STR-DH540 - Sony Audio Service Manual (repair manual)

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.

** 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  of  DTS,  Inc.  Product 
includes software. © DTS, Inc. All Rights Reserved.

This receiver incorporates High-Definition Multimedia Interface (HDMI™) 
technology. The terms HDMI and HDMI High-Definition 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 trademarks and registered trademarks are of their respective holders. In 
this manual, ™ and ® marks are not specified.

“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 
certified 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.

“PlayStation” is a registered trademark of Sony Computer 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.

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
Power Output

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

– Continued on next page –

2014K80-1

© 

2014.11

1)

  Measured under the following conditions:

US, CND 

120 V AC, 60 Hz

AEP, UK, AUS 

230 V AC, 50 Hz

2)

 Reference power output for front, center and surround speakers.

  Depending on the sound field 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 field and equalizer bypassed).

4)

  Weighted network, input level.

Tuning range 

87.5 MHz – 108.0 MHz

Antenna (aerial) 

FM wire antenna (aerial)

Antenna (aerial) terminals 

75 ohms, unbalanced

Tuning range

 

10 kHz step 

9 kHz step

US, CND 

530 kHz –   

531 kHz – 

 

1,710 kHz   

1,710 kHz

AEP, UK, AUS 

 

– 

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

Power requirements
Area Power 

US, CND 

120 V AC, 60 Hz

AEP, UK 

230 V AC, 50/60 Hz

AUS 

230 V AC, 50 Hz

Power consumption 

200 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.) 

7.7 kg (16 lb 16 oz)

Design and specifications are subject to change without notice.

•

 

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)

 

Design and specifications are subject to change without notice.

• Halogenated flame retardants are not used in the certain 

printed wiring boards.

Abbreviation
AUS : Australian model
CND : Canadian model

SAFETY  CHECK-OUT
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 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 passive VOM that is suitable. Nearly all battery operated 
digital multimeters that have a 2 V AC range are suitable. (See 
Fig. A)

Ω

μF

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.

0 OR  DOTTED  LINE  

0 ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

0 SUR  

 .............................................  

4

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

 ............................................................   10

 .............................................   13

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
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

6-1.  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

 ..............................   66

US, Canadian

4-442-874-0[]

AEP, UK

4-442-874-1[]

Australian

4-442-874-2[]

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)

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.

NOTE  OF  REPLACING  THE  IC3506  AND  IC4100  ON  
THE  DIGITAL  BOARD
IC3506 and IC4100 on the DIGITAL board cannot exchange with 
single. When these parts on the DIGITAL board are damaged, 
exchange the entire mounted board.

BOARD
When the COMPLETE DIGITAL BOARD is exchanged, please 
perform the following procedures.

a) RESET MODEL AND DESTINATION SETTING
1.  Press the [?/1] button to turn on the main power.
2.  While pressing [DISPLAY] button, press and release the 

[A.F.D.], [MOVIE], [MUSIC] button in order, the message 
“SPECIALIZE” appears.

3.  Press the [ 

M ] or [ m ] key of the remote commander, the 

message “<SPECIAL>” appears.

4.  Press the [

] key of the remote commander to enter the 

Special Menu List.

5.  Press the [ 

M ] or [ m ] key of the remote commander to 

select “MODEL&AREA” then press [

] key of the remote 

commander.

6. Press 

the 

[ 

M ] or [ m ] key of the remote commander to select 

“MD.DST.UNFIX”, press [

] key of the remote commander 

for resetting the model and destination.

b) FIX MODEL AND DESTINATION 

Please refer to “FIX MODEL AND DESTINATION MODE” in 
page 12 for fi xing the model and destination of set.

Note: Refer to SUPPLEMENT-1 for adding SERVICING NOTES 

(TROUBLESHOOTING)