D-F21, D-F22ST, ICD-BP220 - Sony Audio Service Manual (repair manual). Page 2

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Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270°C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

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.

................................................................. 3

Getting started ......................................................................... 4

3-1.   “Lid, Battery Case”, Cabinet (Front) Assy .......................... 5
3-2.   Lid Assy, Upper ................................................................... 5
3-3.   Main Board, MD Assy ........................................................ 6
3-4.   Optical Pick-up, Motor ....................................................... 6

Tuner Section ........................................................................... 7
CD Section .............................................................................. 8

5-1.   IC Pin Descriptions ............................................................. 9
5-2.   Block Diagram –CD Section– ........................................... 13
5-3.   Block Diagram –Tuner Section– ....................................... 14
5-4.   Block Diagram –Power Supply Section– .......................... 15
5-5.   Printed Wiring Board –Main Section– .............................. 16
5-6.   Schematic Diagram –Main Section (1/3)– ......................... 18
5-7.   Schematic Diagram –Main Section (2/3)– ......................... 19
5-8.   Schematic Diagram –Main Section (3/3)– ......................... 20
5-9.   IC Block Diagrams ............................................................ 21

6-1.   Cabinet (Front) Section ..................................................... 24
6-2.   Cabinet (Lower) Section ................................................... 25
6-3.   CD Mechanism Deck Section (CDM-3123EBA) ............. 26

......................................... 27

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.