XL-DH20NH Micro Component System consisting of
XL-DH20NH (main unit) and CP-DH20NH (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.
CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS
LAYOUT
[1] Notes On Schematic Diagram ......................5-1
[2] Types Of Transistor And LED .......................5-1
Parts marked with " " 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 service only.
The contents are subject to change without notice.
XL-DH20NH
a
a
d
g
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 alphabetic
character following LF shows the type of lead-free solder.
Examples:
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 convention
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 recommen
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or solderin
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.
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 92L701CM90300Z REFRESH
Parts No.
Description
– 1
i
XL-DH20NH
CHAPTER 1. GENERAL DESCRIPTION
[1] Safety Precaution For Service Manual
WARNINGS
THE AEL (ACCESSIBLE EMISSION LEVEL) OF LASER POWER OUTPUT FOR THIS MODEL IS SPECIFIED TO
BE LOWER THAN CLASS I REQUIREMENTS. HOWEVER, THE FOLLOWING PRECAUTIONS MUST BE OBSERVED
DURING SERVICING TO PROTECT YOUR EYES AGAINTS EXPOSURE TO THE LASER BEAM.
1- WHEN THE CABINET HAS BEEN REMOVED, THE POWER IS TURNED ON WITHOUT A COMPACT DISC,
AND THE PICKUP IS ON A POSITION OUTER THAN THE LEAD-IN POSITION, THE LASER WILL LIGHT FOR
SEVERAL SECONDS TO DETECT A DISC.
DO NOT LOOK INTO THE PICKUP LENS.
2- THE LASER POWER OUTPUT OF THE PICKUP INSIDE THE UNIT AND REPLACEMENT SERVICE PARTS
HAVE ALREADY BEEN ADJUSTED PRIOR TO SHIPPING.
3- NO ADJUSTMENT TO THE LASER POWER SHOULD BE ATTEMPTED WHEN REPLACING OR SERVICING
THE PICKUP.
4- UNDER NO CIRCUMSTANCES LOOK DIRECTLY INTO THE PICKUP LENS AT ANY TIME.
5- CAUTION - USE OF CONTROLS OR ADJUSTMENTS, OR PERFORMANCE OF PROCEDURES OTHER THAN
THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE.
This product is classified as a CLASS 1 LASER PRODUCT.
[2] Specifications
General
Power source AC 220 - 240 V ~ 50/60 Hz
Power
consumption
DimensionsWidth: 155 mm (6-3/32")
Weight2.12 kg (4.67 lbs.)
( * ) This power consumption value is obtained when the
main unit is in stand-by mode without iPod charging.
Power on: 45 W
Power stand-by: 0.6 W (*)
Height: 178 mm (7-1/64")
Depth: 243 mm (9-9/16")
Amplifier
Output power MPO: 50 W (25 W + 25 W) (10% T.H.D.)
Output
terminals
Input terminals AUX IN (Analogue input):
RMS: 50 W (25 W + 25 W) (10% T.H.D.)
Speakers: 6 ohms
Headphones: 16 - 50 ohms
(recommended: 32 ohms)
500 mV/47 k ohms
CD player
TypeSingle disc multi-play compact disc
Signal
readout
D/A converter Multi bit D/A converter
Frequency
response
Dynamic
range
player
Non-contact, 3-beam
semiconductor laser pickup
20 - 20,000 Hz
90 dB (1 kHz)
USB
USB host
interface
Support fileMPEG 1 Layer 3
Bitrate supportMP3 (32 ~ 320 kbps)
OtherMaximum total number of MP3/
File system
support
Complies with USB 1.1 (Full
Speed)/ 2.0 Mass Storage Class.
Support Bulk only and CBI
protocol.
WMA (Non DRM)
WMA (64 ~ 160 kbps)
WMA files is 65280.
Maximum total number of folders
is 255 INCLUSIVE of root
directory.
The ID3TAG information
supported are TITLE, ARTIST and
ALBUM only.
Supports ID3TAG version 1 and
version 2.
Support USB devices with
Microsoft Windows/DOS/FAT 12/
FAT 16/ FAT 32.
2 kbyte block length for sector.
Tuner
Frequency range FM: 87.5 - 108 MHz
AM: 522 - 1,620 kHz
Speaker
Type
Maximum input
power
Rated input power 25 W
Impedance6 ohms
Dimensions
Weight
2-way 2-speaker system
5 cm (2") tweeter
10 cm (4") woofer
50 W
Width: 132 mm (5-13/64")
Height: 260 mm (10-15/64")
Depth: 171.5 mm (6-49/64")
Follow the below-mentioned notes when disassembling the unit and reassembling it, to keep it safe and ensure
excellent performance:
1. Take compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall outlet before starting to disassemble the unit.
3. Take off nylon bands or wire holders where they need to be removed when disassembling the unit. After servicing
the unit, be sure to rearrange the leads where they were before disassembling.
•Resistor:
To differentiate the units of resistors, such symbol as K and M are
used: the symbol K means 1000 ohm and the symbol M means
1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type.
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this symbol P
means pico-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression
"capacitance/withstand voltage is used".
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene
REF. NO
VOL1VOLUMEMAX -- MIN
K1ON/STAND-BYON -- OFF
K2FUNCTIONON -- OFF
K3PLAY/PAUSEON -- OFF
K4OPEN/CLOSEON -- OFF
type
DESCRIPTIONPOSITION
• Schematic diagram and Wiring Side of P.W.Board for this model are
subject to change for improvement without prior notice.
• The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given.
1. In the tuner section,
indicates A M
indicates FM stereo
2. In the CD section, the CD is stopped.
• Parts marked with “ () 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.
“
[2] Types Of Transistor And LED
FRONT
VIEW
ECB
(S)(G)(D)
(1)(2)(3)
S8550
L431
TOP
VIEW
EL817
(3)
(1)
B
E
TOP
VIEW
HY3D
HY4D
HA7
H1A
H2A
1Y
09S
FRONT
VIEW
BCE
SB772
(2)
TOP VIEW
C
FRONT
VIEW
1N4007
SB360
1N5399
1N4148
92L11103R02002
92L11103R06001
5 – 1
XL-DH20NH
[3] Schematic Diagram
A
B
MAIN PWB-A
CON 2.0mm(1x9)/AMP/PWR
CON13
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1000RH
1000RH
7R/2A
300RH
FB2
FB40
FB44
VCC
FB3
GND
GND
A-12V
A+12V
VCC
POWER_OFF
AMP-MUTE
A+12V
A-12V
R079 2R2
R078 2R2
E5/1
100UF/16V
E8/1
100UF/16V
C
EC35
470UF/10V
GND
Q8
2SB772
R052
R053
10K
1K
EC27
470UF/10V
+12V
-12V
GND
GND
AUDIO/VCC
D
3904
CD_POWER_CTRL
R054
10K
Q7
GND
GND
E
3
VIN
IC2
AM1117-1.8V
ADJ
1
GND
VOUT
3V3
2
EC14
220UF/10V
GND
MAIN VCC
AUDIO/VCC
C022
104P
GND
F
VCCC
G
NC
1000RH
FB45
FB19
EC30
47UF/10V
GND
3
VIN
IC1
AM1117-1.8V
ADJ
1
D16
IN4148
VOUT
FB1
2
C038
104P
GND
1000RH
MCU3V9
100UF/10V
GND
MCU_VCC/VREF
D8
IN4148
EC43
H
MCU VCC
1
23456
Figure 5-1: MAIN (VCC AND MCU VCC) SCHEMATIC DIAGRAM