Read Sony SA-WNT3 Service Manual online
SA-WNT3
4
SECTION 1
SERVICING NOTES
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
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
• 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.
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
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.
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.
also be added to ordinary solder.
ADVANCE PREPARATION WHEN CONFIRMING OP-
ERATION
All of the units included in the HT-NT3 (SA-WNT3/SA-NT3) are
required to confi rming operation of SA-WNT3. Check in advance
that you have all of the units.
ERATION
All of the units included in the HT-NT3 (SA-WNT3/SA-NT3) are
required to confi rming operation of SA-WNT3. Check in advance
that you have all of the units.
NOTE OF PERFORMING THE OPERATION CHECK IN
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
NOTE OF REPLACING THE IC7400 ON THE SUB
MAIN BOARD
IC7400 on the SUB MAIN board cannot replace with single. When
this part is damaged, replace the complete mounted board.
MAIN BOARD
IC7400 on the SUB MAIN board cannot replace with single. When
this part is damaged, replace the complete mounted board.
“PRTECT (PROTECT)” APPEARS ON THE DISPLAY OF
THE BAR SPEAKER (SA-NT3)
THE BAR SPEAKER (SA-NT3)
q Press the ÒÄÆ (on/standby) button to turn off the system. After the
indicator disappears, disconnect the AC power cord (mains lead)
then check that nothing is blocking the ventilation holes of the
system.
then check that nothing is blocking the ventilation holes of the
system.
NOTE OF REPLACING THE IC7203 ON THE SUB
MAIN BOARD AND THE COMPLETE SUB MAIN
MAIN BOARD AND THE COMPLETE SUB MAIN
BOARD
When IC7203 on the SUB MAIN board and the complete SUB
MAIN board are replaced, it is necessary to spread the compound
between the SUB MAIN board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
When IC7203 on the SUB MAIN board and the complete SUB
MAIN board are replaced, it is necessary to spread the compound
between the SUB MAIN board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
– SUB MAIN Board (Component Side) –
IC7203
thermal compound (G747)
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C201 or
C207) to discharge the capacitor (C201 or C207).
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C201 or
C207) to discharge the capacitor (C201 or C207).
– SWITCHING REGULATOR (3L405W) Board
(Conductor Side) –
(Conductor Side) –
C207
C201
800
:/2 W
800
:/2 W
BOND FIXATION OF ELECTRIC PARTS
When SWITCHING REGULATOR (3L405W) board or SUB
MAIN board is replaced or the following object parts are replaced,
it is necessary to fi x parts to the boards by using a specifi ed bond
without fail.
When SWITCHING REGULATOR (3L405W) board or SUB
MAIN board is replaced or the following object parts are replaced,
it is necessary to fi x parts to the boards by using a specifi ed bond
without fail.
• Object boards
SWITCHING REGULATOR (3L405W) board
Complete SUB MAIN board
SWITCHING REGULATOR (3L405W) board
Complete SUB MAIN board
• Object parts
Board
Ref. No.
SWITCHING
REGULATOR
(3L405W)
REGULATOR
(3L405W)
C101, C102, C103, C201, C207, C211,
C402, C408, C461, C465, L101, L102,
L401, NR101, R208, T201
C402, C408, C461, C465, L101, L102,
L401, NR101, R208, T201
SUB MAIN
C7230, C7233, C7234, L7202
• Use bond
Part No.
Description
7-600-020-70
ADHESIVE (SC608Z2) 180ML
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