Table Of Contents - Sony ICD-B25 Service Manual

ICD-B25
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
•
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.
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.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.
2

TABLE OF CONTENTS

1. GENERAL
Index to Parts and Controls ..................................................... 3
2. DISASSEMBLY
2-1. Upper Lid Sub Block Assy .................................................. 4
2-2. F-sw Board .......................................................................... 4
2-3. Main Board ......................................................................... 5
3. DIAGRAMS
3-1. IC Pin Description ............................................................... 6
3-2. Block Diagram .................................................................... 8
3-3. Printed Wiring Board - Main Section - ............................ 10
3-4. Schematic Diagram - Main Section (1/3) - ...................... 12
3-5. Schematic Diagram - Main Section (2/3) - ...................... 13
3-6. Schematic Diagram - Main Section (3/3) - ...................... 14
3-7. Schematic Diagram - F-sw Section - ............................... 15
3-8. Printed Wiring Board - F-sw Section - ............................ 16
3-9. Printed Wiring Board - P-sw Section - ............................ 18
3-10. Schematic Diagram - P-sw Section - ............................... 19
4. EXPLODED VIEWS
4-1. Case Section ...................................................................... 21
4-2. Main Board Section .......................................................... 22
5. ELECTRICAL PARTS LIST
........................................ 23