STR-DB1070, STR-DB870 — Sony Audio Service Manual (repair manual)

Model
STR-DB1070 STR-DB870
Pages
92
Size
8.4 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
str-db1070-str-db870.pdf
Date

View Sony STR-DB1070 / STR-DB870 Service Manual online

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
© 2005.09
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:
FRONT
1)
:100 W + 100 W
CENTER
1)
: 100 W
SURR
1)
: 100 W + 100 W
SURR BACK
1)
: 100 W
STR-DB870:
FRONT
1)
: 100 W + 100 W
CENTER
1)
: 100 W
SURR
1)
: 100 W + 100 W
(4 ohms 20 Hz – 20 kHz, THD 0.09 %)
STR-DB1070:
FRONT:
1) 
90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 90 W + 90 W
SURR BACK
1)
: 90 W
STR-DB870:
FRONT
1)
:90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 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 W
2)
90 W + 90 W
3)
STR-DB870:
100 W + 100 W
2)
(4 ohms 1 kHz, THD 0.7 %)
STR-DB1070:
90 W + 90 W
2)
80 W + 80 W
3)
STR-DB870:
100 W + 100 W
2)
Reference Power Output
2)
(8 ohms 1 kHz, THD 0.7 %)
STR-DB1070:
FRONT
1)
: 100 W + 100 W
CENTER
1)
: 100 W
SURR
1)
: 100 W + 100 W
SURR BACK
1)
: 100 W
STR-DB870:
FRONT
1)
: 100 W + 100 W
CENTER
1)
: 100 W
SURR
1)
: 100 W + 100 W
(4 ohms 1 kHz, THD 0.7 %)
STR-DB1070:
FRONT
1)
: 90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 90 W + 90 W
SURR BACK
1)
: 90 W
STR-DB870:
FRONT
1)
: 100 W + 100 W
CENTER
1)
: 100 W
SURR
1)
: 100 W + 100 W
(8 ohms 20 Hz – 20 kHz, THD 0.09 %)
STR-DB1070:
FRONT
1)
: 90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 90 W + 90 W
SURR BACK
1)
: 90 W
STR-DB870:
FRONT
1)
: 90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 90 W + 90 W
(4 ohms 20 Hz – 20 kHz, THD 0.09 %)
STR-DB1070:
FRONT
1)
: 80 W + 80 W
CENTER
1)
: 80 W
SURR
1)
: 80 W + 80 W
SURR BACK
1)
: 80 W
STR-DB870:
FRONT
1)
: 90 W + 90 W
CENTER
1)
: 90 W
SURR
1)
: 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
E
240 V AC, 50 Hz
CN, SP, CEL, KR
230 V AC, 50 Hz
TW
110 V AC, 60 Hz
3) Measured under the following conditions:
Area code
Power requirements
CN
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)
2
STR-DB870/DB1070
• Abbreviation
CA : Canadian model
CEL : AEP and UK models
CN : Chinese model
KR : Korean model
SP
: Malaysia and Singapore models
TW : Taiwan model
U
: 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 kHz
6)
With 9-kHz tuning scale: 531 – 1.710 kHz
6)
Models of area code E
With 10-kHz tuning scale: 530 – 1.610 kHz
6)
With 9-kHz tuning scale: 531 – 1.602 kHz
6)
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
E
120/220/240 V AC, 50/60 Hz
TW
110 V AC, 60 Hz
KR
220 V – 230 V AC, 60 Hz
Power consumption
Area code
Power consumption
U
STR-DB1070: 300 W
CA
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
EQ
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 
µ
V/75 ohms
Stereo:
38.3 dBf, 22.5 
µ
V/75 ohms
Usable sensitivity
11.2 dBf, 1 
µ
V/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/N
4)
: 86 dB (A, 2.5 mV
5)
)
Sensitivity: 150 mV
Impedance: 50 kilohms
S/N
4)
: 96 dB
(A, 150 mV
5)
)
3
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 
µ
F
AC
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.
4
STR-DB870/DB1070
1.
SERVICING  NOTES
...............................................
5
2.
GENERAL
...................................................................
6
3.
DISASSEMBLY
3-1. Disassembly Flow ...........................................................
8
3-2. Case .................................................................................
9
3-3. S-VIDEO board, VIDEO Board,  Tuner .........................
9
3-4. VIDEO AU Board ........................................................... 10
3-5. DIGITAL Board .............................................................. 10
3-6. MAIN Board ................................................................... 11
4.
TEST  MODE
.............................................................. 12
5.
ELECTRICAL  ADJUSTMENT
............................ 13
6.
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
7.
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
8.
ELECTRICAL  PARTS  LIST
............................... 68
TABLE  OF  CONTENTS
5
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

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  • Parts list (bill of materials).