STR-DH740 - Sony Audio Service Manual (repair manual)

str-dh740 service manual
Model
STR-DH740
Pages
84
Size
5.5 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
str-dh740.pdf
Date

Read Sony STR-DH740 Service Manual online

SERVICE MANUAL
Sony Corporation
Published by Sony EMCS (Malaysia) PG Tec
MULTI CHANNEL AV RECEIVER
US Model
Canadian Model
AEP Model
Australian Model
Mexican Model
Taiwan Model
STR-DH740
Ver. 1.0  2013.01
9-890-616-01
2013A80-1
© 
2013.01
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC 
DISTORTION: 
(US model only)
With 6 ohm loads, both channels driven, from 20 – 
20,000 Hz; rated 90 watts per channel minimum 
RMS power, with no more than 0.09% total harmonic 
distortion from 250 milliwatts to rated output.
Amplifi er section
Mexico model
1)
Minimum RMS Output Power
(6 ohms, 20 Hz – 20 kHz, THD 0.09%)
 
90 W + 90 W
Stereo Mode Output Power
(6 ohms, 1 kHz, THD 1%)
 
100 W + 100 W
Surround Mode Output Power
2)
(6 ohms, 1 kHz, THD 0.9%)
 
140 W per channel
Other models
1)
Minimum RMS Output Power
(6 ohms, 20 Hz – 20 kHz, THD 0.09%)
 
90 W + 90 W
Stereo Mode Output Power
(6 ohms, 1 kHz, THD 1%)
 
105 W + 105 W
Surround Mode Output Power
2)
(6 ohms, 1 kHz, THD 0.9%)
 
145 W per channel
1)
 Measured under the following conditions:
Area
Power requirements
US, CND, TW
120 V AC, 60 Hz
MX
127 V AC, 60 Hz
AEP, AUS
230 V AC, 50 Hz
2)
 Reference power output for front, center, surround, 
surround back and front high speakers. Depending 
on the sound fi eld settings and the source, there may 
be no sound output.
Frequency response
  Analog 
10 Hz – 100 kHz, +0.5/–2 dB 
  
(with sound fi eld and equalizer
  
bypassed)
Input
  Analog 
Sensitivity: 500 mV/50 kilohms
  
S/N
3)
: 105 dB (A, 500 mV
4)
)
  Digital (Coaxial)  Impedance: 75 ohms
   
S/N: 100 dB (A, 20 kHz LPF)
  Digital (Optical)  S/N: 100 dB (A, 20 kHz LPF)
Output (Analog)
  SUBWOOFER 
Voltage: 2 V/1 kilohm
Equalizer
  Gain levels 
±10 dB, 1 dB step
3)
 INPUT SHORT (with sound fi eld and equalizer 
bypassed).
4)
 Weighted network, input level.
SPECIFICATIONS
This receiver incorporates Dolby* Digital and Pro Logic Surround 
and the DTS** Digital Surround System.
*  M a n u f a c t u r e d u n d e r l i c e n s e f r o m D ol b y L a b o r a t o r ie s . 
Dolby, Pro Logic, Surround EX, and the double-D symbol are 
trademarks of Dolby Laboratories.
** Manufactured under license under U.S. Patent Nos: 5,956,674; 
5,974,380; 6,226,616; 6,487,535; 7,212,872; 7,333,929; 7,392,195; 
7,272,567 & other U.S. and worldwide patents issued & pending. 
DTS-HD, the Symbol, & DTS-HD and the Symbol together are 
registered trademarks & DTS-HD Master Audio is a trademark 
of DTS, Inc. Product includes software. © DTS, Inc. All Rights 
Reserved.
This receiver incorporates High-Definition Multimedia Interface 
(HDMI
TM
) technology. The terms HDMI and HDMI High-Defi nition
Multimedia Interface, and the HDMI Logo are trademarks or registered
trademarks of HDMI Licensing LLC in the United States and other 
countries.
iPhone, iPod, iPod classic, iPod nano, and iPod touch are trademarks 
of Apple Inc., registered in the U.S. and other countries.
All other t radema rks a nd registered t radema rks a re of thei r
respective holders. In this manual, ™ and ® marks are not specifi ed.
“Made for iPod” and “Made for iPhone” mean that an electronic 
accessory has been designed to connect specifically to iPod or 
iPhone, respectively, and has been certifi ed by the developer to meet 
Apple performance standards.
Apple is not responsible for the operation of this device or its 
compliance  with  safety  and  regulatory  standards.  Please  note  that 
the use of this accessory with iPod or iPhone may affect wireless 
performance.
Windows Media is either a registered trademark or trademark of 
Microsoft Corporation in the United States and/or other countries.
This product is protected by certain intellectual property rights 
of Microsoft Corporation. Use or distribution of such technology 
outside of this product is prohibited without a license from Microsoft
or an authorized Microsoft subsidiary.
MPEG Layer-3 audio coding technology and patents licensed from 
Fraunhofer IIS and Thomson.
“x.v.Color (x.v.Colour)” and “x.v.Color (x.v.Colour)” logo are
trademarks of Sony Corporation.
“BRAVIA” is a trademark of Sony Corporation.
“ Play St at ion” i s a r eg i st e r e d t r a de m a r k of Sony C omput e r 
Entertainment Inc.
“WALKMAN” is a registered trademark of Sony Corporation.
MICROVAULT is a trademark of Sony Corporation.
InstaPrevue™ is a trademark or registered trademark of Silicon
Image, Inc. in the United States and other countries.
– Continued on next page –
2
STR-DH740
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 PUBLISHED BY SONY.
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 COMPOSANTS 
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT 
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉ-
MENTS PUBLIÉS PAR SONY.
FM tuner section
Tuning range 
87.5 MHz – 108.0 MHz
Antenna (aerial) 
FM wire antenna (aerial)
Antenna (aerial) terminals 
   
75 ohms, unbalanced
AM tuner section
Tuning range
Area
Tuning scale
10 kHz step  9 kHz step
US, CND, MX
530 kHz –  531 kHz –
1,710 kHz  1,710 kHz
AEP, AUS, TW
– 
531 kHz –
 1,602 
kHz
Antenna (aerial) 
Loop antenna (aerial)
Video section
Inputs/Outputs
  Video: 
1 Vp-p, 75 ohms
iPod/iPhone section
DC 5V 1.0 A MAX
USB section
Supported format* 
MP3 (MPEG 1 Audio Layer-3):
32 kbps – 320 kbps, VBR
WMA: 48 kbps – 192 kbps
AAC: 48 kbps – 320 kbps
   
WAV: 8 kHz – 48 kHz 16 bit PCM
*Compatibility with all encoding/writing software,
   
recording devices and recording media cannot be
  
guaranteed.
Transfer speed 
Full-speed
Supported USB device
 
Mass Storage Class
Maximum current 
500 mA
General
Power requirements
Area
Power requirements
US, CND, TW
120 V AC, 60 Hz
MX
127 V AC, 60 Hz
AEP, AUS
230 V AC, 50/60 Hz
Power consumption  240 W
Power consumption (during standby mode)
0.3 W (When “Control for HDMI” and “Pass 
Through” are set to “Off”.)
Dimensions (width/height/depth) (Approx.)
430 mm × 156 mm × 329.4 mm (17 in × 6 
1/4
 in × 
13 in) including projecting parts and controls
Mass (Approx.) 
8.0 kg (17 lb 11 oz)
Design and specifi cations are subject to change without notice.
Supplied accessories
• Operating 
Instructions
• 
Quick Setup Guide (1)
• 
Remote control (RM-AAU168) (1)
• 
R6 (size AA) batteries (2)
• 
FM wire antenna (aerial) (1)
• 
AM loop antenna (aerial) (1)
• 
Optimizer microphone (ECM-AC2) (1)
• Abbreviation
AUS : Australian model
CND  : Canadian model
MX  : Mexican model
TW  : Taiwan model
SAFETY CHECK-OUT (US MODEL)
After correcting the original service problem, perform the following 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 chas-
sis, 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 Simp-
son 250 and Sanwa SH-63Trd are examples of a passive VOM that 
is suitable. Nearly all battery operated digital multimeters that have a 
2 V AC range are suitable. (See Fig. A)
1.5 k
Ω
0.15 
μF
AC 
voltmeter 
(0.75 V) 
To Exposed Metal 
Parts on Set 
Earth Ground
Fig. A.  Using an AC voltmeter to check AC leakage.
3
STR-DH740
1. 
SERVICING  NOTES
  .............................................   4
2. DISASSEMBLY
2-1. Case 
(Entry) 
....................................................................   5
2-2.   Front Panel Section .........................................................   6
2-3.  DCDC Board, STANDBY Board ...................................   7
2-4.  Back Panel Section .........................................................   8
2-5.  MAIN Board Section ......................................................   8
2-6. MAIN 
Board 
...................................................................   9
3. 
TEST  MODE 
 ............................................................   10
4. 
FM  TUNER  CHECK 
 .............................................   13
5. DIAGRAMS
5-1.  Block Diagram - ANALOG AUDIO Section - ...............   15
5-2.  Block Diagram - DIGITAL Section -..............................   16
5-3.  Block Diagram - AMP Section - .....................................   17
5-4.  Block Diagram - ANALOG VIDEO/USB Section - ......   18
5-5.  Block Diagram - DIGITAL VIDEO Section - ................   19
5-6.  Block Diagram - DISPLAY/POWER Section - ..............   20
5-7. Printed 
Wiring 
Board 
- DIGITAL Board (Component Side) - ...........................   22
5-8. Printed 
Wiring 
Board 
- DIGITAL Board (Conductor Side) - .............................   23
5-9.  Schematic Diagram - DIGITAL Board (1/7) - ................   24
5-10.  Schematic Diagram - DIGITAL Board (2/7) - ................   25
5-11.  Schematic Diagram - DIGITAL Board (3/7) - ................   26
5-12.  Schematic Diagram - DIGITAL Board (4/7) - ................   27
5-13.  Schematic Diagram - DIGITAL Board (5/7) - ................   28
5-14.  Schematic Diagram - DIGITAL Board (6/7) - ................   29
5-15.  Schematic Diagram - DIGITAL Board (7/7) - ................   30
5-16. Printed Wiring Board 
- MAIN Board (Component Side) - ................................   31
5-17. Printed Wiring Board 
- MAIN Board (Conductor Side) - ..................................   32
5-18.  Schematic Diagram - MAIN Board (1/4) - .....................   33
5-19.  Schematic Diagram - MAIN Board (2/4) - .....................   34
5-20.  Schematic Diagram - MAIN Board (3/4) - .....................   35
5-21.  Schematic Diagram - MAIN Board (4/4) - .....................   36
5-22.  Printed Wiring Board - DISPLAY Board - .....................   37
5-23.  Schematic Diagram - DISPLAY Board - ........................   38
TABLE  OF  CONTENTS
5-24.  Printed Wiring Board - DCDC Board - ..........................   39
5-25.  Schematic Diagram - DCDC Board - .............................   40
5-26.  Printed Wiring Board - STANDBY Board - ...................   41
5-27.  Schematic Diagram - STANDBY Board - ......................   42
5-28. Printed Wiring Board 
- FRONT JACK PWB Board - .......................................   43
5-29. Schematic Diagram 
- FRONT JACK PWB Board - .......................................   43
5-30.  Printed Wiring Board - TUNER1 Board - ......................   43
5-31.  Schematic Diagram - TUNER1 Board - .........................   44
5-32.  Printed Wiring Board - POWER KEY Board -...............   45
5-33.  Schematic Diagram - POWER KEY Board - .................   45
5-34.  Printed Wiring Board - HEADPHONE Board - .............   45
5-35.  Schematic Diagram - HEADPHONE Board - ................   45
6. 
EXPLODED  VIEWS
6-1.  Case (Entry) Section .......................................................   61
6-2.  DCDC Board Section ......................................................   62
6-3.  Front Panel Section .........................................................   63
6-4.  Back Panel Section .........................................................   64
6-5. Chassis 
Section 
...............................................................  65
7. 
ELECTRICAL  PARTS  LIST
  ..............................   66
4
STR-DH740
SECTION  1
SERVICING  NOTES
Part No.
MODEL IDENTIFICATION
–BACK PANEL–
Model
Part No.
US, Canadian
4-448-712-0[]
AEP
4-448-712-2[]
Australian
4-448-712-3[]
Taiwan
4-448-712-4[]
Mexican
4-448-712-5[]
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.
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the 
lead-free 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 fl ow) 
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.
Special Component Notice
The components identified by mark 
9 contain confidential
information.
Strictly follow the instructions whenever the components are
repaired and/or replaced.
Notice pour composants spéciaux
Les composants identifiés par la marque 
9 contiennent des
informations confi dentielles.
Suivre scrupuleusement les instructions chaque fois qu’un com-
posant est remplacé et / ou réparé.
NOTE  OF  REPLACING  THE  IC1902,  IC1903  AND  
IC1904  ON  THE  DCDC  BOARD
IC1902, IC1903 and IC1904 on the DCDC board cannot exchange
with single. When these parts on the DCDC board are damaged, 
exchange the entire mounted board.
NOTE  OF  REPLACING  THE  IC3506  ON  THE  DIGITAL
BOARD
IC3506 on the DIGITAL board cannot exchange with single. 
When this part on the DIGITAL board is damaged, exchange the 
entire mounted board.
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