Precautions
Samsung Electronics
1-3
1-2 Servicing Precautions
CAUTION : Before servicing Instruments covered
by this service manual and its supplements, read and
follow the Safety Precautions section of this manual.
Note : If unforseen circument create conflict between
the following servicing precautions and any of the
safety precautions, always follow the safety precau-
tions. Remember: Safety First.
1-2-1 General Servicing Precautions
(1) a. Always unplug the instrument’s AC power cord
from the AC power source before (1) re-moving
or reinstalling any component, circuit board,
module or any other instrument assembly, (2)
disconnecting any instrument electrical plug or
other electrical connection, (3) connecting a test
substitute in parallel with an electrolytic capaci-
tor in the instrument.
b. Do not defeat any plug/socket B+ voltage inter-
locks with which instruments covered by this
service manual might be equipped.
c. Do not apply AC power to this instrument and
/or any of its electrical assemblies unless all
solid-state device heat sinks are correctly in-
stalled.
d. Always connect a test instrument’s ground lead
to the instrument chassis ground before connect-
ing the test instrument positive lead. Always
remove the test instrument ground lead last.
Note : Refer to the Safety Precautions section ground
lead last.
(2) The service precautions are indicated or printed on
the cabinet, chassis or components. When servic-
ing, follow the printed or indicated service precau-
tions and service materials.
(3) The components used in the unit have a specified
flame resistance and dielectric strength.
When replacing components, use components
which have the same ratings. Components i-enti-
fied by shading, by( ) or by ( ) in the circuit dia-
gram are important for safety or for the characteris-
tics of the unit. Always replace them with the exact
replacement components.
(4) An insulation tube or tape is sometimes used and
some components are raised above the printed
wiring board for safety. The internal wiring is
sometimes clamped to prevent contact with heat-
ing components. Install such elements as they
were.
(5) After servicing, always check that the removed
screws, components, and wiring have been in-
stalled correctly and that the portion around the
serviced part has not been damaged and so on.
Further, check the insulation between the blades of
the attachment plug and accessible conductive
parts.
1-2-2 Insulation Checking Procedure
Disconnect the attachment plug from the AC outlet
and turn the power ON. Connect the insulation resi-
stance meter (500V) to the blades of the attachment
plug. The insulation resistance between each blade of
the attachment plug and accessible conductive
parts(see note) should be more than 1 Megohm.
Note : Accessible conductive parts include metal pan-
els, input terminals, earphone jacks, etc.
Summary of Contents for DVD-S221
Page 21: ...2 14 Samsung Electronics Disassembly and Reaasembly MEMO ...
Page 30: ...4 1 4 Exploded View and Parts List 4 1 Cabinet Assembly 4 2 Deck Assembly Page 4 2 4 4 ...
Page 35: ...Exploded Views and Parts List 4 6 MEMO ...
Page 45: ...PCB Diagrams 7 2 Samsung Electronics 7 1 Main COMPONENT SIDE SOLDER SIDE ...
Page 46: ...PCB Diagrams Samsung Electronics 7 3 7 2 Jack ...
Page 47: ...PCB Diagrams 7 4 Samsung Electronics 7 3 Key Only for DVD S321 ...
Page 48: ...Samsung Electronics 8 1 8 Wiring Diagrams 8 1 DVD S221 S222 S320 ...
Page 49: ...Wiring Diagrams 8 2 Samsung Electronics 8 2 DVD S321 ...
Page 51: ...Schematic Diagrams 9 2 Samsung Electronics 9 1 Power ...
Page 52: ...Schematic Diagrams Samsung Electronics 9 3 9 2 AV Decoder Main Micom Key ...
Page 53: ...Schematic Diagrams 9 4 Samsung Electronics 9 3 Servo ...
Page 55: ...Schematic Diagrams 9 6 Samsung Electronics 9 5 Front Micom VFD Display Only for DVD S321 ...
Page 56: ...Schematic Diagrams Samsung Electronics 9 7 9 6 Video ...
Page 57: ...Schematic Diagrams 9 8 Samsung Electronics 9 7 Audio Only for DVD S221 S222 S320 ...
Page 58: ...Schematic Diagrams Samsung Electronics 9 9 9 8 Audio Only for DVD S321 ...
Page 59: ...Schematic Diagrams 9 10 Samsung Electronics 9 9 Headphone Only for DVD S321 ...
Page 60: ...Schematic Diagrams Samsung Electronics 9 11 9 10 KEY Only for DVD S321 ...
Page 61: ...Schematic Diagrams 9 12 Samsung Electronics MEMO ...
