Sharp XL-DK257N

XL-DK257N
– 1
This document has been published to be used for
after sales service only.
The contents are subject to change without notice.
A
U
D
I
O
IN
iPod is a registered trademark of Apple Inc.
PRECAUTIONS FOR USING LEAD-FREE SOLDER
CHAPTER 1. GENERAL DESCRIPTION
[1] Important Service Safety Precaution ................ 1-1
[2] Important Service Notes (for U.S.A only).......... 1-1
[3] Specifications..................................................... 1-2
[4] Name Of Parts ................................................... 1-3
CHAPTER 2. ADJUSTMENTS
[1] CD Section .................................................. 2-1
[2] Test Mode .................................................... 2-2
[3] Standard Specification Of Stereo System
Error Message Display Contents ................. 2-4
CHAPTER 3. MECHANICAL DESCRIPTION
[1] Disassembly ................................................ 3-1
CHAPTER 4. BLOCK DIAGRAM
[1] Block Diagram ............................................. 4-1
CHAPTER 5. CIRCUIT DESCRIPTION
[1] Waveforms Of Servo Circuit ........................ 5-1
[2] IC Voltage .................................................... 5-3
CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] Notes On Schematic Diagram ..................... 6-1
[2] Types Of Transistor And LED ...................... 6-1
[3] Schematic Diagram ..................................... 6-2
[4] Charts Of Connecting Wires ...................... 6-10
[5] Wiring Side of PWB ................................... 6-12
CHAPTER 7. FLOWCHART
[1] Troubleshooting ........................................... 7-1
CHAPTER 8. OTHER
[1] Function Table Of IC .................................... 8-1
[2] FL Display.................................................... 8-9
PARTS GUIDE
SERVICE MANUAL
No. S2807XLDK257N
Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with
specified ones for maintaining the safety and performance of the set.
CONTENTS
!
MICRO COMPONENT SYSTEM
MODEL
XL-DK257N Micro Component System consisting of
XL-DK257N (main unit) and CP-DK257N (speaker system).
XL-DK257N
• In the interests of user-safety (Required by safety regulations in
some countries) the set should be restored to its original condition
and only parts identical to those specified be used.
SHARP CORPORATION

Sharp XL-DK257N Specifications

General

Brand	Sharp
Model	XL-DK257N
Category	Stereo System
Language	English

Summary

PRECAUTIONS FOR USING LEAD-FREE SOLDER

Lead-Free Solder Handling Guidelines

Guidelines for using and soldering with lead-free wire and identifying related symbols.

CHAPTER 1. GENERAL DESCRIPTION

Service Safety and User Notes

Essential safety precautions for service personnel and pre-return safety checks for users.

Product Specifications Overview

Technical specifications for the unit's general, amplifier, CD, tuner, and speaker components.

Parts Identification

Detailed identification of all parts on the front, display, rear panels, and speaker system.

CHAPTER 2. ADJUSTMENTS

CD Section Automatic Adjustments

Details on automatic adjustments for the CD pickup and servo circuits.

Test Mode Operation Procedure

Step-by-step guide to enter and operate the unit's test mode for diagnostics.

Error Message Display Specifications

Lists error contents and their corresponding display messages for CD and Tuner sections.

CHAPTER 3. MECHANICAL DESCRIPTION

Disassembly and Reassembly Instructions

Step-by-step instructions for disassembling the unit, including caution notes.

CHAPTER 4. DIAGRAMS

System Block Diagrams Overview

Overall block diagrams showing major functional units and connections within the system.

CHAPTER 5. CIRCUIT DESCRIPTION

Servo Circuit Waveform Analysis

Visual representations of servo circuit waveforms for troubleshooting and analysis.

IC Voltage Measurement Data

Table listing voltage readings for various IC pins under normal operation.

CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS LAYOUT

Schematic Diagram Conventions

Explanations of symbols used in schematic diagrams for resistors and capacitors.

Transistor and LED Component Identification

Identification and visual representation of various transistors and LEDs used in the circuit.

Main Section Circuit Schematic

Detailed circuit schematics of the main section of the unit.

Wire Connection Diagrams

Diagrams illustrating wire connections between different printed circuit boards.

Main PWB Wiring Layouts

Shows component layouts and wiring on the top and bottom sides of the main PWB.

CHAPTER 7. FLOWCHART

General Troubleshooting Procedures

Provides steps to troubleshoot common issues like CD playback failures and lens cleaning.

CD Playback Fault Diagnosis

Detailed steps for troubleshooting focus, RF signal, tracking, and spin systems.

CHAPTER 8. OTHER

Integrated Circuit Function Tables

Pin descriptions and functions for key integrated circuits like LA6261 and CD MP3 Decoder.

FL Display Pin Configuration

Grid assignment and pin connection details for the FL display module.

PARTS GUIDE

Component Reference Lists

Comprehensive lists of integrated circuits, transistors, diodes, transformers, capacitors, resistors, etc.

Miscellaneous Parts and Accessories

Lists other circuitry parts, cabinet components, speaker parts, and accessories.