HBD-TZ145 - Sony Audio Service Manual (repair manual). Page 3

The laser diode in the optical pick-up block may suffer electro-
static 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.

ABOUT  PART  REPAIR  OF  EACH  BOARD
When boards installed by this unit are defective, replace the com-
plete board. However, some of mounted parts are replaceable. Re-
fer to “5. ELECTRICAL PARTS LIST” (page 40) for parts that 
can be replaceable.

RELEASING  THE  DISC  TRAY  LOCK
The disc tray lock function for the antitheft of an demonstration 
disc in the store is equipped.
Setting Procedure:
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [FUNCTION] button to select “DVD/CD”.
3. Insert 

disc.

4. Press the [

x

] and [

Z

] buttons simultaneously and hold down 

unit “LOCKED” displayed on the fluorescent indicator tube 
(around 5 seconds).

Releasing Procedure:
1.  Press the [

?/1

] button to turn on the system.

2.  Press the [FUNCTION] button to select “DVD/CD”.
3. Press the [

x

] and [

Z

] buttons simultaneously and hold down 

unit “UNLOCKED” displayed on the fluorescent indicator 
tube (around 5 seconds).

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

turning power on/off with the [?/1] button.

VERSION  DISPLAY
Confi rmation procedure of version only:
1.  Connect this unit with TV monitor.
2.  Press the [

?/1

] button to turn on the system.

3.  Press the [

Z

] button.

 

(State of “Tray open”)

3.  After press the [

x

] button, press the [ DISPLAY] button on 

the remote commander.

4.  The version information appears to the TV monitor.
 

(Displayed character/values are example)

 

Model NO.

Release:  2012.03.29A
MPEG: 3.22.24

Region:      0

MCU:   3.25.26

HdcpKey:   Yes

DAV-TZ145 E12

OK

Releasing Procedure:
1.  Press the [ ] button on the remote commander.
2.  The system will return to normal mode.

LASER  DIODE  AND  FOCUS  SEARCH
Procedure:
1.  Open the case and turn POWER on with no disc inserted.
2. Confi rm that the following operation is performed while ob-

serving the objecting lens from the clearance of DVD mecha-
nism deck.

 Confi rm that laser beam is spread.

 Up and down motion of the objective lens. (2 times)

ON  CLEANING  DISCS,  DISC/LENS  CLEANERS
Do not use cleaning discs or disc/lens cleaners (including wet or 
spray types). These may cause the apparatus to malfunction.

IMPORTANT  NOTICE
Caution: This system is capable of holding a still video image or on-
screen display image on your television screen indefi nitely. If you leave 
the still video image or on-screen display image displayed on your TV 
for an extended period of time you risk permanent damage to your tele-
vision screen.
Projection televisions are especially susceptible to this.

ABOUT  “PROTECT”  DISPLAY
If any one of the speakers is not connected, “PROTECT” may be 
displayed. This is a specifi cation of this unit. When performing an 
inspection for which disc playback is necessary, connect all of the 
speakers.