Sharp xl dh 20 nh service manual

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XL-DH20NH

SHARP SERVICE MANUAL

N0.S7929XLH20NHH

MICRO COMPONENT SYSTEM

MODEL XL-DH20NH

XL-DH20NH Micro Component System consisting of
XL-DH20NH (main unit) and CP-DHZONH (speaker system).

i

- 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.

I:I Made for iPod is a trademark of Apple Inc., registered in the
@ I Pod U.S. and other countries.

FM TUNER SAVING ENERGY
mm.

flee -

CD'H/RW 3 dl Windovvs

Playable / M P DIGITAL AUDIO . w Media M

CONTENTS
PRECAUTIONS FOR USING LEAD-FREE SOLDER CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS
LAYOUT

CHAPTER 1. GENERAL DESCRIPTION [1] Notes On Schematic Diagram ...................... 5-1
[1] Safety Precaution For Service Manual ........ 1 [2] Types Of Transistor And LED ...5-1

[2] Specifications .......
[3] Names Of Parts...

-1
-1 [3] Schematic Diagram ...............
-2

.1
....1 [4] Charts Of Connecting Wires .....

5-22

[5] Wiring Side Of PWB ................................... 5-24
CHAPTER 2. MECHANISM BLOCKS
[1] Caution On Disassembly ............................. 2-1 CHAPTER 6. FLOWCHART
[1] Troubleshooting ............................................ 6-1
CHAPTER 3. DIAGRAMS
[1] Block Diagram ............................................. 3-1 CHAPTER 7. OTHERS
[1] Function Table Of lC.
CHAPTER 4. CIRCUIT DESCRIPTION [2] VFD Display ..............
[1] Waveforms Of Servo Circuit ........................ 4-1
[2] Voltage ......................................................... 4-2
PARTS GUIDE

K J

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
S HARP CO RPO RATIO N after sales sen/ice only.

The contents are subject to change without notice.

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XL-DHZONH
PRECAUTIONS FOR USING LEAD-FREE SOLDER

1. Employing lead-free solder

"MAIN, POWER, DISPLAY, HEADPHONE, USB, iPod, REFRESH 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 alphabetica
character following LF shows the type of lead-free solder.

Examples:

lEa
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 conventione
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 recommeni
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or solderini
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-A 92L701M5673006 MAIN

PWB-B 92L701CM904001 POWER

PWB-C 92L701CM903002 DISPLAY

PWB-D 92L701CM903005 HEADPHONE

PWB-E 92L701CM90300E USB

PWB-F 92L701CM90300W iPod

PWB-G 92L701CM903002 REFRESH