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Samsung Electronics

1-3

1-3 Precautions for Electrostatically Sensitive Devices (ESDs)

1-4 Special Precautions and Warning Labels for Laser Products

1. Some semiconductor ("solid state") devices

are easily damaged by static electricity. 
Such components are called Electrostatically
Sensitive Devices (ESDs).  Examples include
integrated circuits and some field-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 charge from your 
body by touching a known earth ground.
Alternatively, wear a discharging
wrist-strap device.  (Be sure to remove it
prior to applying 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 generate electrical charges that
damage ESDs.

5. Use only a grounded-tip soldering iron

when soldering or unsoldering ESDs.

6. Use only an 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 ESD 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 foam,
aluminum foil or other conductive
materials.

8. Immediately before removing the protective

material from the leads of a replacement
ESD, touch the protective material to the
chassis or circuit assembly into which the
device will be installed.

9. Minimize body motions when handing

unpackaged replacement ESDs. Motions
such as brushing clothes together, or lifting
a foot from a carpeted floor can generate
enough static electricity to damage an ESD.

Precautions

UL     : Manufactured for U.S.A. Market.
CSA  : Manufactured for Canadian Market.
EU 

: Manufactured for European Market.

SCAN : Manufactured for Scandinavian 

Market.

This Product Complies with
DHHS Rules 21CFR, Sub 
chapter J.At date of Manu-
facture

(UL)

(UL,CSA,SCAN)

(EU)

CERTIFIED ONLY TO CANADIAN
ELECTRICAL CODE. 

CERTIFIE EN VERTU DU CODE
CANADIAN DE LELETRICITE
SEULEMENT

(CSA)

CLASS 1
LASER PRODUCT

(UL,CSA,EU)

Fig. 1-3  Warning Labels  (Location: Enclosure Block)

Fig. 1-4   Warning Labels  (Location: Disc Clamper,  Inner Side of Unit Door or Nearby Unit Chassis )

CAUTION : 

INVISIBLE LASER RADIATION WHEN OPEN 

AND INTERLOCKS DEFEATEO AVOIDEXPOSURE TO BEAM

ADVARSEL:

USYNLIG LASERSTRÅLING VED ABNING

NÅR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION

UNDGA UDSAETTELSE FOR STRALING

VARO:

AVATTAESSA JA SUOJALUKITUS OHITETTAESSA 

OLET ALTTINA NAKYMATTÖMALLE LASERSATEILYLLE ALA
KATSO SATEESEEN!

VARNING:

OSYNLIG LASERSTRÅLNING NAR DENNA DEL 

AR OPPNAD OCH SPARREN AR URKOPPLAD BETRAKTA
EJSTRÅLEN!

Summary of Contents for YH-820

Page 1: ...LAYER Basic Model YH 820 PORTABLE DIGITAL AUDIO PLAYER Confidential SERVICEManual CONTENTS 1 Product Specifications 2 Block Diagram 3 Wiring Diagram 4 Exploded Views and Parts List 5 Electrical Parts List 6 Schematic Diagrams ...

Page 2: ...ELECTRONICS Samsung Electronics Co Ltd DEC 2004 Printed in Korea Code no AH68 01427X ...

Page 3: ...rrent for Appliances and Underwriters Laboratories UL Publication UL1410 59 7 With the unit completely reassembled plug the AC line cord directly into a 120V AC outlet With the unit s AC switch first in the ON position and then OFF measure the current between a known earth ground metal water pipe etc and all exposed metal parts Examples Handle brackets metal cabinets screwheads and control shafts ...

Page 4: ...nplug the unit s AC power cord from the AC power source before attempting to a Remove or reinstall any component or assembly b Disconnect an electrical plug or connector c Connect a test component in parallel with an electrolytic capacitor 3 Some components are raised above the printed circuit board for safety An insulation tube or tape is sometimes used The internal wiring may be clamped to preve...

Page 5: ...ready to install it Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam aluminum foil or other conductive materials 8 Immediately before removing the protective material from the leads of a replacement ESD touch the protective material to the chassis or circuit assembly into which the device will be installed 9 Minimize body motions when handing ...

Page 6: ...d plane which is grounded 3 The repair technician must wear a wrist strap which is grounded to the copper sheet 4 To remove the Optical Pickup block Place the set on the conductive sheet and momentarily touch the conductive sheet with both hands While working do not allow any electrostatic sources such as clothes to touch the unit 5 Ground the Short Terminal located on the PCB inside the Pickup As...

Page 7: ...Samsung Electronics 2 1 2 Block Diagram ...

Page 8: ...Samsung Electronics 3 1 3 Wiring Diagram ...

Page 9: ...Samsung Electronics 4 1 4 Exploded Views and Parts List ...

Page 10: ...7 2703 002714 INDUCTOR SMD 22UH 10 2016 L8 3301 001705 BEAD SMD 1005 TP 82OHM 164MHZ 137OH L9 3301 001477 BEAD SMD 60ohm 2 0x1 2x0 6mm 3000mA TP LD1 2703 001873 INDUCTOR SMD 4 7uH 20 6060 LD2 2703 002187 INDUCTOR SMD 4 7uH 20 6645 MIC1 3003 001087 MIC CONDENSOR 2V 500UA 44DB 2 2KOHM PS100 AH63 00844A CUSHION BOTTOM YH 820 EVA PS130 AH63 00845A CUSHION TOP YH 820 PSR Q15 0505 001426 FET SILICON IRL...

Page 11: ...Samsung Electronics 12 1 This Document can not be used without Samsung s authorization 6 Schematic Diagram 1 1 MAIN Circuit ...

Page 12: ...12 2 Samsung Electronics This Document can not be used without Samsung s authorization 1 2 MAIN Test Point Waveform ...

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