CMT-DH888BT, HCD-DH888BT - Sony Audio Service Manual (repair manual). Page 4

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.