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SA-WRT5
3
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.
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.
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of capacitors to discharge the capaci-
tor as shown in the fi gure below.
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of capacitors to discharge the capaci-
tor as shown in the fi gure below.
– SWITCHING REGULATOR (3L405W)
(Conductor Side) –
(Conductor Side) –
C207
C201
800
:/2 W
800
:/2 W
1.
SERVICING NOTES
.............................................
3
2. DISASSEMBLY
2-1. Disassembly
Flow
........................................................... 6
2-2. Rear Panel Block ............................................................ 6
2-3. SUB KEY Board, RF Modulator (WS001) (RF1),
2-3. SUB KEY Board, RF Modulator (WS001) (RF1),
AMP Block ..................................................................... 7
2-4. SUB MAIN Board, Power Cord (AC1),
Switching Regulator (3L405W) (SWR1) ....................... 8
2-5. Front Panel Block ........................................................... 9
2-6. SUB LED Board, Grille Frame Assy, Front Panel.......... 10
2-7. Loudspeaker (160 mm)-130-11 (SP1) ............................ 11
2-6. SUB LED Board, Grille Frame Assy, Front Panel.......... 10
2-7. Loudspeaker (160 mm)-130-11 (SP1) ............................ 11
3. TROUBLESHOOTING
.......................................... 12
4. DIAGRAMS
4-1. Printed Wiring Board - MAIN Section - ......................... 14
4-2. Schematic Diagram - MAIN Section (1/3) - ................... 15
4-3. Schematic Diagram - MAIN Section (2/3) - ................... 16
4-4. Schematic Diagram - MAIN Section (3/3) - ................... 17
4-5. Printed Wiring Board - SUB LED Board - ..................... 18
4-6. Schematic Diagram - SUB LED Board - ........................ 18
4-2. Schematic Diagram - MAIN Section (1/3) - ................... 15
4-3. Schematic Diagram - MAIN Section (2/3) - ................... 16
4-4. Schematic Diagram - MAIN Section (3/3) - ................... 17
4-5. Printed Wiring Board - SUB LED Board - ..................... 18
4-6. Schematic Diagram - SUB LED Board - ........................ 18
5.
EXPLODED VIEWS
5-1. Overall
Section
............................................................... 20
5-2. Sub Main Section ............................................................ 21
5-3. Speaker Cabinet Section ................................................. 22
5-3. Speaker Cabinet Section ................................................. 22
6.
ELECTRICAL PARTS LIST
.............................. 23
TABLE OF CONTENTS
The SERVICING NOTES contains important information for
servicing. Be sure to read this section before repairing the
unit.
servicing. Be sure to read this section before repairing the
unit.
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