SONY ICDB25
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 damaged by heat.

TABLE OF CONTENTS 1. GENERAL
Index to Parts and Controls ..................................................... 3

�

UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the leadfree 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.)

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

: 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.

4. EXPLODED VIEWS
4-1. Case Section ...................................................................... 21 4-2. Main Board Section .......................................................... 22

5. ELECTRICAL PARTS LIST ........................................ 23

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 � LA S�CURIT�!! LES COMPOSANTS IDENTIFI�S PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCH�MATIQUES ET LA LISTE DES PI�CES SONT CRITIQUES POUR LA S�CURIT� DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PI�CES SONY DONT LES NUM�ROS SONT DONN�S DANS CE MANUEL OU DANS LES SUPPL�MENTS PUBLI�S PAR SONY.

2