NAS-S55HDE, NAS-SC55PKE, SS-S55HDE - 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 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.

Because of its high storage density, the hard disk can read and
write data a very high speeds.
It is, however, easily damaged by mechanical vibration, shock, or
dust. Although the hard disk is equipped with safety mechanisms
to prevent the lost of data due to these factors, the following
precautions should be taken during the handling of the  unit.
• Do not subject the  unit to strong shocks or vibrations.

• Do not place the unit in a location subject to mechanical

vibration or at an unstable location.

• Do not move the unit while the power cord is connected to a 

wall outlet.

• Do not disconnect the power cord while the unit is recording or

playing a track.

• Do not use the unit in a place subject to extreme changes in 

temperature (a temperature gradient greater than 18°F (10°C)/
hour).

• Do not attempt to replace or upgrade the hard disk drive by

yourself, as this may cause the unit to malfunction.

Sony cannot provide compensation for any loss of data caused by a 
damaged hard disk drive.

Audio data and system settings stored on the unit’s hard disk may
be lost during repairs done to the unit. Before taking the unit in for 
repairs, it is recommended that you record the settings on a piece
of paper and that you use the Back Up function to back up the data 
to a shared folder on your computer or a USB hard disk drive (see
“Backing up and restoring audio data” on page 104).
Data on the unit’s HDD is subject to damage during normal
operations. To prevent the loss of data, you should back up the data 
on a regular basis. Please note that we cannot take responsibility
for any data that may be lost or
repairs.

detergent solution. Do not use any type of abrasive pad, scouring
powder, or solvent, such as thinner, benzine, or alcohol.

Before you unplug the power cord from the wall outlet, make sure
that the unit is in standby mode (the On/Standby indicator is lit up 
red or orange). If you unplug the power cord while the unit is
operating (the On/Standby indicator lit up green), data that was
recorded may be lost or the unit may malfunction.

slightly moistened with a mild

NOTE  THE  CN400  ON  THE  DAB  PS  BOARD  RE-
PLACING
CN400 on the DAB PS board cannot exchange with single. When 
CN400 on the DAB PS board is damaged, exchange the entire 
mounted board.

NOTE  THE  CN5002,  IC501,  IC1001,  IC1002,  IC2001,  
IC2101,  IC5001,  IC9101,  IC9201,  IC9301  AND  IC9401  
ON  THE  MOTHER  BOARD  REPLACING
CN5002, IC501, IC1001, IC1002, IC2001, IC2101, IC5001, 
IC9101, IC9201, IC9301 and IC9401 on the MOTHER board can-
not exchange with single. When CN5002, IC501, IC1001, IC1002, 
IC2001, IC2101, IC5001, IC9101, IC9201, IC9301 and IC9401 on 
the MOTHER board are damaged, exchange the entire mounted 
board.