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2010B08-1

© 

2010.02

•  STR-KM2500 is the receiver section in HT-DDW2500.

This receiver incorporates Dolby* Digital and Pro Logic Surround and the DTS** Digital Surround System.
*  Manufactured under license from Dolby Laboratories. Dolby and the double-D symbol are trademarks of Dolby 

Laboratories.

** Manufactured under license under U.S. Patent #’s: 5,451,942; 5,956,674; 5,974,380; 5,978,762; 6,487,535 & other 

U.S. and worldwide patents issued & pending. DTS and DTS Digital Surround are registered trademarks and the 
DTS logos and Symbol are trademarks of DTS, Inc.

©  1996-2008 DTS, Inc. All Rights Reserved.

Design and specifi cations are subject to 
change without notice.

The area code of the receiver you purchased is
shown on the lower right portion of the rear panel
(see the illustration below).

Any differences in operation, according to the area
code, are clearly indicated in the text, for example,
“Models of area code AA only”.

FRONT

CENTER

Area code

Amplifi er section
Models of area code SA

1)

Power Output
Stereo mode (rated) (6 ohms, 1 kHz, THD 1%)

70 W + 70 W

Surround mode

2)

 (reference) (6 ohms, 1 kHz,

THD 10%)

RMS output

FRONT: 

100 W per channel

Surround mode

2)

 (reference) (10 ohms, 100 Hz,

THD 10%)
SUBWOOFER: 

60 W per channel

1)

 Measured under the following conditions:

SA

230 V AC, 50 Hz

2)

 Reference power output for front speakers and 

subwoofer. Depending on the sound field set-
tings and the source, there may be no sound 
output.

Inputs
 Analog 

Sensitivity: 

1 

V/

50 kohms

  Digital (Coaxial) 

Impedance: 75 ohms

Tone
  Gain levels 

±6 dB, 1 dB step

Reproduction frequency range:
   

28 – 20,000 Hz

AM tuner section
Tuning range

10 kHz step

9 kHz step

SA

530 kHz –
1,610 kHz

531 kHz –
1,602 kHz

Antenna Loop 

antenna

Intermediate frequency
  

450 

kHz

Tuning range 

87.5 - 108.0 MHz

Antenna FM 

wire 

antenna

Antenna terminals 

75 ohms, unbalanced

Intermediate frequency
 10.7 

MHz

General
Power requirements

SA

230 – 240 V AC, 50/60 Hz

Power consumption

SA

220 W

Power consumption (during standby mode)
  0.3 

W

Dimensions (width/height/depth) (Approx.)
 

 

430 × 145 × 306 mm   

 

 

including projecting parts  

  and 

controls

Mass (Approx.) 

7.6 kg

  .............................................   2

  ..................................................................   3

3-1.   Disassembly Flow  ..........................................................   8
3-2.   Case .................................................................................   8
3-3.   Back Panel Block ............................................................   9
3-4.   Front Panel Block  ..........................................................   9
3-5.   Main Block .....................................................................   10
3-6.   MAIN Board ...................................................................   10

TEST  MODE 

 ............................................................   11

ELECTRICAL  CHECK 

 .........................................   12

6-1.  Block Diagram - MAIN Section - ...................................   13
6-2.  Block Diagram - AMP Section - .....................................   14
6-3.  Block Diagram - POWER SUPPLY Section - ................   15
6-4.  Printed Wiring Board - MAIN Board - ...........................   17
6-5.  Schematic Diagram - MAIN Board (1/4) - .....................   18
6-6.  Schematic Diagram - MAIN Board (2/4) - .....................   19
6-7.  Schematic Diagram - MAIN Board (3/4) - .....................   20
6-8.  Schematic Diagram - MAIN Board (4/4) - .....................   21
6-9. Printed 

Wiring 

Board 

 

- DIGITAL AB Board (Side A) - ....................................   22

6-10. Printed Wiring Board 
 

- DIGITAL AB Board (Side B) - ....................................   23

6-11.  Schematic Diagram - DIGITAL AB Board (1/3) -..........   24
6-12.  Schematic Diagram - DIGITAL AB Board (2/3) -..........   25
6-13.  Schematic Diagram - DIGITAL AB Board (3/3) -..........   26
6-14. Printed Wiring Boards 
 

- HEADPHONE/DCAC/POWER Section - ...................   27

6-15.  Schematic Diagram - HEADPHONE/DCAC/POWER 

Section - ..........................................................................   27

6-16.  Printed Wiring Board - DISPLAY Board  .......................   28
6-17.  Schematic Diagram - DISPLAY Board - ........................   29
6-18.  Printed Wiring Board - STANDBY Board - ...................   30
6-19.  Schematic Diagram - STANDBY Board - ......................   31
6-20. Printed Wiring Board 
 

- DCDC CONVERTER Board - .....................................   32

6-21. Schematic Diagram 
 

- DCDC CONVERTER Board - .....................................   32

7-1.  Front Panel Section .........................................................   42
7-2.  Back Panel Section .........................................................   43
7-3. Main 

Section 

...................................................................  44

  ..............................   45

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 

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)

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 viscou-s (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  IC1131  ON  THE  DIGITAL  
AB  BOARD
IC1131 on the DIGITAL AB board cannot exchange with single. 
When IC1131 on the DIGITAL AB board is damaged, exchange 
the entire mounted board.

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.

 

RB 

"  /

Press to turn the receiver on or
off (page 19, 24, 25, 31, 36).

# TUNING

Press to operate the tuner

(FM/AM) (page 31).

$ Display

The current status of the
selected component or a list of
selectable items appears here
(page 5).

% DISPLAY

Press to select information
displayed on the display

(page 35).

& INPUT MODE Press to select the input mode

when the same components are
connected to both digital and
analog jacks (page 34).

' MASTER

Turn to adjust the volume level
of all speakers at the same time
(page 21, 22, 24, 25).

( INPUT

Turn to select the input source
to play back (page 22, 24, 25,
34).

) Remote

Receives signals from remote
commander.

* A.F.D.

Press to select a sound field
(page 29)

+ VIDEO IN/

Connects to a portable audio
such as MP3 player, etc.

(page 14).

, PHONES jack Connects to headphones

(page 40).

This section is extracted 
from instruction manual.

, Playback

The letters (L, C, R, etc.)
indicate the channels being
played back. The boxes around
L and R show the receiver
downmixes the source sound to
2 channels.

Front Left
Front Right
Center (monaural)
Surround Left
Surround Right
Example:
Recording format (Front/
Surround): 3/2.1
Sound Field: A.F.D. AUTO

B

R

" SW

Lights up when the audio signal
is output from the
SUBWOOFER jack.

# LFE

Lights up when the disc being
played back contains an LFE
(Low Frequency Effect)
channel and the LFE channel
signal is actually being
reproduced.

$ D

Lights up when the receiver is
decoding Dolby Digital signals.
Note
When playing a Dolby Digital
format disc, be sure that you
have made digital connections
and that INPUT MODE is set to
“AUTO” (page 34).

% OPT

Lights up when INPUT MODE
is set to “AUTO” and the source
signal is a digital signal being
input through the OPTICAL
jack.

& DTS

Lights up when the receiver is
decoding DTS signals.
Note
When playing a DTS format
disc, be sure that you have made
digital connections and that
INPUT MODE is set to
“AUTO” (page 34).

' MEMORY

Lights up when a memory
function, such as Preset
Memory (page 33), etc., is
activated.

( Tuner

Lights up when using the
receiver to tune in radio stations
(page 31), etc.

) Preset

Lights up when using the
receiver to tune in preset radio
stations. For details on
presetting radio stations, see
page 33.

* D.RANGE

Lights up when dynamic range
compression is activated.

+ COAX

Lights up when DVD/BD input
is selected. However, “NO
INPUT” appears on the display
if no digital signal is input
through the COAXIAL jack.