CMT-DH888BT, HCD-DH888BT - Sony Audio Service Manual (repair manual)

2008K05-1

© 

2008.11

Model Name Using Similar Mechanism

HCD-DH5BT

DVD Mechanism Type

CDM86-DVBU101

Optical Pick-up Block Name

KHM-313CAB

•  HCD-DH888BT is the amplifi er, Bluetooth, USB, 

disc player and tuner section in CMT-DH888BT.

• This system incorporates Dolby*

Digital and the DTS** Digital
Surround System.

* Manufactured under license from Dolby

Laboratories.
“Dolby” and the double-D symbol are
trademarks of Dolby Laboratories.

** “DTS” is a registered trademark of DTS,

Inc. and “DTS 2.0 + Digital Out” is a 
trademark of DTS, Inc.

• U.S. and foreign patents licensed from

Dolby Laboratories.

• DivX   is a video file compression

®

technology, developed by DivX, Inc.
DivX, DivX Certified, and associated
logos are trademarks of DivX, Inc. and
are used under license.

•

are owned by the Bluetooth SIG, Inc.

The Bluetooth word mark and logos

and any use of such marks by Sony
Corporation is under license. Other
trademarks and trade names are those
of their respective owners.

• MICROVAULT is a trademark of Sony

Corporation.

• ATRAC, ATRAC3, ATRAC3plus and

their logos are trademarks of Sony
Corporation.

• MPEG Layer-3 audio coding

technology and patents licensed from 
Fraunhofer IIS and Thomson.

DIN power output (rated)

35 W + 35 W (6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference)

45 W + 45 W (6 ohms at 1 kHz, 10% 
THD)

Inputs:
AUDIO IN (stereo mini jack):

Impedance 47 kilohms

MIC (mini jack):

Impedance 10 kilohms

 (USB) port:

Type A, maximum current 500 mA

Outputs:
DIGITAL OUT (square optical connector
jack):

Wavelength 660 nm

VIDEO OUT (phono jack):

1 Vp-p, unbalanced, Sync. negative
load impedance 75 ohms

COMPONENT VIDEO OUT:

Y: 1 Vp-p, 75 ohms
P

B

/C

B

: 0.7 Vp-p, 75 ohms

P

R

/C

R

: 0.7 Vp-p, 75 ohms

S VIDEO OUT (4-pin/mini-DIN jack):

Y: 1 Vp-p, unbalanced, Sync. negative
C: 0.286 Vp-p, load impedance
75 ohms

PHONES (stereo mini jack):

accepts headphones of 8 ohms or
more

Communication system:

Bluetooth Standard version 2.0

Output:

Bluetooth Standard Power Class 2

Frequency band:

2.4 GHz band (2.4000 GHz — 2.4835
GHz)

Modulation method:

Compatible Bluetooth profiles*:

FHSS

A2DP (Advanced Audio Distribution
Profile)
AVRCP (Audio Video Remote
Control Profile)

Supported codecs:

Receive: SBC (Sub Band Codec), MP3
Transmit: SBC (Sub Band Codec)

*

purpose of Bluetooth communication

Bluetooth standard profiles indicate the

between devices.

Supported bit rate:

MP3 (MPEG 1 Audio Layer-3):
32 — 320 kbps, VBR
ATRAC: 48 — 352 kbps
(ATRAC3plus), 66/105/132 kbps
(ATRAC3)
WMA: 32 — 192 kbps, VBR
AAC: 48 — 320 kbps

– Continued on next page –

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.

FLEXIBLE  CIRCUIT  BOARD  REPAIRING
• 

Keep the temperature of soldering iron around 270 °C during 
repairing.

• 

Do not touch the soldering iron on the same conductor of the 
circuit board (within 3 times).

• 

Be careful not to apply force on the conductor when soldering 
or unsoldering.

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 

CAUTION
Use of controls or adjustments or performance of procedures 
other than those specifi ed herein may result in hazardous radia-
tion exposure.

This appliance is classified as a CLASS 1 
LASER product. This marking is located 
on the rear exterior.

Sampling frequencies:

MP3 (MPEG 1 Audio Layer-3):
32/44.1/48 kHz
ATRAC: 44.1 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz

System:

Compact disc and digital audio and
video system

Laser:
Laser Diode Properties:

Emission duration: continuous
Laser Output*: Less than 1000 μW

*

at a distance of 200

This output is the value measurement

mm from the

objective lens surface on the Optical
Pick-up Block with 7 mm aperture.

Semiconductor laser:

(DVD: λ=650 nm, CD: λ=790 nm)

Video color system format:

NTSC and PAL

FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range:

87.5 — 108.0 MHz (50 kHz step)

Antenna:

FM lead antenna

Antenna terminals:

75 ohms unbalanced

Intermediate frequency:

10.7 MHz

AM tuner section
Tuning range:

530 — 1,710 kHz (with the interval set
at 10 kHz)
531 — 1,602 kHz (with the interval set
at 9 kHz)

Antenna:

AM loop antenna

Antenna terminals:

External antenna terminal

Intermediate frequency:

450 kHz

Power requirements:

220 — 240 V AC, 50/60 Hz

Power consumption:

45 W

Dimensions (w/h/d) (Approx.):

190 × 141 × 273 mm

Mass (Approx.):

2.8 kg

change without notice.

Design and specifications are subject to

(When letters/numbers appear in the
display)
When the self-diagnosis function
is activated to prevent the system
from malfunctioning, a 5-character
service number (e.g. C 13 50) with a 
combination of a letter and 4 digits
appears on the TV screen and the front
panel display. In this case, check the
following table.

C 13

Clean the disc with a

•

C 31

correctly.

Restart the system,

•

then re-insert the
disc correctly.

E XX
(XX is a 
number)

To prevent a 
malfunction, the
system has performed
the self-diagnosis
function.

Contact your nearest

•

Sony dealer or local
authorized Sony
service facility and
give the 5-character
service number.
Example: E 61 10

When you turn on the system, the
version number [VER.X.XX] (X is a 
number) may appear on the TV screen.
Although this is not a malfunction and
for Sony service use only, normal system

the system, and then turn on the system
again to operate.

  .............................................   4

 ..................................................................   6

3-1. Disassembly 

Flow 

...........................................................   8

3-2.  Steel Cabinet (U) ............................................................   8
3-3.  Front Panel Block ...........................................................   9
3-4.  Back Panel Block ............................................................   9
3-5.  Main Chassis Block ........................................................   10
3-6. DMB15 

Board 

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

3-7.  DVD Mechanism Deck (CDM86-DVBU101) ...............   11
3-8. Belt 

(MOT) 

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

3-9.  Optical Pick-Up Block (KHM-313CAB) .......................   12

TEST  MODE 

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

ELECTRICAL  CHECKS 

 ......................................   17

6-1.  Block Diagram  - RF SERVO/VIDEO Section - ............   18
6-2.  Block Diagram  
 

- TUNER/USB/Bluetooth Section - ................................   19

6-3.  Block Diagram  - MAIN Section - ..................................   20
6-4.  Block Diagram  - KARAOKE/AMP Section - ...............   21
6-5.  Block Diagram  
 

- PANEL/POWER SUPPLY Section - ............................   22

6-6.  Printed Wiring Boards  - SERVO Section (1/2) - ...........   24
6-7.  Printed Wiring Board  - SERVO Section (2/2) - .............   25
6-8.  Schematic Diagram  - SERVO Section (1/4) - ................   26
6-9.  Schematic Diagram  - SERVO Section (2/4) - ................   27
6-10.  Schematic Diagram  - SERVO Section (3/4) - ................   28
6-11.  Schematic Diagram  - SERVO Section (4/4) - ................   29

6-12.  Printed Wiring Board  - VIDEO Board - ........................   30
6-13.  Schematic Diagram  - VIDEO Board - ...........................   31
6-14.  Schematic Diagram  - USB Board (1/2) - .......................   32
6-15.  Schematic Diagram  - USB Board (2/2) - .......................   33
6-16.  Printed Wiring Board  - USB Board - .............................   34
6-17.  Printed Wiring Board  - MAIN Board - ..........................   35
6-18.  Schematic Diagram  - MAIN Board (1/2) - ....................   36
6-19.  Schematic Diagram  - MAIN Board (2/2) - ....................   37
6-20.  Printed Wiring Boards  - Bluetooth Section - .................   38
6-21.  Schematic Diagram  - Bluetooth Section - .....................   39
6-22.  Printed Wiring Board  - AMP Board - ............................   40
6-23.  Schematic Diagram  - AMP Board - ...............................   41
6-24.  Printed Wiring Boards  - INPUT/OUTPUT Section - ....   42
6-25.  Schematic Diagram  - INPUT/OUTPUT Section - .........   43
6-26.  Printed Wiring Board  - POWER HT Board - ................   44
6-27.  Schematic Diagram  - POWER HT Board - ...................   45
6-28.  Printed Wiring Boards  - PANEL Section - ....................   46
6-29.  Schematic Diagram  - PANEL Section - .........................   47
6-30.  Printed Wiring Board  - POWER Board - .......................   48
6-31.  Schematic Diagram  - POWER Board - .........................   49

7-1.  Steel Cabinet (U) Section ...............................................   69
7-2.  Front Panel Section .........................................................   70
7-3.  Back Panel Section .........................................................   71
7-4.  DMB15 Board Section ....................................................   72
7-5.  MAIN Board Section ......................................................   73
7-6.  POWER Board Section ...................................................   74
7-7.  DVD Mechanism Deck Section
 (CDM86-DVBU101) 

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

75

  ..............................   76

The laser diode in the optical pick-up block may suffer electrostat-
ic break-down because of the potential difference generated by the 
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also 
use the procedure in the printed matter which is included in the 
repair parts.
The fl exible board is easily damaged and should be handled with 
care.

NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

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 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.

RELEASING  THE  DISC  ANTITHEFT
The disc lock function for the antitheft of an demonstration disc in 
the store is equipped.

Releasing Procedure :
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [DVD 

N

] button to select the “DVD”.

3.  While pressing the [

x

] button, press the [

Z

] button until 

“UNLOCKED” displayed on the fl uorescent indicator tube 
(around 5 seconds).

Note: When “LOCKED” is displayed, the disc lock is not released by 

turning power on/off with the 

[

?/1

]

 button.

NOTE  OF  REPLACING  THE  IC103  ON  THE  DMB15  
BOARD
IC103 on the DMB15 board cannot exchange with single. When 
this part on the DMB15 board is damaged, exchange the entire 
mounted board.

DVD VIDEO

 DVD VIDEO

 DVD-R*/-RW*/+R/+RW

in DVD VIDEO format

* also in video mode

VR mode

 DVD-R/-RW

in VR (Video Recording) mode

VIDEO CD

 VIDEO CD

 Super VCD*

 CD-ROM*/-R*/-RW*

* in VIDEO CD or Super VCD format

CD

 AUDIO CD*

 CD-R*/-RW*

* in AUDIO CD format

DATA CD

 CD-ROM/-R/-RW

in DATA CD format, containing 
MP3 audio tracks

1)

, JPEG image 

files

2)

 or DivX video files

3)

, and 

conforming to ISO 9660

4)

 Level 

1 or Level 2, or Joliet (expansion 
format).

DATA DVD

 DVD-ROM/-R/-RW/+R/+RW

in DATA DVD format containing 
MP3 audio tracks

1)

, JPEG image 

files

2)

 or DivX video files

3)

, and 

conforming to UDF (Universal Disk 
Format).

This system can also play back discs with the following disc logos:

1)

MP3 (MPEG 1 Audio Layer 3) is a standard format defined by ISO/MPEG which compresses audio 
data. MP3 audio tracks must be in MPEG 1 Audio Layer 3 format.

2)

JPEG image files must conform to the DCF image file format. (DCF “Design rule for Camera 
File System”: Image standards for digital cameras regulated by Japan Electronics and Information 
Technology Industries Association (JEITA)).

3)

DivX video files must be recorded in DivX format with the extension “.AVI” or “.DIVX”.

4)

A logical format of files and folders on CD-ROMs, defined by ISO (International Organization for 
Standardization).

“DVD+RW,” “DVD-RW,” “DVD+R,” “DVD VIDEO,” and the “CD” logos are trademarks.