HT-S20R
4
Sony CONFIDENTIAL
For Authorized Servicer
SECTION 1
SERVICING NOTES
The SERVICING NOTES contains important information for servicing. Be sure to read this section before repairing the unit.
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)
: LEAD FREE MARK
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.
NOTE OF REPLACING THE FUSE
The fuse is or could be in the neutral. When a fuse is being replaced,
the main plug shall be disconnected from the AC outlet to prevent
electric shock.
ADVANCE PREPARATION WHEN CONFIRMING OPER-
ATION
All of the units included in the HT-S20R (SA-WS20R/SS-S20R/
SS20R/Remote control) are required to con
fi
rming operation of this
unit. Check in advance that you have all of the units and accessories.
DISCHARGE PROCESSING METHOD
When disassembling the SA-WA20R (active subwoofer) after check-
ing the operation of this unit, for the electric shock prevention, per-
form the discharge processing by connecting the resistor at both ends
of the speci
fi
ed capacitor with referring to the
fi
gure below.
Note:
Be sure to discharge using a resistor of 800
or higher.
– POWER Board (Conductor Side) –
800
:
/2 W
(for C904)
800
:
/2 W
(for C931)
800
:
/2 W
(for C933)
ABOUT THE PROTECTION
[PROTECT] appears in the front panel
display of the subwoofer, the sound is
muted, and buttons on the remote control
or subwoofer other than
Æ
(power) do not
work.
• The protection feature is activated.
Press
Æ
(power) to turn the system off and
disconnect the AC power cord (mains lead) and
check the items below.
— Make sure that the ventilations of the
subwoofer are not covered and turn on the
system after a while.
— When the system is using the USB connection,
remove the USB device and turn on the
system. If the system operates properly, the
current of the connected USB device is over
the maximum output current of the system
500 mA, or the USB device may have an
abnormality.
NOTE OF PERFORMING THE OPERATION CHECK IN THE
STATE THAT HEATSINK IS REMOVED
When performing the operation check in the state that this unit is
disassembled, it is possible to perform the operation check in the
state that heatsink is removed from MAIN board. However, in that
case, set the volume to low level and perform the work in the short
time so as a few minutes.
When it is necessary to work in the middle level volume or more or
a few minutes or more, be sure to perform in the state that heatsink
is installed to the MAIN board.
– MAIN Board (Component Side) –
heatsink
RESET METHOD
1
Press MENU to turn on the menu in the front
panel display.
2
Press
j
/
to select [RESET], then press ENTER.
3
Press
j
/
to select [ALL RESET], then press
ENTER.
4
Press
j
/
to select [START], then press ENTER.
All the settings return to their initial status.
To cancel resetting
Select [CANCEL] in step 4.
Ver. 1.1
SYS SET
2021/02/10 22:25:21 (GMT+09:00)
