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Sony CDX-4250 User Manual

Sony CDX-4250
44 pages
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Model Name Using Similar Mechanism CDX-4180
CD Drive Mechanism Type MG-363X-121
Optical Pick-up Name KSS-521A
SERVICE MANUAL
US Model
Canadian Model
CDX-4250
E Model
CDX-4500
CDX-4250/4500
FM/AM COMPACT DISC PLAYER
MICROFILM
SPECIFICATIONS
Photo: CDX-4250
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Sony CDX-4250 Specifications

General IconGeneral
Preset Stations30
RMS Power Output17 Watts x 4 Channels
CD PlayerYes
CD-R/RW PlaybackYes
MP3 PlaybackYes
WMA PlaybackYes
Display TypeLCD
Detachable FaceplateYes
Remote ControlYes
AUX InputYes
USB PortNo
BluetoothNo
iPod CompatibilityNo
Channels4
Tuner BandsAM, FM

Summary

Specifications Overview

Audio Power Specifications

Details on power output and total harmonic distortion for the unit.

Other Specifications

Technical details for CD player, tuner, and power amplifier sections.

General Specifications

Model name, power requirements, dimensions, and supplied accessories.

Service Notes and Precautions

Handling Precautions

Guidelines for handling optical pick-ups, laser diodes, and flexible boards.

Safety Warnings

Critical component replacement and safety-related component warnings.

General Information and Operation

Location of Controls

Identification of unit controls and display elements.

Getting Started and Panel Handling

Initial setup, unit reset, and front panel detachment/attachment procedures.

CD and Radio Operations

Setting the Clock

Procedure for setting the 12-hour digital clock.

CD Playback Operations

Instructions for listening to CDs, track locating, and playback modes.

Radio Operations

Procedures for memorizing and tuning radio stations.

Sound Adjustments and Features

Sound Characteristics Adjustment

Adjusting bass, treble, balance, fader, and sound characteristics.

D-Bass and Sound Enhancement

Using the D-Bass feature for boosted bass and controlling beep sounds.

Additional Information and Maintenance

General Precautions

Important notes on operating conditions, connections, and dealer consultation.

Maintenance and Dismounting

Guidance on fuse replacement, connector cleaning, and unit removal.

Connections and Wiring

Connection Caution and Setup

Important safety, accessory position, and reset guidelines for unit connection.

Connection Diagram

Visual guide for connecting the unit to car power and speakers.

Disassembly Procedures

Cover and Front Panel Disassembly

Steps to remove the unit's cover and front panel assemblies.

CD Mechanism and Display Disassembly

Display Board Disassembly

Procedure for removing the display board.

CD Mechanism Block Disassembly

Steps to remove the CD mechanism block.

Main Board and Heat Sink Disassembly

Main Board and Heat Sink Disassembly

Procedures for removing the main board and heat sink.

Chassis and Lever Assemblies Disassembly

Chassis (T) Sub Assy Disassembly

Procedure for removing the chassis (T) sub assembly.

Lever Assy Disassembly

Steps to detach the lever assembly components.

Servo and Roller Assembly Disassembly

Servo Board Disassembly

Procedure for removing the servo board.

Roller Assembly Disassembly

Steps to detach the roller assembly.

Optical Pick-up Block Disassembly

Chassis (OP)/(O/S) Assy Disassembly

Procedure for removing chassis (OP)/(O/S) assembly.

Optical Pick-up Block Disassembly

Steps to detach the optical pick-up block.

Electrical Adjustments

Tuner Section Adjustments

Procedures for adjusting FM/AM tuner sensitivity and center frequency.

FM/AM Specific Adjustments

Detailed steps for FM center, SENS/IF, and AM sensitivity.

CD Section Adjustments

Focus Bias Adjustment

Procedure to adjust focus bias on the servo board for clear waveforms.

Focus Gain Adjustment

Coarse adjustment for optical pick-up gain.

Diagrams and Schematics

IC Pin Descriptions

Detailed pinout information for IC801 (System Control).

Circuit Board Layouts and Waveforms

Circuit Boards Location

Diagram showing the layout of internal circuit boards.

Waveforms

Illustrations of signal waveforms for key test points.

CD Mechanism Printed Wiring Boards

Servo Board and Pick-up Flexible Board

Printed wiring diagrams for servo and pick-up flexible boards.

CD Mechanism Schematic Diagrams

CD Mechanism Schematic

Detailed schematic diagram for the CD mechanism section.

Display Section Printed Wiring Boards

Display Board Sides A & B

Printed wiring diagrams for the display board, sides A and B.

Display Section Schematic Diagrams

Display Board Schematic

Detailed schematic diagram for the display section.

Main Section Printed Wiring Boards

Main Board Wiring Diagram

Printed wiring diagram for the main board.

Main Section Schematic Diagrams

Main Section Schematic (1/2)

Detailed schematic diagram for the main section, part 1.

IC Block Diagrams

IC Block Diagrams

Block diagrams illustrating the internal functions of key ICs.

Exploded Views

Chassis Section

Exploded view of the chassis assembly and related parts.

Front Panel Exploded View

Front Panel Section

Exploded view of the front panel assembly and its components.

CD Mechanism Exploded Views (Part 1)

CD Mechanism Section (1)

Exploded view of the CD mechanism assembly, part 1.

CD Mechanism Exploded Views (Part 2)

CD Mechanism Section (2)

Exploded view of the CD mechanism assembly, part 2.

CD Mechanism Exploded Views (Part 3)

CD Mechanism Section (3)

Exploded view of the CD mechanism assembly, part 3.

Electrical Parts List

Disc-in, Display, and Semiconductor Parts

Lists of parts for disc-in, display boards, and semiconductors.

Electrical Parts List (Continued)

Capacitors and Resistors Lists

Lists of capacitors and resistors used in the unit.

Electrical Parts List (Continued)

Tuner, Connector, IC, and Vibrator Parts

Lists of tuner, connector, IC, and vibrator components.

Electrical Parts List (Continued)

Servo Board, Miscellaneous, and Accessories

Lists of servo board parts, miscellaneous items, and accessories.

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