Sony HT-S350 Service Manual page 51

SA-WS350/WSD35
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 due to their particular size)
: 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.
ADVANCE PREPARATION WHEN CONFIRMING OPER-
ATION
All of the units included in the HT-S350 (SA-S350/SA-WS350/Re-
mote control) or HT-SD35 (SA-SD35/SA-WSD35/Remote control)
are required to confi rming operation of this unit. Check in advance
that you have all of the units.
DISCHARGE PROCESSING
Before checking the operation of the boards for the electric shock
prevention, perform the discharge processing by connecting the re-
sistor at both ends of the specifi 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) –
ABOUT THE PROTECTION
If the status indicator on the subwoofer fl ashes in red, press the [ 1 ]
button of the subwoofer to turn the power off and check whether the
ventilation holes of the subwoofer is not blocked, leave it for a while
and turn the power on again.
4
SECTION 1
SERVICING NOTES
NOTE OF PERFORMING THE OPERATION CHECK IN
THE STATE THAT HEAT SINK 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 heat sink is removed from the MAIN board.
However, in that case, volume setting to low and work in a short
time of about several minutes.
If you need more than volume setting to medium, or more than a
few minutes of work, be sure to work with attach the heat sink to
the MAIN board.
800 /2 W
(for C3)
– MAIN Board (Side A) –
heat sink
Sony CONFIDENTIAL
For Authorized Servicer
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