Sharp qt mp 3 w service manual

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Page 1

QT-MPSW

SHARP SERVICE MANUAL

CD R/Rw .. Plays [ﬂEDMPACT
- w. d
M P 3 Playable/ .IM MIarIiigyIs mmﬂéﬁ

CHAPTER 1. GENERAL DESCRIPTION
[1] Precaution For Using Lead-Free Solder ....... 1-
[2] Safety Precaution For Service Manual...
[3] Voltage Selection ...................................
[4] AC Power Supply Cord and

AC Plug Adaptor
[5] Speciﬁcations .....
[6] Names Of Parts..

CHAPTER 2. ADJUSTMENTS
[1] Tuner Section ...............
[2] Mechanism Section

CHAPTER 3. BLOCK DIAGRAM
[1] Block Diagram

CHAPTER 4. CIRCUIT DESCRIPTION
[1] Waveforms Of CD Servo Circuit ...... ....4-1
[2] IC Voltage ..................................... ..

CONTENTS

No. 896320TMP3W//

PORTABLE CD STEREO SYSTEM

MODEL QT-MP3W

- In the Interests of user-safety the set should be restored to
its original condition and only parts identical to those
specified be used.

CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS
LAYOUT

[1] Notes On Schematic Diagram
[2] Types Of Transistor And LED.
[3] Schematic Diagram ......
[4] Wiring Side Of PWB ..

CHAPTER 6. FLOWCHART
[1] Troubleshooting ..

CHAPTER 7. OTHERS
[1] Function Table Of IC .....
[2] LCD 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.

SHARP CORPORATION

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

Page 2

QT-MP3W

CHAPTER 1. GENERAL DESCRIPTION

[1] Precautions For Using Lead-Free Solder

1. Employing lead-free solder

"AUDIO, CONTROL, RECTIFIER, CD, TUNER, TAPE 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: BE 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 wettability, 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. Paris No. Description
PWB-A1 92LMP300280047 AUDIO
PWB-A2 92LMP300380092 CONTROL
PWB-A3 92LMP301280047 RECTIFIER
PWB-A4 92LMP300180024 TUNER
PWB-B 92LM P300980056 CD
PWB-C 92LMP301380047 TAPE