 kHz
Separation 45dB at 1 kHz

Frequency 30 Hz – 15kHz
response

Selectivity 60 dB at 400 kHz

AM tuner section

Tuning range 531 – 1602 kHz
Aerial Loop aerial
Usable sensitivity 50 dB/m (at 999 kHz)
S/N 54 dB(at 50 mV/m)
Harmonic 0.5%(50 mV/m, 400Hz)
distortion
Selectivity 35 dB

Stereo: 38.3 dBf, 22.5µV /75
ohms

Stereo: 70dB

+0.5

dB

–2

Muting Full mute
BASS BOOST +10dB at 70 Hz
TONE ±8dB at 100 Hz and 10 kHz

FM STEREO/FM-AM RECEIVER

— Continued on next page —

General

System Tuner section; PLL quartz-locked

Power 230 V AC, 50/60 Hz
requirements

Power STR-DE325: 195 W
consumption

AC outlets Switched 100 W
Dimensions 430 × 145 × 295 mm

Mass(Approx.) STR-DE325: 7.4 kg

Supplied FM wire aerial (1)
accessories AM loop aerial (1)

Design and specifications are subject to change without notice.
Specifications indicated are measured at 230 VAC, 50 Hz

digital synthesizer system

Preamplifier section:

Low-noise NF type epualizer

Power amplifier section:

Pure-complimentary SEPP

STR-DE225: 110 W

(except for the U.K. model)

STR-DE225: 6.1 kg

Remote controller (remote) (1)
Size AA (R6) batteries (2)
Scart adaptor (1)

TABLE OF CONTENTS

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

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

3. DIAGRAMS

3-1. Circuit Boards Location ····················································· 5
3-2. Block Diagram ··································································· 7
3-3. Schematic Diagram — Display Section — ························ 9
3-4. Printed Wiring Boards — Display Section —·················· 11
3-5. Schematic Diagram — Power Section — ························ 13
3-6. Printed Wiring Boards — Power Section —···················· 15
3-7. Printed Wiring Boards — Main Section —······················ 17
3-8. Schematic Diagram — Main Section (1/3) — ················· 19
3-9. Schematic Diagram — Main Section (2/3) — ················· 21
3-10. Schematic Diagram — Main Section (3/3) — ················· 23
3-11. IC Pin Function Description ············································· 25
3-12. IC Block Diagrams ··························································· 27

4. EXPLODED VIEWS

4-1. Front Panel Section ·························································· 29
4-2. Chassis Section ································································· 30

SAFETY CHECK-OUT

After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leaka ge. Check leakage as
described below.

LEAKAGE

The AC leaka ge from an y exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT -540A. F ollow the man ufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated A C voltmeter . The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63T rd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

T o Exposed Metal

Parts on Set

AC

0.15

µ

F

Fig. A. Using an A C v oltmeter to check A C leakage.

1.5 k

Ω

Earth Ground

Voltmeter
(0.75 V)

5. ELECTRICAL PARTS LIST································ 31

SAFETY-RELATED COMPONENT WARNING!!

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

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE ! SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

— 2 —

LOCATION AND FUNCTION OF CONTROLS

[FRONT PANEL]

SECTION 1

GENERAL

3

@£

@™

@¡

4

@º

2

1

#™

#¡

@¢

@§

#º

@•

@∞

@ª

@¶

1 POWER switch (I/u)
2 CENTER LEVEL +, – buttons
3 REAR LEVEL +, – buttons
4 PRO LOGIC, C.STUDIO, HALL indicators
5 BASS BOOST indicator
6 MASTER VOLUME control
7 BALANCE control
8 TREBLE control
9 BASS control
!º MUTING button/indicator
!¡ SURROUND ON/OFF button
!™ BASS BOOST button
!£ SURROUND EFFECT/DELAY, MODE buttons
!¢ SET UP button
!∞ TAPE/MD FUNCTION button
!§ TUNER FUNCTION button

!•

!∞

!ª

!¶

Photo : STR-DE225

!¢

!§

!¶ CD FUNCTION button
!• VIDEO FUNCTION button
!ª TV/LD FUNCTION button
@º Numeric buttons
@¡ SHIFT button
@™ DIRECT TUNING button
@£ CHARACTER, DISPLAY buttons
@¢ MEMORY button
@∞ FM/AM button
@§ PRESET/CHARACTER +, – buttons
@¶ FM MODE button
@• SLEEP button
@ª TUNING/PTY SELECT +, – buttons
#º RDS PTY, EON buttons
#¡ PHONES jack
#™ SPEAKERS A, B ON/OFF buttons

!£

!™

5

!¡

!º

6

89

7

[REAR PANEL]

1 ANTENNA (FM/AM)
2 y SIGNAL GND
3 MIX AUDIO OUT
4 AC OUTLET
5 AC power cord
6 FRONT SPEAKERS (A/B)

1

2

3

9!º!¡!™

78

Photo : STR-DE225

4

6

7 SURROUND SPEAKERS (CENTER)
8 SURROUND SPEAKERS (REAR)
9 VIDEO AUDIO IN, AUDIO OUT
0 TV/LD AUDIO IN
!¡ TAPE/MD IN, REC OUT
!™ CD IN

5

— 3 —

SECTION 2

TEST MODE

INITIALIZATION MODE

* All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon completion
of repair.
* Procedure:
While depressing the VIDEO and the TAPE/MD buttons
simultaneously, press the power [I/u] button to turn on the main
power. T he message INITIAL appears and initialization is
performed.

FLUORESCENT INDICATOR TUBE TEST MODE

* All fluorescent segments are tested. When this test is activated,
all segments turn on at the same time, then each segment turns on
one after another.
* Procedure:
While depressing the TV/LD and the BASS BOOST buttons
simultaneously, press the power [I/u] button to turn on the main
power. All segments turn on at the same time, then each segment
turns on one after another. The messa ge FINISH appears when this
test is complete.

AUTO-BETICAL CHECK MODE

* T o auto-scanning and memorise of RDS station. (RDS model only).
* Procedure:
While depressing the MEMORY button, press the power [I/u]
button to turn on the main power . The message A UTO BET a ppears
and each function is selected one after another.

AM CHANNEL STEP 9 kHz/10 kHz
SELECTION MODE

* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step. (for US, CND and E models only)
* Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button, press the pow er [I/u] button
to turn on the main power. Either the message 9k STEP or 10k
STEP appears. Select the desired step.

REAR SPEAKER GAIN UP MODE

* The rear speaker gain can be set to either NORMAL or GAIN UP.
* Procedure:
While depressing the -SURR OUND- MODE button, press the power
[I/u] button to turn on the main power. Either the message
NORMAL or GAIN UP appears. When the product enters this
mode again, the other gain appears. Select the desired gain.

SOFTWARE VERSION DISPLAY MODE

* The software version is displayed.
* Procedure:
While depressing the TUNER and the BASS BOOST buttons
simultaneously, press the power [I/u] button to turn on the main
power. The software version is displayed.

— 4 —

3-1. CIRCUIT BOARDS LOCATION

SECTION 3 DIAGRAMS

DISPLAY board

SP-SW board

SP-SW-A board

PRIMARY board

SP-SW-B board

SECONDARY board

STAND BY board

MIX-OUT board

MAIN board

10 KEY board

VOLUME board

VR-TONE board

— 5 —

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

For schematic diagrams.
Note:

• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.

• All resistors are in Ω and 1/
specified.

• % : indicates tolerance.

• ¢ : internal component.

• 2 : nonflammable resistor.

• 1 : fusible resistor.

• C : panel designation.

W or less unless otherwise

4

For printed wiring boards.
Note:

• X : parts extracted from the component side.

• ® : Through hole.

• ¢ : internal component.

• b : Pattern from the side which enables seeing.

• Wavef orm

Note:

The components identified by
mark ! or dotted line with mark
! are critical for safety.
Replace only with part number
specified.

• U : B+ Line.

• V : B– Line.

• H : adjustment for repair.

• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
No mark : FM

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

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.
F : FM

• Abbreviation
CND : Canadian
EE : East European
AUS : Australian
CH : Chinese
G : German
MY : Malaysia
SP : Singapore
EA : Saudi Arabia

Note:

Les composants identifiés par
une marque ! sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce portant le numéro spécifié.

1 IC300 32PIN (OSC)

8MHz

5.2Vp-p

2 IC201 34PIN (X1)

4.19MHz

4.4Vp-p

— 6 —

3-2. BLOCK DIAGRAM

STR-DE225/DE325

EXCEPT AEP, UK, G,
EE MODEL

CD

TAPE

J402

IN

TAPE

OUT

TV/LD

VIDEO

J403

IN

VIDEO

OUT

• RCH is omitted

• Signal Path

FM ANT

(75Ω)

AM ANT

AEP, UK, G, EE MODEL

PHONO

J401

CD

TAPE

IN

TAPE

J402

OUT

TV/LD

VIDEO

IN

J403

VIDEO

OUT

: FM

: PHONO

: CD (ANALOG)

AM R OUT

SIGNAL

SIG

L

R

L

R

L

R

L

R

L

R

L

R

L

R

TUNER BLOCK

TUNED

STEREO

T MUITE

DO

AUTO STOP

STEREO

T MUTE

DO

R CH

R CH

R CH

R CH

R CH

R CH

R CH

SIG
AUTO STOP
STEREO
T MUTE
DO

DET OUT

DATA

SDATA

L OUTFM

CLK

CE

SCLK

SLAT

EQ AMP

IC402

AEP, UK, G, EE MODEL

4

25

SIGNAL

18

AUTO STOP

19

STEREO

40

T MUTE

11

PLL DATA

16

R CH

X1

4.33MHz

13 14

RDS
IC1

4.198MHz

2

16

45

46

RDS CLK

RDS DATA

X134X2

35

X201

LED +5V

HALL39SIMULATED

D235 D236 D237 D238

AUDIO SELECTOR

IC401

28
30
29
24
25
26
22
21

CL15DI14CE

13

S DATA

S CLK

SLAT

LED SW

Q231

38

C

STUDIO

27

23

X301
8MHz

20

LED +5V

D239

BASS

BOOST

PROLOGIC37MUTING

43

MUTINGHALL PROLOGIC

SURROUND

PROCESSOR

45

LT IN

31

32

DATA

35 37

S DATA

S DATA

10

S DATA

IC300

DATA

S CLK

9

S CLK

S240

34 38CE30

S CLK

S LAT

12

L OUT

24

C OUT

9

S OUT

22

CLK

CLK

13

S CE

S CE

SYSTEM CONTROL

FUNCTION

KEY

S217-239
S241,242

IC201

A/D 227A/D 128A/D 3

26

BASS

TREBLE

RV422

RV421

MUTE
Q303

SURROUND

AMP

IC302

(1/2)

IC302

(1/2)

54

53

LOW BASS

MUTE FUNC

SYS POWER

44 77 72

S200

SYSTEM
POWER

MUTE
Q307

MUTE
Q308

BALANCE

Q401,452

DBFB

CONTROL

KI 160KI 2

FUNCTION

KEY

S201-216

RV423

AMP

IC404

UP

8 7
MOTOR

DRIVER

IC202

3 2

41UP42

VERSION

56

59

UP

DOWN

DOWN

D221-223

VOLUME

RV404

M

16

DOWN

S1 15 G1 10

S8-15

INDICATOR TUBE

+B

-B

+B

-B

21

SP RY

PROTECT

.

70 62

FL201

FLOURESCENT

13 VCC
14
15

6

8 IN 2

13 VCC
14
15

8

22

SURR RY

71

POWER AMP

IC701

VCC

+VE 1

VEE

IN 1

-VE 1

+VE 2

-VE 2

POWER AMP

IC702

VCCIN+VE
VEE

.

80 78

2

3

12

11

2

3

-VE

BRIDGE

POWER RY

STOP

RESET

SIRCS

15

23
47

17

49

BIAS

Q701,Q702

BIAS

Q651,Q652

BIAS

Q601,Q602

IC203

REMOTE
CONTROL
RECEIVER

LED +5V

IC201 +B

TUNER/RDS +5V

+5.6V

-24V

+12V

+9V

-12V

21

+B

-B

POWER

AMP
Q703

POWER

AMP
Q704

POWER

AMP
Q653

POWER

AMP
Q654

POWER

AMP
Q603

POWER

AMP
Q604

RESET

Q201,202

D202

D201

D901

+9V REG

Q808

L401

CURRENT

DET

Q720

CURRENT

DET

Q670

CURRENT

DET

Q620

D203

-24V REG
Q801

IC801

IC802

STANDBY

IC950

3

DELAY
+B SW

Q951

PROTECTOR

Q721-723

D724

+12V

13

REG

-12V

23

REG

6

D723

D725

D802

D820-823

RELAY
DRIVE

Q809

EXCEPT
CND MODEL

D810-813

58

RELAY
DRIVE

Q710

RELAY
DRIVE

Q610

RY851

RY852

RY801

RY801

RELAY
DRIVE

Q802

US, CND, E,
EA MODEL

EXCEPT E, EA,
CH MODEL

RY701

RY601

T902

S701

SPEAKER B

SPEAKER A

CND MODEL

F1

F2

RY901

ON

OFF

ON

OFF

T901

F901

AEP, G, EE, SP,
MY, AUS,CH MODEL

F902

CNJ902

CNJ902

R CH

R CH

BA

L

R

C

S(L)

S(R)

E, EA MODEL

AC

IN

J741

PHONS

R CH

R CH

SURROUND

J253

WOOFER

S901

TM701

FRONT

SPEAKER

TM601

SPEAKER

F1

F2

— 7 — — 8 —

STR-DE225/DE325

3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION —

— 9 — — 10 —

3-4. PRINTED WIRING BOARDS — DISPLAY SECTION —

STR-DE225/DE325

12

DISPLAY BOARD

A

1

B

9

7

C

D

E

B

1

(BASS BOOST)

VR-TONE BOARD

34567891011121314

DE225:CND

B

B

E

MAIN BOARD

B

E

TO

CNS204

RD1

RD2

RD3

RD4

RD5

RD6

RD7

RD8

RD9

RD10

RD11

RD12

RD13

RD14

RD15

RD16

RD17

RD18

RD19

RD20

RD21

RD22

1142 5 14 17 31 34 35

FL201

1

80

IC201

24
25

40

41

65

64

DE325:E,EA,CH
AUS,SP,MY MODEL

DE225:AEP,G,EE,UK
DE325:AEP,G,EE,AUS
MODEL

(Page 17)

DE325:EXCEPT AEP,G,EE
MODEL

RD23

RD24

RD25

DE325:
EE,SP,MY
MODEL

DE225:
AEP,G,EE,UK
MODEL

DE225:AEP,G,EE,UK
DE325:AEP,G,EE
MODEL

1

3

(PRO LOGIC)

(C.STUDIO)

(HALL)

DE225:AEP,G,EE,UK
DE325:AEP,G,EE
MODEL

DISPLAY EON PTY

+

MEMORY

+

CENTER

LEVEL

+

REAR

LEVEL

CHARACTER

PRESET

CHARACTER

_

FM/AM FM MODE SLEEP

+

PTY SELECT

_

_

RDS

TUNING

1/

_

E

F

G

VOLUME BOARD

H

I

16

J

1

E

B

TO

MAIN BOARD

G

CNS701

BASS

MUTING

7

B

E

58

(Page 18)

11

(11)

TREBLE

BALANCE

1-669-265-

1-669-262-

11

(11)

10 KEY BOARD

4

1

RV404

MASTER
VOLUME

SURROUND

ON/OFF

M

14

1-669-264-

11

TO

MAIN BOARD

A

CNS301

(Page 17)

BASS BOOST

MODE

SURROUND

EFFECT/DELAY

SET UP

TAPE/MD

PHONO TUNER TUNER

(11)

DE325:AEP
G,EE
MODEL

TV/LD VIDEO

CDCD

DE325:AEP,G,EE
MODEL

0 9 8 7

• Semiconductor Location

Ref. No. Location

D201 B-3
D202 B-2
D203 B-3
D204 B-3
D211 A-9
D212 A-9
D213 B-9
D214 B-9
D215 B-9
D216 B-9
D217 B-9
D218 B-9

Ref. No. Location

D221 B-8
D222 B-8
D223 B-8
D225 B-8
D231 B-2
D235 C-11
D236 B-11
D237 B-11
D239 C-2
D238 F-2
D421 I-1

2345 1

DIRECT TUNING

6

1-669-293-

Ref. No. Location

IC201 C-6
IC202 B-1
IC203 C-10
IC404 I-3

Q201 B-3
Q202 B-4
Q231 B-2
Q401 H-3
Q402 I-2
Q451 I-2
Q452 H-2

SHIFT

11

(11)

— 11 — — 12 —

STR-DE225/DE325

3-5. SCHEMATIC DIAGRAM — POWER SECTION —

— 13 — — 14 —