XDR-S50 - Sony Audio Service Manual (repair manual). Page 2

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2
XDR-S50
TABLE OF CONTENTS
1.
GENERAL
Location of Controls ........................................................
3
2.
DISASSEMBLY
2-1.
Cabinet (Rear) Assy .........................................................
4
2-2.
Chassis Section ................................................................
5
2-3.
Main Board, TU1 ............................................................
5
2-4.
Key Board, Micro Computer Board Sub Assy ................
6
3.
DIAGRAMS
3-1.
Block Diagram ................................................................
7
3-2.
Circuit Boards Location ..................................................
8
3-3.
Printed Wiring Boards –Main Section– ...........................
9
3-4.
Printed Wiring Boards –Micon Section– ......................... 10
3-5.
Schematic Diagram ......................................................... 11
4.
EXPLODED VIEWS
4-1.
Rear Cabinet Section ....................................................... 15
4-2.
Cabinet (Front) Section ................................................... 16
4-3.
Boards Section ................................................................. 17
5.
ELECTRICAL PARTS LIST
.................................. 18
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  
0
  OR  DOTTED  LINE
WITH  MARK  
0
  ON  THE  SCHEMATIC  DIAGRAMS  AND  IN
THE  PARTS  LIST  ARE  CRITICAL  TO  SAFE  OPERATION.
REPLACE  THESE  COMPONENTS  WITH  SONY  PARTS
WHOSE  PART  NUMBERS  APPEAR  AS  SHOWN  IN  THIS
MANUAL  OR  IN  SUPPLEMENTS  PUBLISHED  BY  SONY.
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 flow)
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.
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged
by heat.
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