SONY STRDB870 - Service Manual Immediate Download

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

SPECIFICATIONS

STR-DB870/DB1070

Photo: STR-DB870

Ver. 1.6 2005.09

9-873-842-17

Sony Corporation

2005I05-1

Audio Group

Published by Sony Engineering Corporation

US Model

E Model

Chinese Model

STR-DB1070

Canadian Model

AEP Model

UK Model

STR-DB870/DB1070

Continued on next page

This receiver incorporates Dolby* Digital and Pro Logic Surround

and the DTS** Digital Surround System.

* 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 registered trademarks

of Digital Theater Systems, Inc.

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 (Models of area code

U only).

Amplifier section

POWER OUTPUT

Models of area code U, CA

Rated Power Output at Stereo Mode

(8 ohms 20 Hz 20 kHz, THD 0.09 %)

100 W + 100 W

(4 ohms 20 Hz 20 kHz, THD 0.09 %)

90 W + 90 W

Reference Power Output

(8 ohms 20 Hz 20 kHz, THD 0.09 %)

STR-DB1070:

FRONT1):100 W + 100 W

CENTER1): 100 W

SURR1): 100 W + 100 W

SURR BACK1): 100 W

STR-DB870:

FRONT1): 100 W + 100 W

CENTER1): 100 W

SURR1): 100 W + 100 W

(4 ohms 20 Hz 20 kHz, THD 0.09 %)

STR-DB1070:

FRONT:1) 90 W + 90 W

CENTER1): 90 W

SURR1): 90 W + 90 W

SURR BACK1): 90 W

STR-DB870:

FRONT1):90 W + 90 W

CENTER1): 90 W

SURR1): 90 W + 90 W

Models of other area code

Rated Power Output at Stereo Mode

(8 ohms 1 kHz, THD 0.7 %)

STR-DB1070:

100 W + 100 W2)

90 W + 90 W3)

STR-DB870:

100 W + 100 W2)

(4 ohms 1 kHz, THD 0.7 %)

STR-DB1070:

90 W + 90 W2)

80 W + 80 W3)

STR-DB870:

100 W + 100 W2)

Reference Power Output2)

(8 ohms 1 kHz, THD 0.7 %)

STR-DB1070:

FRONT1): 100 W + 100 W

CENTER1): 100 W

SURR1): 100 W + 100 W

SURR BACK1): 100 W

STR-DB870:

FRONT1): 100 W + 100 W

CENTER1): 100 W

SURR1): 100 W + 100 W

(4 ohms 1 kHz, THD 0.7 %)

STR-DB1070:

FRONT1): 90 W + 90 W

CENTER1): 90 W

SURR1): 90 W + 90 W

SURR BACK1): 90 W

STR-DB870:

FRONT1): 100 W + 100 W

CENTER1): 100 W

SURR1): 100 W + 100 W

(8 ohms 20 Hz 20 kHz, THD 0.09 %)

STR-DB1070:

FRONT1): 90 W + 90 W

CENTER1): 90 W

SURR1): 90 W + 90 W

SURR BACK1): 90 W

STR-DB870:

FRONT1): 90 W + 90 W

CENTER1): 90 W

SURR1): 90 W + 90 W

(4 ohms 20 Hz 20 kHz, THD 0.09 %)

STR-DB1070:

FRONT1): 80 W + 80 W

CENTER1): 80 W

SURR1): 80 W + 80 W

SURR BACK1): 80 W

STR-DB870:

FRONT1): 90 W + 90 W

CENTER1): 90 W

SURR1): 90 W + 90 W

1) Depending on the sound field settings and the

source, there may be no sound output.

2) Measured under the following conditions:

Area code

Power requirements

240 V AC, 50 Hz

CN, SP, CEL, KR

230 V AC, 50 Hz

110 V AC, 60 Hz

3) Measured under the following conditions:

Area code

Power requirements

220 V AC, 50 Hz

Frequency response

PHONO

CD/SACD, TAPE,

MD/DAT, MD/TAPE,

TV/SAT, DVD/LD,

VIDEO 1, 2, 3

RIAA equalization curve

±0.5 dB

10 Hz 100 kHz

±3 dB (with sound field,

equalizer, and bass boost

bypassed)

STR-DB870/DB1070

· Abbreviation

CA : Canadian model

CEL : AEP and UK models

CN : Chinese model

KR : Korean model

: Malaysia and Singapore models

TW : Taiwan model

: US model

Separation

45 dB at 1 kHz

Frequency response

30 Hz 15 kHz,

+0.5/2 dB

Selectivity

60 dB at 400 kHz

AM tuner section

Tuning range

Models of area code U, CA

With 10-kHz tuning scale: 530 1.710 kHz6)

With 9-kHz tuning scale: 531 1.710 kHz6)

Models of area code E

With 10-kHz tuning scale: 530 1.610 kHz6)

With 9-kHz tuning scale: 531 1.602 kHz6)

Models of area code CN, SP, CEL, TW, KR

With 9-kHz tuning scale: 531 1.602 kHz

Antenna

Loop antenna

Usable sensitivity

50 dB/m (at 1,000 kHz or

999 kHz)

S/N

54 dB (at 50 mV/m)

Harmonic distortion

0.5 % (50 mV/m,

400 kHz)

Selectivity

At 9 kHz:

35 dB

At 10 kHz:

40 dB

6) You can change the AM tuning scale to 9 kHz or

10 kHz. After tuning in any AM station, turn off

the receiver. Hold down TUNING and press

?/1

. All preset stations will be erased when you

change the tuning scale. To reset the scale to

10 kHz (or 9 kHz), repeat the procedure.

Video section

Inputs

Video:

1 Vp-p, 75 ohms

S-video:

Y: 1 Vp-p, 75 ohms

C: 0.286 Vp-p, 75 ohms

Outputs

Video:

1 Vp-p, 75 ohms

S-video:

Y: 1 Vp-p, 75 ohms

C: 0.286 Vp-p, 75 ohms

General

Power requirements

Area code

Power requirements

U, CA

120 V AC, 60 Hz

CEL

230 V AC, 50/60 Hz

CN, SP

220 230 V AC, 50/60 Hz

120/220/240 V AC, 50/60 Hz

110 V AC, 60 Hz

220 V 230 V AC, 60 Hz

Power consumption

Area code

Power consumption

STR-DB1070: 300 W

STR-DB1070: 420 VA

STR-DB870: 390 VA

CEL

STR-DB1070: 240 W

STR-DB870: 230 W

CN, SP, E, TW, KR STR-DB1070: 240 W

AC outlets

Area code

AC outlets

U, CA

2 switched, 120 W/1A MAX

SP, CEL, KR

1 switched, 100 W MAX

CN, E, TW

2 switched, 100 W MAX

Dimensions

430

× 161 × 401 mm

including projecting parts

and controls

Mass (Approx.)

16.0 kg

Supplied accessories

FM wire antenna (1)

AM loop antenna (1)

· Models of area code U, CA

Audio/video/control S connecting cord (1)

Control S connecting cord (1)

· STR-DB1070 only

· Models of area code U, CA

Remote commander RM-PP505L (1)

R6 (size-AA) batteries (2)

· Models of other area codes

Remote commander RM-LP205 (1)

R6 (size-AA) batteries (3)

· STR-DB870 only

· Models of area code CA

Remote commander RM-PP505 (1)

R6 (size-AA) batteries (2)

· Models of area code CEL

Remote commander RM-U305 (1)

R6 (size-AA) batteries (2)

Design and specifications are subject to change

without notice.

Inputs (Digital)

DVD/LD (Coaxial)

DVD/LD, TV/SAT,

MD/DAT, MD/TAPE

(Optical)

Outputs

TAPE, MD/DAT, MD/

TAPE (REC OUT),

VIDEO 1, 2 (AUDIO

OUT)

FRONT L/R,

CENTER,

SURROUND L/R,

SURROUND BACK,

SUB WOOFER

BASS:

99 Hz~1.0 kHz

(21 steps)

MID:

198 Hz~10 kHz

(37 steps)

TREBLE:

1.0 kHz~10 kHz

(23 steps)

Gain levels:

±10 dB, 1 dB step

FM tuner section

Tuning range

87.5 - 108.0 MHz

Antenna terminals

75 ohms, unbalanced

Sensitivity

Mono:

18.3 dBf, 2.2

µV/75 ohms

Stereo:

38.3 dBf, 22.5

µV/75 ohms

Usable sensitivity

11.2 dBf, 1

µV/75 ohms

S/N

Mono:

76 dB

Stereo:

70 dB

Harmonic distortion at 1 kHz

Mono:

0.3%

Stereo:

0.5%

Sensitivity:

Impedance: 75 ohms

S/N: 100 dB

(A, 20 kHz LPF)

Sensitivity:

Impedance:

S/N: 100 dB

(A, 20 kHz LPF)

Voltage: 150 mV

Impedance: 1 kilohms

Voltage: 2 V

Impedance: 1 kilohms

Inputs (Analog)

PHONO

MULTI CH IN (1, 2),

CD/SACD, TAPE,

MD/DAT, MD/TAPE,

DVD/LD, TV/SAT,

VIDEO 1, 2, 3

4) INPUT SHORT.

5) Weighted network, input level.

Sensitivity: 2.5 mV

Impedance: 50 kilohms

S/N4): 86 dB (A, 2.5 mV5))

Sensitivity: 150 mV

Impedance: 50 kilohms

S/N4): 96 dB

(A, 150 mV5))

STR-DB870/DB1070

Notes on chip component replacement

· Never reuse a disconnected chip component.

· Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

Fig. A.

Using an AC voltmeter to check AC leakage.

1.5 k

0.15

µF

voltmeter

(0.75 V)

To Exposed Metal

Parts on Set

Earth Ground

SAFETY CHECK-OUT

After correcting the original service problem, perform the follow-

ing safety check 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 TEST

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 microamperes.).

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 pas-

sive VOM that is suitable. Nearly all battery operated digital

multimeters that have a 2 V AC range are suitable. (See Fig. A)

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0

SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE

DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ

DE FONCTIONNEMENT. NE REMPLACER CES COM-

POSANTS QUE PAR DES PIÈCES SONY DONT LES

NUMÉROS SONT DONNÉS DANS CE MANUEL OU

DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

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 PART NUMBERS APPEAR AS

SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

STR-DB870/DB1070

SERVICING NOTES ............................................... 5

GENERAL ................................................................... 6

DISASSEMBLY

3-1. Disassembly Flow ...........................................................

3-2. Case .................................................................................

3-3. S-VIDEO board, VIDEO Board, Tuner .........................

3-4. VIDEO AU Board ........................................................... 10

3-5. DIGITAL Board .............................................................. 10

3-6. MAIN Board ................................................................... 11

TEST MODE .............................................................. 12

ELECTRICAL ADJUSTMENT ............................ 13

DIAGRAMS

6-1. Block Diagram

TUNER/VIDEO INPUT Section .............................. 15

6-2. Block Diagram AUDIO DSP Section ...................... 16

6-3. Block Diagram AUDIO CONTROL Section .......... 17

6-4. Block Diagram POWER AMP Section ................... 18

6-5. Block Diagram

DISPLAY/KEY CONTROL Section ........................ 19

6-6. Block Diagram POWER SUPPLY Section ............. 20

6-7. Note for Printed Wiring Boards

and Schematic Diagrams ................................................ 21

6-8. Schematic Diagram DIGITAL Board (1/5) ............. 23

6-9. Schematic Diagram DIGITAL Board (2/5) ............. 24

6-10. Schematic Diagram DIGITAL Board (3/5) ............. 25

6-11. Schematic Diagram DIGITAL Board (4/5) ............. 26

6-12. Schematic Diagram DIGITAL Board (5/5) ............. 27

6-13. Printed Wiring Board

DIGITAL Board (Component Side) ......................... 28

6-14. Printed Wiring Board

DIGITAL Board (Conductor Side) ........................... 29

6-15. Printed Wiring Board VIDEO Board ....................... 30

6-16. Schematic Diagram VIDEO Board ......................... 31

6-17. Printed Wiring Boards

S-VIDEO/VIDEO AU Boards .................................. 32

6-18. Schematic Diagram

S-VIDEO/VIDEO AU Boards .................................. 33

6-19. Printed Wiring Board MAIN Board ........................ 34

6-20. Schematic Diagram MAIN Board (1/3) .................. 35

6-21. Schematic Diagram MAIN Board (2/3) .................. 36

6-22. Schematic Diagram MAIN Board (3/3) .................. 37

6-23. Printed Wiring Board BIAS Board .......................... 38

6-24. Schematic Diagram BIAS Board ............................. 39

6-25. Printed Wiring Boards DISP/SW Boards ................ 40

6-26. Schematic Diagram DISP/SW Boards .................... 41

6-27. Printed Wiring Boards

H.P/MUTING/POWER/SP/VIDEO 3 Boards ......... 42

6-28. Schematic Diagram

H.P/MUTING/POWER/SP/VIDEO 3 Boards ......... 43

6-29. Printed Wiring Boards

POWER SUPPLY Section ........................................ 44

6-30. Schematic Diagram POWER SUPPLY Section ...... 45

6-31. IC Pin Function Description ........................................... 51

Ver 1.2

EXPLODED VIEWS

7-1. Case Section .................................................................... 63

7-2. Front Panel Section-1 ...................................................... 64

7-3. Front Panel Section-2 ...................................................... 65

7-4. Chassis Section-1 ............................................................ 66

7-5. Chassis Section-2 ............................................................ 67

ELECTRICAL PARTS LIST ............................... 68

TABLE OF CONTENTS

STR-DB870/DB1070

SECTION 1

SERVICING NOTES

· MODEL IDENTIFICATION

Rear Panel

PART No.

Model

PART No.

DB1070 : US model

4-233-610-0[]

DB1070 : Canadian model

4-233-610-1[]

DB1070 : Malaysia and

Singapore models

4-233-610-2[]

DB1070 : Chinese model

4-233-610-3[]

DB1070 : AEP and UK models

4-233-610-5[]

DB1070 : 120 V AC area and

240 V AC area in E models

4-233-610-7[]

DB1070 : Taiwan model

4-233-610-8[]

DB1070 : Korean model

4-233-610-9[]

DB870 : Canadian model

4-233-630-1[]

DB870 : AEP and UK models

4-233-630-2[]

SERVICE POSITION

In checking the DIGITAL board, prepare jig (extension cable J-2501-208-A: 200 mm 21 core).

Connect jig (extension cable J-2501-208-A)

to the MAIN board (CN806, 807) and

DIGITAL board (CN1102, 1103).

DIGITAL board

MAIN board