Samsung YP-20S/T User manual

DIGITAL AUDIO PLAYER
YP-20S/T
SERVICE
1. Precautions
2. Specifications
3. Location of Controls
4. Troubleshooting
5. Exploded View and Parts List
6. Block Diagram
7. PCB Diagrams
8. Schematic Diagrams
Manual
DIGITAL AUDIO PLAYER CONTENTS
ELECTRONICS
© Samsung Electronics Co., Ltd. FEB. 2001
Printed in Korea
AH68-00817A

Samsung Electronics 1-1
1. Precautions
1. Some semiconductor (“solid state”)devices are easily damaged by static electricity.
Such components are called Electrostatically Sensitive Devices(ESDs); Examples included
integrated circuits and Some filed-effect transistors. The following techniques will reduce
the occurrence of component damage caused by static electricity.
2. Immediately before handling any semiconductor components or assemblies, drain the electrostatic change
from your body by touching a known earth ground.
Alternatively, wear a discharging wrist-strap device. (Be sure to remove it prior to applring
Power-this is an electric shock precaution.)
3. After removing an ESD-equipped assembly, place it on a conductive surface such as aluminum
foil to prevent accumulation of electrostatic charge.
4. Do not use freon-propelled chemicals. These can generage electrical charges that damage ESDs.
5. Use only a grounded-tip soldering iron when soldering ESDs.
6. Use only anti-static solder removal device. Many solder removal devices are not rated as
“anti-static”; these can accumulate sufficient electrical charge to damage ESDs.
7. Do not remove a replacement ESDs from its protective package until you are ready to install it.
Most replacement ESDs are packaged with leads that are electrically shorted together by conductive materials.
8. Immediately before removing the protective material from the leads of a replacement ESDs,
touch the protective material to the chassis or circuit or assembly into which the device will
be installed.
9. Minimize body motions when handling unpackaged replacement ESDs. Motions such as
brusing clothes togetherer or lifting a foot from a carpeted floor can generate enough static
electricity to damage an ESDs.

Precautions
1-2 Samsung Electronics
MEMO

Samsung Electronics 2-1
2. Specifications
YP-20S/T
12MHz, 16bit CISC
Built-in Memory 32MB (YP-20T)/64MB (YP-20S)
1.5V
ONE AAA-Size/4-hr or longer playing time (with alkaline batteries)
42x70x22.1mm /32G
Plastic
2.4Mbps at least
85dB
5mW
20Hz - 20KHz
Model
Processor
Memory Capacity
Power
Battery
Dimensions (W x H x D)
Case
File Transmission Speed
Noise Ratio
Earphone Output Power
Output Frequency Range

Specifications
2-2 Samsung Electronics
MEMO

Samsung Electronics 3-1
3. Location of Contols
3-1 Front Panel
3-2 Rear Panel
Forward / Reverse button
Volume control button
LCD
Stop / Play
Pause button
Mode / Menu button
SAMSUNG
Earphone jack
Battery Cover Lock
Connection cable
terminal
Battery Case

Location of Controls
3-2 Samsung Electronics
MEMO

Samsung Electronics 4-1
4. Troubleshooting
Symptoms Possible Causes Action Remark
No Power Faulty U8, Q4 Replace Main PCB
Faulty Display Faulty LCD Replace LCD
Faulty Download Faulty J1 J1 soldering Check
When connected “CONNECT” character will not disolay on LCD window.
Faulty U2, Y1 Replace Main PCB
No Sound Faulty U8, U10 Replace Sub PCB

Troubleshooting
4-2 Samsung Electronics
MEMO

Samsung Electronics 5-1
5. Exploded View and Parts List
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ŒAH97-00726A ASSY CABINET TOP;ABS,YP-20S/T,BROWN YP-20S
AH97-00725A ASSY CABINET TOP;ABS,YP-20S/T,BLUE YP-20T
´AH97-00728A ASSY CABINET BOTTOM;ABS,YP-20S,64MBYTE YP-20S
AH97-00727A ASSY CABINET BOTTOM;ABS,YP-20T,32MBYTE YP-20T
ˇAH71-00037A COVER-BATTERY;ABS,T1.0,-,-,IVORY,YP-20S/T
¨AH71-00038A CAP;RUBBER MOLD,T0.5,-,-,IVORY,YP-20S/T,-
ˆ6001-000809 SCREW;CH M2*L4 MACHINE
ØAH92-01036A ASSY PCB-MAIN;YP-20S/T,MAIN PCB ASSY COMMON
AH92-01070A ASSY PCB-MAIN;YP-20S/T,MAIN PCB ASSY,CHINA
CHINA/HONG KONG ONLY
∏AH67-00118A CASE BASKET;YP-20S/T,LCD COVER,SAMSUNG,SILVER,LCD
”AH07-00045A LCD;DCM-08B3FT-09,YP-MF64,-,30x60.35x1.7,BLK,-,0.3 COMMON
AH07-00054A LCD;DCM-08B3FT,YP-20S/T,CHINA,30*6
CHINA/HONG KONG ONLY
’AH92-01035A ASSY PCB-SUB;YP-20S,64MBYTE YP-20S
AH92-01034A ASSY PCB-SUB;YP-20T,32MBYTE YP-20T
˝AH59-00119A SPEAKER SYSTEM;YP-20S/T,SB-900NS,1MW,3MW/20MW
ÔAH39-00301A CABLE FORM;YD-138BK12,YP-MF64,4P,1.2M,-,-,PVC,BLAC
AH80-00021A INSTALL-CD;YP-20S/T,INSTALL CD,CD, DOMESTIC,-,-
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Loca-NO. Parts NO. RemarkDescription ; Specification