Sharp xl uh 4 h service manual

Page 1

XL-UH4H

SHARP SERVICE MANUAL

cn-n/HW/ @R-D-s

Playable

SAVING ENERGY

mm mm
momm 0.6w

-. Ways

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@DSIB MP3

4- MODE

PRESEI EOUALIZER

PLAVBACK

Windows
MediaN

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CHAPTER 1. GENERAL DESCRIPTION

Important Service Notes (For U.K. Only).
Specifications .......
Names Of Parts

CHAPTER 2. MECHANISM BLOCKS

Disassembly ................................................

PTER 3. DIAGRAMS
Block Diagram .............................................

PTER 4. CIRCUIT DESCRIPTION
Waveforms Of Servo Circuit
Voltage...

CONTENTS
PRECAUTIONS FOR USING LEAD-FREE SOLDER

2-1

N0. S7626XLUH4H/l

MICRO COMPONENT SYSTEM

MODEL XL-UH4H

XL-UH4H Micro Component System consisting of
XL-UH4H (main unit) and CP-UH4H (speaker system).

- In the interests of user-safety (Required by safety regula-
tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.

~ Note for users in U.K.
Recording and playback of any material may require
consent which SHARP is unable to give. Please refer
particularly to the provisions of Copyright Act 1956, the
Dramatic and Musical Performers Protection Act 1956, the
Performers Protection Acts 1963 and 1972 and to any
subsequent statutory enactments and orders.

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CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS
LAYOUT

[1] Notes On Schematic Diagram .. ...... 5-1

[2] Types Of Transistor And LED ...... 5-1

[3] Wiring Side Of PWB/Schematic Diagram . 5-2

CHAPTER 6. FLOWCHART
[1] Troubleshooting .....

CHAPTER 7. OTHERS
[1] Function Table Of IC.
[2] LCD Display ..............
[3] Wiring Of Primary Supply Leads
(For U.K. Only)....

PARTS GUIDE

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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

SHARP CORPORATION sales service only.

The contents are subject to change without notice,

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XL-UH4H

PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder

AUDIO, CONTROL, RECTIFIER, CD, MCU, USB 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, 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.

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 of for 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 sand paper.

Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Ref No. Parts No. Description
PWB-A1 92LUH400280029 AUDIO
PWB-A2 92LUH400380003 CONTROL
PWB-A3 92LUH401280000 RECTIFIER
PWB-B 92LUH400980000 CD
PWB-C 92LUH403280000 MCU
pWB.D 92LUH403080000 USB