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Samsung Electronics

1-2

1-1 Safety Precautions (Continued)

7. Components, parts and wiring that appear 

to have overheated or that are otherwise 

damaged should be replaced with parts 
that meet the original specifications.  

Always determine the cause of damage or

overheating, and correct any potential 
hazards

8. Observe the original lead dress, especially 

near the following areas:  Antenna 
wiring, sharp edges, and especially the

AC and high voltage power supplies.  
Always inspect for  pinched, out-of-place, 

or frayed wiring.   Do not change the 
spacing between components and the 
printed circuit board.  Check the AC 
power cord for damage.  Make sure that 
no wires or components touch thermally 
hot parts.

9. Product  Safety Notice: 

Some electrical and mechanical parts 

have special safety-related characteristics 

which might not be obvious from visual        
inspection. These safety features and the 
protection they give might be lost if the 
replacement component differs from the 
original--even if the replacement is rated 
for higher voltage, wattage, etc.  

10 Components that are critical for safety are 

indicated in the circuit diagram by 

shading,         or          .  Use replacement 
components that have the same ratings, 
especially for flame resistance and 
dielectric strength specifications. A
replacement part that does not have the 
same safety characteristics as the original 
might create shock, fire or other hazards.

1-2 Servicing Precautions

1. Servicing precautions are printed on the 

cabinet. Follow them.

2. Always unplug 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 
prevent contact with thermally hot 
components. Reinstall all such elements to
their original position.

4. After servicing, always check that the 

screws, components and wiring have been
correctly reinstalled. Make sure that the 
portion around the serviced part has not
been damaged.

5. Check the insulation between the blades of

the AC plug and accessible conductive parts
(examples:  metal panels, input terminals
and earphone jacks).

6. Insulation Checking Procedure: Disconnect

the power cord from the AC source and 
turn the power switch ON.  Connect an 
insulation resistance meter (500V) to the
blades of the AC plug. 

The insulation resistance between each 
blade of the AC plug and accessible 
conductive parts (see above) should be
greater than 1 megohm.

7. Never defeat any of the B+ voltage 

interlocks.  Do not apply AC power to the
unit (or any of its assemblies) unless all
solid-state heat sinks are correctly installed.

8. Always connect a test instrument's ground

lead to  the instrument  chassis ground 
before connecting the positive lead;  always
remove the instrument's  ground lead last.

Precautions

Warning1:

First read the "Safety Precautions" section of this manual. If some unforeseen circumstance creates a conflict 
between the servicing and safety precautions, always follow the safety  precautions.

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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