Sharp cd mps 440w

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CD-MPS440W

SHARP SERVICE MANUAL

No. xxxxxxxxxxxxx
MINI COMPONENT SYSTEM

MODEL CD-MPS44OW

CD-MPS440W Mini Component System consisting of CD-MP5440W
(main unit) and CP-ES440(Speaker System).

CD-R/RVV/ -DISC

5., names» - In the interests of user-safety the set should be restored to its original con-
'"'" H" mm" dition and only parts identical to those specified be used.

[flimgfi M P
DIGIYALAUDIU

Playable

/ CONTENTS \
CHAPTER 1. GENERAL DESCRIPTION CHAPTER 6. CIRCUIT SCHEMATICS AND PARTS
[1] PRECAUTION FOR USING LEAD-FREE LAYOUT

SOLDER ....................................................... 1-1 [1] NOTES ON SCHEMATIC DIAGRAM ..... 6-1
[2] SAFETY PRECAUTION FOR SERVICE [2] TYPES OF TRANSISTOR AND LED.
MANUAL ...... ..1-2 [3] SCHEMATIC DIAGRAM MA|N(1/3)
[3] VOLTAGE SELECTION ..1-2 [4] SCHEMATIC DIAGRAM MAIN(2/3)
[4] SPECIFICATIONS ..... 1 2 [5] SCHEMATIC DIAGRAM MAIN(3/3)
[5] NAMES OF PARTS... 3 [6] SCHEMATIC DIAGRAM POWER ......
[7] SCHEMATIC DIAGRAM DISPLAY .....
CHAPTER 2. ADJUSTMENTS [8] SCHEMATIC DIAGRAM CD .....
[1] ADJUSTMENT.... [9] WIRING SIDE OF PWB ...........
[2] TEST MODE [10] WIRING SIDE OF PWB MAIN TOP
[11] WIRING SIDE OF PWB MAIN BOTTO
CHAPTER 3. MECHANICAL DESCRIPTION [12] WIRING SIDE OF PWB POWER ..........
[1] REMOVING AND REINSTALLING THE [13] WIRING SIDE OF PWB DISPLAY TOP ...... 6-22
MAIN PARTS ...... [14] WIRING SIDE OF PWB DISPLAY BOT-
[2] DISASSEMBLY... TOM ................................................ 6-24
[15] WIRING SIDE OF PWB CD ........... 6-26
CHAPTER 4. DIAGRAMS
[1] BLOCK DIAGRAM MAIN ............ CHAPTER 7. FLOWCHART
[2] BLOCK DIAGRAM DISPLAY ...... [1] TROUBLESHOOTING .................................. 7-1
CHAPTER 5. CIRCUIT DESCRIPTION CHAPTER 8. OTHERS
[1] WAVEFORMS OF CD CIRCUIT [1] FUNCTION TABLE OF IC ..... 8-1
[2] VOLTAGE ....................................... [2] FL DISPLAY .............................. 8-7
Parts Guide

/

This document has been published to be used for
SHARP CORPORATION after sales service only.

The contents are subject to change without notice.

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CD-MPS44OW
CHAPTER 1. GENERAL DESCRIPTION

[1] PRECAUTION FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder
MAIN, POWER, DISPLAY, HEADPHONES, TERMINAL, CD SERVO, T/T MOTOR, SWITCH,TAPE MECHANISM 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.

IEa

S n-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, we recommend you to use a
dedicated soldering 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.

Example:

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 ofthe 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 DCEKKV57SSJ03 Main
PWB-B DCEKNV57SSJ03 Power(B1)lDisplay(BZ)/Headphones(BS)/TerminaI(B4)
PWB-C DCEKSV5755J03 CD Servo
PWB-F - T/T Motor
PWB-G - Switch
PWB-H 9GD192114325 Tape Mechanism