SONY 21RD1 Service Manual

STR-DE725

SERVICE MANUAL

Manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY” the double-D symbol a “AC-3” and “PRO LOGIC” are trademarks of Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

AUDIO POWER SPECIFICATIONS

POWER OUTPUT AND TOTAL HARMONIC DISTORTION: With 8 ohm loads, both channels driven, from 20 - 20,000 Hz; rated 100 watts per channel minimum RMS power, with no more than

0.09% total harmonic distortion from 250 milliwatts to rated output .

Amplifier section

POWER OUTPUT Stereo mode

Surround mode

a)Depending on the sound field settings and the source, there may be no

sound output.

Dynamic power output

Harmonic distortion at rated output

Frequency response

(8 ohms 20 Hz –20 kHz, THD 0.09%) 100 W + 100 W (8 ohms at 1 kHz, THD 0.8%) Front: 100 W/ch Centera): 100 W Reara): 100 W/ch

155 W + 155 W, 8 ohms 220 W + 220 W, 4 ohms

Less than 0.09% (with sound field, tone, and bass booster bypassed)

PHONO: RIAA

equalization curve

±0.5 dB CD, T APE, MD/DAT, TAPE/MD, DVD/LD, TV/DBS, VIDEO 1 and VIDEO 2 :

10 Hz - 50 kHz +0.5/–2 dB (with sound field, tone,

and bass booster bypassed)

Inputs (Analog)

VIDEO 1 and VIDEO 2 :

b)78’ IHF c)W eighted network, input level

Inputs (Digital)

Outputs

BASS BOOST

US Model

PHONO:

Sensitivity: 2.5 mV Impedance: 50 kilohms S/Nb): 75 dB (A, 2.5 mVc))

CD, DVD/LD, TAPE, MD/DAT, TAPE/MD, TV/DBS,

Sensitivity: 150 mV Impedance: 50 kilohms S/Nb): 82 dB (A, 150 mVc))

DVD/LD:

Sensitivity: – Impedance: –

S/N: 100 dB (A, 20 kHz LPF) TAPE/MD, (REC OUT); VIDEO 1, 2 (AUDIO OUT):

Voltage: 150 mV

Impedance: 10 kilohms WOOFER:

Voltage: 2 V

Impedance: 1 kilohms PHONES:

Accepts low - and high-impedance headphones +6 dB at 70 Hz

— Continued on next page —

MICROFILM

FM STEREO FM-AM RECORDER

Sampling Frequency EQ

48 kHz BASS:

MID:

TREBLE:

Gain levels:

100 Hz ~ 1.0 kHz (21 steps)

500 Hz ~ 5.0 kHz (21 steps)

1.0 kHz ~ 10 kHz (21 steps)

±10 dB, 1 dB step

Harmonic distortion Selectivity

d)You can change the AM tuning scale to 9 kHz. After tuning in any AM

station, turn off the receiver. Hold down the TUNING + button and press the 1/u button. All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz, repeat the procedure.

0.5% (50 mV/m, 400 kHz) At 9 kHz: 35 dB At 10 kHz: 40 dB

FM tuner section

Tuning range

87.5 - 108.0 MHz

Antenna terminals Sensitivity

75 ohms, unbalanced Mono: 18.3 dBf, 4.5 µV Stereo: 38.3 dBf, 45 µV

Usable sensitivity S/N

11.2 dBf, 2 µV (IHF) Mono: 76 dB Stereo: 70 dB

Harmonic distortion at 1 kHz

Mono: 0.3 %

Separation

Stereo: 0.5 % 45 dB at 1 kHz

Frequency response Selectivity

AM tuner section

Tuning range

Antenna

30 Hz - 15 kHz +0.5/-2 dB 60 dB at 400 kHz

With 10-kHz tuning scale:

530 - 1710 kHz

With 9-kHz tuning scale:

531 - 1710 kHz

Loop antenna

Usable sensitivity S/N

50 dB/m (at 1,000 kHz or 999 kHz) 54 dB (at 50 mV/m)

Video section

Input Outputs

General

System

1 Vp-p 75 ohms 1 Vp-p 75 ohms

Tuner section:

PLL quartz-locked digital synthesizer system

Preamplifier section:

Low- noise NF type equalizer

Power amplifier section:

Pure-complementary SEPP

Power requirements Power consumption

120 V AC, 60 Hz

AC outlets Dimensions

d)

Mass (Approx.) Supplied accessories

Design and specifications are subject to change without notice.

290 W 2 switched, total 100 W 430 × 355 × 157.5 mm (17 × 14 × 61/4 in.) including projecting parts and controls

10.5 kg (23 lb 3 oz)

• FM wire antenna (1)

• AM loop antenna (1)

• Remote commander RM-PP401 (remote) (1)

• Carbon-ZINC dry batteries (2)

— 2 —

SAFETY CHECK-OUT

TABLE OF CONTENTS

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 leakage. Check leakage as described below.

LEAKAGE

The AC leakage from any 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. Follow the manufacturers’ 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 AC voltmeter . The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd 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)

To Exposed Metal Parts on Set

1. GENERAL ······································································ 4

2. TEST MODE····························································6

3. DIAGRAMS

3-1. Circuit Boards Location ····················································· 7 3-2. Block Diagram — Main Section — ··································· 9 3-3. Block Diagram — Power Section — ······························· 11 3-4. Printed Wiring Board — AMP Section — ······················· 13 3-5. Schematic Diagram — AMP Section — ·························· 15 3-6. Printed Wiring Board — Video Section — ······················ 17 3-7. Schematic Diagram — Video Section — ························· 19 3-8. Printed Wiring Board —AUDIO Section —···················· 21 3-9. Schematic Diagram — AUDIO Section —······················ 23 3-10. Printed Wiring Board — Input Section — ······················· 25 3-11. Schematic Diagram — Input Section — ·························· 27 3-12. Printed Wiring Board — Display Section — ··················· 29 3-13. Schematic Diagram — Display Section — ······················ 31 3-14. Printed Wiring Board — SPEAKER Section —·············· 33 3-15. Schematic Diagram — SPEAKER Section —················· 35 3-16. Printed Wiring Board — Power Section — ····················· 37 3-17. Schematic Diagram — Power Section — ························ 39 3-18. Printed Wiring Board

— DIGITAL (SIDE A) Section —··································· 41

3-19. Printed Wiring Board

— DIGITAL (SIDE B) Section — ··································· 43 3-20. Schematic Diagram — DIGITAL Section (1/3) —·········· 45 3-21. Schematic Diagram — DIGITAL Section (2/3) —·········· 47 3-22. Schematic Diagram — DIGITAL Section (3/3) —·········· 49 3-23. IC Pin Function Description ············································ 51 3-24. IC Block Diagrams ··························································· 61

AC

0.15

µ

F 1.5k

Ω

voltmeter (0.75V)

Earth Ground

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

SAFETY-RELATED COMPONENT WARNING!!

4. EXPLODED VIEWS

4-1. Front Panel Section ·························································· 64 4-2. Chassis Section································································· 65

5. ELECTRICAL PARTS LIST ··································· 66

COMPONENTS IDENTIFIED BY MARK ! OR DOTTED 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 .

— 3 —

LOCATION AND FUNCTION OF CONTROLS

[FRONT PANEL]

SECTION 1

GENERAL

#§

#∞ #¢

#£ #™

#¡

1

#º

@ª

2

@•

@§¿

@¶

3

4

@¢@∞

1 1/u (POWER) button 2 MULTI CURSOR CONTROL 3 SURROUND, EQUALIZER, INDEX indicators 4 DIRECT TUNING button 5 VIDEO 1 button 6 MULTI CHANNEL DECODING indicator 7 TV/DBS button 8 SOUND FIELD GENRE button 9 SOUND FIELD MODE button 0 SOUND FIELD, EQ, BASS BOOST indicators !¡ MASTER VOLUME control !™ BALANCE control !£ MUTING button !¢ SOUND FIELD ON/OFF button !∞ BASS BOOST button !§ EQ ON/OFF button !¶ INPUT MODE button !• PHONO button !ª DVD/LD

67 890

5

@¡

@£

@™

@º

!•

!ª

@º TUNER button @¡ CD button @™ VIDEO 2 button @£ TAPE/MD button @¢ Numeric buttons @∞ SHIFT button @§ DISPLAY button @¶ MEMORY button @• FM/AM button @ª FM MODE button #º SLEEP button #¡ PHONES jack #™ TUNING +, – buttons #£ SPEAKERS A, B switche #¢ PRESET TUNING +, – buttons #∞ SET UP button #§ CURSOR MODE button

!¶

!¡

!™

!§

!£!¢!∞

— 4 —

[REAR PANEL]

234567 8

1

@º

!ª !•

1 DIGITAL 2 ANTENNA (FM/AM) 3 TV/LD 4 DVD/LD 5 VIDEO 2 6 VIDEO 1 7 MONITOR 8 S-LINK 9 WOOFER 0 SPEAKERS (REAR) !¡ SPEAKER (CENTER)

!¶

9

0!¡!™

!§

!£

!™ WIRELESS REAR SPEAKER !£ IMPEDANCE SELECTOR !¢ AC power cord !∞ AC OUTLET !§ FRONT SPEAKERS (A/B) !¶ SPEAKERS (FRONT) !• CD !ª PHONO @º y SIGNAL GND

!¢

!∞

— 5 —

SECTION 2

TEST MODE

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 SET UP and the SOUND FIELD MODE buttons simultaneously, press the power 1/u button to turn on the main power. All segments turn on at the same time, then each segment turns on one after another.

FACTORY SET MODE

* All preset contents are reset to the default setting. * Procedure:

While depressing the SET UP and the SOUND FIELD ON/OFF buttons simultaneously, press the power 1/u button to turn on the main power. The message FACTORY SET appears and the present contents are reset to the default values.

ALL CLEAR 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 DISPLAY and the SOUND FIELD ON/ OFF buttons simultaneously, press the power 1/u button to turn on the main power. The machine enters the DEMO mode.DEMO mode: Wait a while, then the demonstration starts. If the power 1/u button is pressed often the demonstration has started, the power is turned off, and the demonstration resumes if the power 1/u button is pressed again. ALL CLEAR mode; If the power 1/u button is pressed often the machine enters the DEMO mode, but before the demonstration starts, the display is turned off. Press 1/u again. No response is returned. Then press 1/u again. The preset data is cleared and the machine enters the normal power-on state.

SOUND FIELD CLEAR MODE

* The preset sound field is cleared when this mode is activated.

Use this mode before returning the product to clients upon completion of repair.

* Procedure:

While depressing the SOUND FIELD ON/OFF button, press the power 1/u button to turn on the main power. The message SURR CLEAR! appears and initialization is performed.

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.

* Procedure:

Set the FUNCTION to AM. Turn off the main power. While depressing the TUNING+ button or the PRESET TUNING + button, press the power 1/u button to turn on the main power. Either the message AM 9kHz STEP or AM 10kHz STEP appears. Select the desired step.

DSP TEST MODE

* Procedure:

While depressing the SET UP and the SOUND FIELD GENRE buttons simultaneously, press the power 1/u button to turn on the main power. The message DSP NO ERROR or DSP ERROR.

— 6 —

SECTION 3

d

DIAGRAMS

STR-DE725

3-1. CIRCUIT BOARDS LOCATION

DISPLAY board

SP SW board

H.P board

LED board

SW board

AC board

L.B board

REG board

SP board

VOLUME board

BALANCE board

AMPLIFIER board

REAR AMP board

INPUT board

JOINT board

VIDEO board

TUNER board

D.IN/OUT boar

DIGITAL board

AUDIO board

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.

• 2 : nonflammable resistor.

• 1 : fusible resistor.

• C : panel designation.

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 V OM (Input impedance 10 MΩ). Voltage v ariations may be noted due to normal production tolerances.

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

F : FM J : CD c : DIGITAL I : PHONO

W or less unless otherwise

4

For printed wiring boards. Note:

• X : parts extracted from the component side.

• ® : Through hole.

• b : Pattern from the side which enables seeing.

• Waveform

1 IC1201 (™ (XO)

4.0Vp-p

4MHz

2 IC1101 @¶ (X OUT)

5.5Vp-p

24.576MHz

3 IC1101 @ª (CLK OUT)

5.4Vp-p

12.288MHz

4 IC102 *™ (XO)

3.0Vp-p

4.0MHz

— 7 — — 8 —

STR-DE725

3-2. BLOCK DIAGRAM – MAIN SECTION –

MD/DAT

TAPE

VIDEO 3

MONITOR

TV/DBS

DVD/LD

VIDEO 1

VIDEO 2

PHONO

INPUT

VIDEO

DVD/LD

OUTPUT

INPUT

OUTPUT

INPUT

OUTPUT

INPUT

FM

75Ω

AM

L

LCD

LINPUT

LOUTPUT

L

LOUTPUT

LAUDIO

TM301

ANTENNA

J301

J302

J303

IC001

IR LINK

DET

J299

J201

J202

J203

TUNER UNIT

FM

AM

DO

TUNED

4 14 15 13 2 3 1

DO

TUNED

7 1

13

15

9

11

3

5

16

TMUTE

STEREO

S DATA

TMUTE

STEREO

VIDEO SELECT

IC201

V3 IN

VCC

M OUT

VEE

V1 IN

V1 OUT

V2 IN

V2 OUT

SW1

SW2

TV

SW3

LD

SW4

L OUT

10

R OUT

12

R CHR CH

DATA

CLK

CE

S CLK

S LAT

EQ AMP

IC302

31

15

5

SELECT

SWITCH

12

IC1005

11

3

A

10

2

B

1

9

C

16

IC202

-5V

3 2

8

REG

14

10

4

6

AUDIO SELECT

IC301

3

2

1

7 6 5

10

9

CONTROL

14

S DATA

IC1006

A B

C

+5V

-15V

DO

TUNED

STEREO

60

61

62

DATA

81

V-A

AUTO STOP

V-B82

83

V-E

80

V INH

CE

CLK15DI

13

S LAT

S CLK

TMUTE

97

STEREO

TUNER MUTE

4

DVD/LD

VIDEO2

8

11

A

S LAT

S CLK

S DATA

57

58

56

111A110B109

DATA

LATCH

CLOCK

OUTPUT

VIDEO1

X1101

24.576MHz

B

C

76

78

C

SCLK

SWDT

INPUT

77

J305

LTV/DBS

L

LOUTPUT

J304

LINPUT

L

LINPUT

DIGITAL AUDIO

I/F RECEIVER

IC1101

47

D IN

27

XO

26

XI

40

SWDT

42

SCLK

41

XLAT

11

RESET

2

XLAT

RESET

D OUT

LRCK

ERROR

SRDT

CLK

BCK

SELECTOR

1

2

6

7

9

10

CONTROL

35

29

34

36

30

38

75

SRDT

IC303

CE13CLK15DI

14

S LAT

S CLK

S DATA

X1301

49.152MHz

IC1305 IC1305

D1201

67

ERROR

4

8

11

IC1305

Q1203

14

ANALOG/DIG

IC1108

IC1102

IC1403 CLOCK

13 10

DIVIDE

MEMORY

D0-7

IC1302

IC1305

IC1102

A0-7

A8-15

SYSTEM

CONTROL

IC1201

LATCH IC1303 IC1304

DOLBY

DIGITAL AUDIO DECODER

IC1301

22

SDATA 1

27

SDATA 2

44

MCLK

43

SCK

25

SCLK1

28

SCLK2

42

RCLK

26

LRCLK1

29

LRCLK2

30

CLK

D0-7

5

EMRD

21

EXTMEM

SCD IN

SCCLK

7

6CS18

IC1202

16

15

SCCLK

SCDOUT

AUDATA0 AUDATA1 AUDATA2

SCDOUT

INTREQ

17CS20

36

41 40 39

19 20

RESET

Q1204

19

18

INTREQ

SCDIN

SRAM IC1402

Q1205

25 32

AD0 AD7

D0-7

A0-7

D0-7

35

HA0

IC304 IC1104 IC1104

AUDIO DSP

IC1401

SOA

113

BCK0

SOB

115

LRCK

SOC

99

CLK1

117

SIA

118

SIB

119

SIC

74

XWE

70

XOE

16 20

HD0

.

23

HD7

25

SOD

15

HA0

HRDY

XHDRD10XHDCS14XRST

XHDWR

9

26

IC1202

21

22

24

36

XRST

XHDCS

XHDRD

XHDWR

BALANCE

RV402

79

106

PROTETOR

VOLUME

RV401

IC408

IC410

IC409

101

102

103

105

104

RY HP

RY FRONT A

RY FRONT B

RY CENTER

RY WOOFER

RY REAR

DISP DATA

DISP CLK

RY POWER

DISP MR

STOP

SOTO

SINO

MD2 MD0

DATA CLK LAT

107

52 55 51

53SREQ 90RESET

64 10

9 87 89

VOL CONT

IC414

14

IN

9

DATA

8

CLK

10

LAT

VOL CONT

IC416

3

IN

14

IN

9

DATA

8

CLK

10

LAT

VOL CONT

IC415

14

IN

9

DATA

8

CLK

10

LAT

M

OUT

Q120

LED

DRIVE

L

15

C

2

A

W

15

SL

15

UP

DOWN

B

LED VOL

AC MUTE PROTECTOR

RY HP RY FRONT A RY FRONT B

RY CENTER RY WOOFER RY REAR

U DATA U CLOCK U MREQ

U SREQ U REST RY POWER STOP

SOTO SINO MD2 MD0

C

D

AUDIO CODEC

IC1103

30

LIN+

29

LIN-

9

SDTO

39

MCLK1

4

BCLK

5

LRCK

6

2 3 4

5

13

Q1206

23

37

HRDY

SOD

7 8

Q1207

SDTI 1 SDTI 2 SDTI 3

CDTO

44

6

CDTO

CDTI43CCLK42CS41PD

5

CDTI

L OUT1

L OUT3

R OUT3

L OUT2

4

CCLK

17

3CS7PD108

IC1104

27

IC1105

23

IC1105

24

IC1106

25

Q301

RELAY DRIVE

85

RY DIRECT PASS

Q1201

MUTE CONT

Q1202

FUN MUTE

XI

X1201

4MHz

RY301

92XO93

IC405

MUTE Q302

IC407

MUTE Q304

IC407

MUTE Q354

IC406

MUTE Q303

LAT

CLK

DATA

48

50

49

84

EV STB

EV CLK

EV DATA

AC MUTE

— 9 — — 10 —

• RCH is omitted

• Signal Path

: FM

: PHONO

: CD

: DIGITAL

3-3. BLOCK DIAGRAM – POWER SECTION –

STR-DE725

A

B

D

B

L

C

W

SL

AC MUTE

PROTECTOR

RY HP

RY FRONT A

FRONT B

RY CENTER

RY WOOFER

RY REAR

RY POWER

STOP

URESET

USREQ

UMREQ

UCLOCK

UDATA

SOTO

SINO

MD2 MD0

DOWN

LED VOL

POWER AMP(L)

IC501

13 VCC

+B

14 15

-B

6

1

POWER AMP(C/W)

13 VCC

+B

14 VCC 15

-B

8

1 MUT

6

POWER AMP(SL)

13 VCC

+B

14 15

-B

6

1

MUTE

Q501,503

UP

7

MOTOR

DRIVE

IC106

8

55

3

56

2

88

16

49

UP

DOWN

LED VOL

VCC VEE

IN

MUT

VEE

IN

VCC VEE

IN

MUT

MD0

51

IC601

IC701

20

MD2

+VE

NF

-VE

+VE

NF

-VE

+VE

NF

-VE

19

SINO

38

2

5

3

12

9

11

2+VE 3-VE

2

5

3

61

SOTO

AD KEY1

62

UDATA

LIMITER

60

UCLOCK

Q504

Q505

Q604

Q605

Q704

Q705

UMREQ

39

59

USEQ

AD KEY2

BOOSTER

Q506

BOOSTER

Q507

BOOSTER

Q606

BOOSTER

Q607

BOOSTER

Q706

BOOSTER

Q707

40

AD KEY3

CUR DET

Q508

CUR DET

Q608

CUR DET

Q708

D109,110

DRIVE

Q109,110

1

MODE CONTROL

AD KEY4

41

LED

LED V1

PROTECTOR

Q547-549

2

LED V2

IC102

D114,115

LED

DRIVE

Q114,115

6

LED TAPE

7

AD KEY5

43

LED MD/DAT

PROTECTOR

Q509,510

PROTECTOR

Q609,610

D111-113 D116-118

Q111-113 Q118-116

4

3

LED V3

LED DVD/LD

44

LED

DRIVE

5

10

LED TV/DBS

LED PHONO

AD KEY6

Q511

Q611

8

9

LED CD

LED TUNER

72

D101

LED

DRIVE

Q102

90

SP B73SP A

LED MUTE

POWER KEY

74

D104-106

LED

DRIVE

Q103,104

Q106

15

16

LED EQ

LED INDEX

RELAY DRIVE

Q601

D1202

D1203

D100,108 D119,122

Q107,108 Q119,122

92

14

LED SUR

LED DOLBY DIGITAL

FL CLK21FL LAT24FL CLEAR

25

RY602

LED

DRIVE

91

87

89

LED BASS B

LED ON/OFF

LED SOUND FIELD

RELAY DRIVE

Q546

RELAY DRIVE

Q596

24

RY501

RY502

RELAY DRIVE

Q645

RELAY DRIVE

Q544

RELAY DRIVE

Q749

82XO83

ABUS OUT

67

X101

RY601

RY503

RY701

XI

IMPEDANCE

SELECTOR

SIRCS

URESET

RESET

STOP

ABUS A1 IN

63

S501

26

58

77

47

R CH

+B

-B

R CH

8

4

L

R

C

S(L)

S(R)

SWITCH

Q612,615

Q101

J701

PHONES

SURROUND

J501

WOOFER

CNJ701

WIRELESS

REAR

SPEAKER

TM501 FRONT

SPEAKER

TM701

SPEAKER

SWITCH

Q613,616

REMOTO CONTROL RECEIVER

RESET

Q105

IC101

SWITCH

Q618

INV SW

Q617

1

+5.6V

IC809

+5V REG

3

TU +5V

TU +12V

+15V

-15V

IC702

+18V REG

POWER

1

+32V

+24V

-24V

D5V

D3.3V

DELAY +B SW

Q902

3

CONT IC901

6

Q747,748

58

1

3

1

3

SWITCH

Q801 +32V

REG

3

IC404

+5V

REG

IC403

+12V REG

IC401

+15V REG

IC402

-15V REG

IC801

5V

REG IC802 +3.3V

REG IC803 +3.3V

REG

D901-904

• RCH is omitted

• Signal Path

:FM

:CD

3

1

3

2

T901

F801

D801

F802

T902

RY901

F803

F804

F805

F2

F1

JW925

F901

CNJ901

CNP901

AC IN

D802-805

D808

1

RELAY

DRIVE

Q901

FUNCTION

KEY

S106,110,114,118 S122,126,128,130

FUNCTION

KEY

S105,109,113,117 S121,125,127,129

FUNCTION

KEY

S104,108,112 S116,120,124

FUNCTION

KEY

S103,107,111 S115,119,122

S102

S140-145,147 S132,133

MUTING

FUNCTION

KEY

FUNCTION

S135-139,146

KEY

SPEAKER

SWITCH

S134

S131

POWER

F2

26

34

24

LAT

CLK

CLR

DIN

FL DRIVE FL DRIVE

FLOURESCENT

INDICATOR TUBE

29

FL101

4LS29

CLK

3

DOUT

IC105IC104

5CL30

Q180

DIN FL DAT

F1

I/O

BUFFER

— 11 — — 12 —

J204

S-LINK

STR-DE725

3-4. PRINTED WIRING BOARD — AMP SECTION —

• Semiconductor Location

Ref. No. Location

D501 E-6

D502 E-6 D503 E-6 D504 E-6 D505 B-4 D506 B-4 D545 B-3 D546 E-3 D547 D-12 D548 D-12 D549 D-12 D551 E-11 D552 E-11 D553 E-11 D554 E-11 D555 C-4 D556 B-4 D601 E-8 D602 E-8 D603 E-8 D604 E-9 D608 C-11 D647 D-3 D648 E-4 D801 C-8 D802 D-10 D803 C-9 D804 D-10 D805 D-10 D806 B-10 D807 D-8

D809 C-12

IC809 C-12 Q504 E-6

Q505 E-6 Q506 E-5 Q507 F-7 Q508 E-7 Q509 B-4 Q510 B-4 Q511 B-4 Q546 B-11 Q547 D-12 Q548 D-12 Q549 D-12 Q554 E-11 Q555 E-11 Q556 E-10 Q557 E-12 Q558 E-12 Q559 C-4 Q560 B-4 Q561 B-4 Q596 B-11 Q601 B-11 Q604 E-9 Q605 E-8 Q606 E-8 Q607 E-9 Q608 E-9 Q612 E-4 Q613 D-4 Q615 E-3 Q616 D-3 Q617 D-3 Q618 D-3 Q801 D-8

A

B

C

D

E

F

G

H

12

AMPLIFIER BOARD

TM501

FRONT

SPEAKERS

B A

L

A B

B A

R

A B

• See page 7 for Circuit Boards Location.

345678910111213

E

EE

1

EE

E

EE

(Page 34) (Page 34)

1

6

51

11

BCE BCE

Q506 Q505 Q507 Q606 Q605 Q607 Q556 Q555 Q557

JOINT BOARD

1

11

16

(Page 37)

MQ

+

∼

−

E

2

1

O

(Page 26)

(Page 37) (Page 43)

7

1

(Page 33)

NLPI

EE

E

1

3

1

3

1

EEEEEE

1

3

D809

3

EE

E

11

BCE BCE

BCE

BCE BCE

1-670-025-

(12)

X

(Page 33)

H.P BOARD

1-670-006-

1

3

11

(13)

1-670-027-

1

(Page 25)

R

11

J701

PHONES

(12)

— 13 — — 14 —

3-5. SCHEMATIC DIAGRAM — AMP SECTION —

STR-DE725

— 15 — — 16 —

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

STR-DE725

3-6. PRINTED WIRING BOARD — VIDEO SECTION —

A

B

C

• See page 7 for Circuit Boards Location.

12

VIDEO BOARD

TV/DBS

VIDEO IN VIDEO IN

DVD/LD

18

3456789

VIDEO 2

VIDEO OUT VIDEO IN

3

VIDEO 1

VIDEO OUT VIDEO IN

MONITOR

VIDEO OUT

1-670-003-

S-LINK

CTRL A1

11

(13)

D

E

16

916

10 2

11 1

C

(Page 29)

1

• Semiconductor

Location

Ref. No. Location

D201 C-2 D202 C-2

IC201 C-2 IC202 C-4

— 17 — — 18 —

STR-DE725

3-7. SCHEMATIC DIAGRAM — VIDEO SECTION —

• See pages 61 for IC Block Diagrams.

— 19 — — 20 —

STR-DE725

3-8. PRINTED WIRING BOARD — AUDIO SECTION —

• Semiconductor

Location

Ref. No. Location

IC303 G-8

IC408 D-6 IC409 C-6 IC410 B-6

A

12

B

C

D

E

• See page 7 for Circuit Boards Location.

3456789101112

(Page 26)

E

VOLUME BOARD

110

MASTER VOLUME

R108

(Page 25)

K

TUNER BOARD

18

1

C382

11

1

S

18

(Page 43)

D

(Page 26)

11

8

1

4

1

1-670-011-

11

(13)

1

5

1-670-000-

1

11

(13)

F

G

H

A

(Page 29)

(Page 25)

F

TM301

AUDIO BOARD

BALANCE

11

1-670-015-

(13)

BALANCE BOARD

I

16

L

R

L

R

16

L

R

L

R

30

115

1-670-001-

L

11

(13)

R

J

IN

— 21 —

TAPE

REC OUT

IN

REC OUT

MD/DAT

IN

CD

J305J304

— 22—

IN

PHONO

3-9. SCHEMATIC DIAGRAM — AUDIO SECTION —

STR-DE725

— 23 —

— 24 —

STR-DE725

3-10. PRINTED WIRING BOARD — INPUT SECTION — • See page 7 for Circuit Boards Location.

• Semiconductor

Location

Ref. No. Location

D301 F-10

IC301 C-4 IC302 D-4 IC304 E-6 IC401 C-12 IC402 B-12 IC403 D-12 IC404 E-4 IC405 E-12 IC406 D-12 IC407 D-12 IC414 B-11 IC415 C-11 IC416 D-11 IC501 C-9 IC601 D-7 IC701 C-7

Q301 F-11 Q302 E-11 Q303 E-11 Q304 D-11 Q352 E-11 Q353 D-10 Q354 D-11 Q501 C-10 Q503 C-10

A

B

C

D

E

12

INPUT BOARD

L

IN

REC OUT

IN

R

L

R

L

R

L

R

TAPE/MD

CD

PHONO

345678910111213

(Page 14) (Page 34) (Page 22) (Page 14)

R H

1

30

4

1

5

8

15

16

15

3

1

13

1

3

18

6

1

15

E

15

14

E

1

18

16

18

16

18

16

EEE

E

9

12

18

1

3

1

3

18

ID

3

1

10

1

E

F

16

1-670-026-

11

F

VK

G

(Page 43)(Page 22)(Page 22) (Page 18)

(12)

E

(Page 21)

— 25 —

— 26 —

STR-DE725

3-11. SCHEMATIC DIAGRAM — INPUT SECTION —

• See page 61 for IC Block Diagrams.

— 27 — — 28 —

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

STR-DE725

3-12. PRINTED WIRING BOARD — DISPLAY SECTION —

• Semiconductor

12

Location

Ref. No. Location

D100 H-2

D101 E-2 D102 B-13 D103 B-9 D104 C-12 D105 C-12 D106 C-12 D108 C-3 D109 J-6 D110 J-7 D111 J-7 D112 J-8 D113 J-9 D114 I-6 D115 I-7 D116 I-7 D117 I-8 D118 I-9 D119 D-3 D120 H-14 D121 H-14 D122 C-3 D180 B-3

IC101 C-4 IC102 D-6 IC103 C-1 IC104 D-8 IC105 C-7

Q101 C-4 Q102 B-4 Q103 B-11 Q104 B-11 Q105 C-4 Q106 B-11 Q107 B-6 Q108 B-4 Q109 B-11 Q110 B-11 Q111 B-12 Q112 B-12 Q113 B-12 Q114 B-12 Q115 B-12 Q116 B-12 Q117 B-13 Q118 B-13 Q119 B-4 Q120 B-4 Q122 B-3 Q180 B-3

A

B

C

D

E

F

G

H

I

DISPLAY BOARD

(Page 17)

C

(Page 21)

9

A

CNS107

14

MUTING

L.B BOARD

LED BOARD

(MULTI CHANNEL DECODING)

2

1

SW BOARD

111 2

1

1-670-014-

10

11

(13)

1-670-007-

SHIFT

• See page 7 for Circuit Boards Location.

3456789101112131415

(Page 43)

B

C192

DISPLAY

PRESET TUNING

MEMORY

FM/AM FM MODE SLEEP

MULTI

CURSOR

CONTROL

1

5

TUNING

1-670-008-

(SOUND FIELD)

(EQ)

(BASS BOOST)

441

12

E

E E E

E

13

1

C191

R122

80

81

41

51 50

1100

E

31

30

RR21

RR22

RR23

JW231

C123

C124

EEE

64

41 41

EE

EEE EEE

(SURROUND)

(EQUALIZER)

(INDEX)

11

2 13

(13)

SP SW BOARD

11

(13)

1 2 3 4

CD TUNER PHONO

TV/DBSDVD/LDVIDEO 2VIDEO 1

14

INPUT MODE

EQ

ON/OFF

SOUND FIELD

GENRE MODE

14 14

6

TAPE/MD

0987

BASS

BOOST

14

SOUND

FIELD

ON/OFF

B A A+BOFF

SPEAKERS

5

SET UP

1

CURSOR MODE

J

DIRECT TUNING

1

2 3 4 5

11

16

1-670-009-

(13)

1-670-010-

11

(13)

— 29 — — 30 —