Sharp xl dk257n

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XL-DK257N

SHARP SERVICE MANUAL

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No.82807XLDK257N

MICRO COMPONENT SYSTEM

MODEL XL-DK257N

XL-DK257N Micro Component System consisting of
XL-DK257N (main unit) and CP-DK257N (speaker system).

- 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.

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CONTENTS

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PRECAUTIONS FOR USING LEAD-FREE SOLDER

CHAPTER 1. GENERAL DESCRIPTION

[1] Important Service Safety Precaution
[2] Important Service Notes (for U.S.A only).
[3] Specifications .......
[4] Name Of Parts .....

CHAPTER 2. ADJUSTMENTS
[1] CD Section
[2] Test Mode ..
[3] Standard SpeCIficatlon Of Stereo System
Error Message Display Contents

CHAPTER 3. MECHANICAL DESCRIPTION
[1] Disassembly .....

CHAPTER 4. BLOCK DIAGRAM
[1] Block Diagram .....

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CHAPTER 5. CIRCUIT DESCRIPTION
[1] Waveforms Of Servo Circuit ..
[2] 10 Voltage ..............................

CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
LAYOUT

[1] Notes On Schematic Diagram
[2] Types Of Transistor And LED
[3] Schematic Diagram ............
[4] Charts Of Connecting Wires ..
[5] Wiring Side of PWB ...............

CHAPTER 7. FLOWCHART
[1] Troubleshooting ........................................... 7-1

CHAPTER 8. OTHER
[1] Function Table Of IC.
[2] FL Display .................

PARTS GUIDE

Parts marked with 'A" 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.

This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

SHARP CORPORATION

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XL-DK257N
PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder

"MAIN, POWER, AMPLIFIER, HEADPHONE, MICOM FIEFLASH, DISPLAY, SPEAKER, VOLUME LED LIGHT UP,
iPOD, CD PWB of this model employs lead-free solder.

The LF symbol indicates lead-free solder, and is attached on the PWB and service manuals. The alphabetical
character following LF shows the type of lead-free solder.

Example: E a

Sn-Ag-Cu Indicates lead-free solder of tin, silver and copper.

2. Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with
conventional lead wire solder may cause damage or accident due to cracks,
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, were
commend you to use a dedicated soldring bit, if you are not familiar with how to obtain lead-free wire solder or
soldering bit, contact our service station or service branch in your area.

3. Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220 °C which is higher than the conventional lead
solder by 40°C, and as it has poor solder wet ability, you may be apt to keep the soldering bit in contact with the
PWB for extended period of time. However, since the land may be peeled off or the maximum heat-resistance
temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady
soldering condition,
Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn on
and off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit
after every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Ref No. Parts No. Description
PWB-A 92LPWB7119MANS MAIN (A1), POWER (A2), AMPLIFIER (A3) , HEADPHONE (A4), MICOM REFLASH (A5)
PWB-B 92LPWB7119DPLS DISPLAY (B1), SPEAKER (B2), VOLUME LED LIGHT UP (B3)
PWB-C 92LPWB7119PODS iPOD
PWB-D 92LPWB711QCDUS CD