Sharp CD-C449W User Manual

– 1 –
CD-C449W/K449W
KARAOKE CIRCUIT
No.S8875CDC449W/
CONTENTS
Page
SAFETY PRECAUTION FOR SERVICE MANUAL ........................................................................................................... 2
SPECIFICATIONS ............................................................................................................................................................. 3
VOLTAGE SELECTION ......................................................................................................................................................3
NAMES OF PARTS ........................................................................................................................................................... 4
OPERATION MANUAL ...................................................................................................................................................... 7
DISASSEMBLY.................................................................................................................................................................. 9
REMOVING AND REINSTALLING THE MAIN PARTS ................................................................................................... 12
ADJUSTMENT ................................................................................................................................................................. 13
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 17
TYPES OF TRANSISTOR AND LED................................................................................................................................17
WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 18
BLOCK DIAGRAM ........................................................................................................................................................... 19
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD............................................................................................. 22
TROUBLESHOOTING ..................................................................................................................................................... 46
FUNCTION TABLE OF IC................................................................................................................................................ 50
FL DISPLAY ..................................................................................................................................................................... 57
REPLACEMENT PARTS LIST/EXPLODED VIEW
CD-C449W
CD-K449W
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified be
used.
SERVICE MANUAL
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
SHARP CORPORATION
● SRS, the SRS Logo (●) and the Sound Retrieval System
are registered trademarks of SRS Labs, Inc. in the United
States.
CD-K449W
SECTION
CD-C449W
CD-C449W mini component system consisting of
CD-C449W mini component system and
CP-C449 speaker system.
CD-K449W mini component system consisting of
CD-K449W mini component system and
CP-C449 speaker system.

Sharp CD-C449W Specifications

General

Type	Stereo System
Tuner	AM/FM
Bluetooth	No
USB Port	No
Remote Control	Yes
Power Output	20W
Disc Playback	CD, CD-R, CD-RW
Speakers	2-Way Speakers
Weight	2.8 kg
CD Changer	5-disc changer

Summary

SAFETY PRECAUTIONS

Service Safety Warnings

Essential safety guidelines for servicing laser components and general handling.

SYSTEM OVERVIEW AND SPECIFICATIONS

Specifications and Part Identification

Overall system specs and identification of front, rear, and remote parts.

OPERATION, MAINTENANCE, AND ADJUSTMENT

Clock Setting Procedure

Procedure for setting the unit's internal clock.

Disassembly and Reassembly

Important notes for safe disassembly and step-by-step procedures.

Part Removal and Adjustments

Guide for removing key components and performing adjustments.

Test Mode Procedures

Procedures for entering and operating specific test modes for system functions.

TECHNICAL REFERENCE AND DIAGNOSTICS

Adjustment Procedures

Procedures for adjusting mechanism, tuner, and test modes.

Waveforms and Signal Analysis

Visual representation of CD circuit signals for diagnostics.

Block and Schematic Diagrams

Overview of system signal flow and detailed circuit schematics.

PWB Wiring Layouts

Visual guide to component placement and connections on PCBs.

IC Function Tables and FL Display

Pinouts, functions of ICs, and FL display segment control.

TROUBLESHOOTING

CD Section Troubleshooting

Diagnosing and resolving issues related to CD playback and mechanism.

Spin and Servo System Troubleshooting

Resolving problems with turntable spin, focus, and tracking.