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DHC - 2300K
DVD PLAYER CONTENTS
2. Reference Information
3. Product Specification
4. Operating Instructions
5. Disassembly and Reassembly
7. Electrical Part List
8. Block Diagram
9. PCB Diagrams
10. Wiring Diagram
11. Schematic Diagrams
1-1 Safety Precautions
1) Before returning an instrument to the customer, and then in the OFF position, measure from a
always make a safety check of the entire known earth ground (metal water pipe, conduit,
instrument, including, but not limited to, the etc.) to all exposed metal parts of the
following items: instrument (antennas, handle brackets, metal
cabinets, screwheads, metallic overlays,
(1) Be sure that no built-in protective devices are control shafts, etc.), especially and exposed
defective or have been defeated during servicing. metal parts that offer an electrical return path
(1) Protective shields are provided to protect to the chassis.
both the technician and the customer. Correctly Any current measured must not exceed 0.5mA.
replace all missing protective shields, including Reverse the instrument power cord plug in the
any remove for servicing convenience. outlet and repeat the test. See Fig. 1-1.
(2) When reinstalling the chassis and/or other Any measurements not within the limits
assembly in the cabinet, be sure to put back in specified herein indicate a potential shock
place all protective devices, including, but not hazard that must be eliminated before returning
limited to, nonmetallic control knobs, insulating the instrument to the customer.
fish papers, adjustment and compartment
covers/shields, and isolation resistor/capacitor
networks. Do not operate this instrument or should not
Test all be above
permit it to be operated without all protective exposed Meter 0.5mA)
devices correctly installed and functioning. Under
(2) Be sure that there are no cabinet openings
through which adults or children might be able
to insert their fingers and contact a hazardous Also test with Plug
reserved (Using AC
voltage. Such openings include, but are not
adapter Plug as Earth Ground
limited to, excessively wide cabinet ventilation required)
Fig. 1-1 AC Leakage Test
slots, and an improperly fitted and/or incorrectly
secured cabinet back cover.
(4) Insulation Resistance Test Cold Check-(1)
Unplug the power supply cord and connect a
(3) Leakage Current Hot Check-With the
jumper wire between the two prongs of the plug.
instrument completely reassembled, plug the
(2) Turn on the power switch of the instrument.
AC line cord directly into a 120V AC outlet. (Do
(3) Measure the resistance with an ohmmeter
not use a isolation transformer during this test.)
between the jumpered AC plug and all exposed
Use a leakage current tester or a metering
metallic cabinet parts on the instrument, such
system that complies with American National
as screwheads, antenna, control shafts, handle
Standards institute (ANSI) C101.1 Leakage
brackets, etc. When an exposed metallic part
has a return path to the chassis, the reading
Current for Appliances and Underwriters
should be between 1 and 5.2 megohm. When
Laboratories (UL) 1270 (40.7). With the
there is no return path to the chassis, the
instrument's AC switch first in the ON position
reading must be infinite. If the reading is not
(5) within the limits specified, there is the possibility the AC power cord for damage.
of a shock hazard, and the instrument must be
re-pared and rechecked before it is returned to 5) Components, parts, and/or wiring that appear to
the customer. See Fig. 1-2. have overheated or that are otherwise damaged
should be replaced with components, parts
and/or wiring that meet original specifications.
Additionally determine the cause of overheating
and/or damage and, if necessary, take corrective
Terminal action to remove and potential safety hazard.
Exposed 6) Product Safety Notice-Some electrical and
mechanical parts have special safety-related
characteristics which are often not evident from
Fig. 1-2 Insulation Resistance Test evisual inspection, nor can the protection they
give necessarily be obtained by replacing them
2) Read and comply with all caution and safety with components rated for higher voltage,
related notes non or inside the cabinet, or on the wattage, etc. Parts that have special safety
chassis. characteristics are identified by shading, an ( )
or a ( ) on schematics and parts lists. Use of a
3) Design Alteration Warning-Do not alter of add to substitute replacement that does not have the
the mechanical or electrical design of this same safety characteristics as the recommended
instrument. Design alterations and additions, replacement part might created shock, fire
including but not limited to, circuit modifications and/or other hazards. Product safety is under
and the addition of items such as auxiliary audio review continuously and new instructions are
output connections, might alter the safety issued whenever appropriate.
characteristics of this instrument and create a
hazard to the user. Any design alterations or
additions will make you, the service, responsible
for personal injury or property damage resulting
4) Observe original lead dress. Take extra care to
assure correct lead dress in the following areas:
(1) near sharp edges, (2) near thermally hot
parts (be sure that leads and components do not
touch thermally hot parts), (3) the AC supply, (4)
high voltage, and (5) antenna wiring. Always
inspect in all areas for pinched, out-of-place, or
frayed wiring, Do not change spacing between a
component and the printed-circuit board. Check
1-2 Servicing Precautions
CAUTION : Before servicing Instruments covered (3) The components used in the unit have a
by this service manual and its supplements, read specified flame resistance and dielectric
and follow the Safety Precautions section of this strength.
manual. When replacing components, use components
which have the same ratings. Components I-
Note : If unforeseen circument create conflict enti-fied by shading, by ( ) or by ( ) in the
between the following servicing precautions and circuit diagram are important for safety or for the
any of the safety precautions, always follow the characteristics of the unit. Always replace them
safety precautions. Remember: Safety First. with the exact replacement components.
1-2-1 General Servicing Precautions (4) An insulation tube or tape is sometimes used
and some components are raised above the
(1) a. Always unplug the instrument's AC power printed wiring board for safety. The internal
cord from the AC power source before (1) re- wiring is sometimes clamped to prevent contact
moving or reinstalling any component, circuit with heating components. Install such elements
board, module or any other instrument as they were.
assembly, (2) disconnecting any instrument
electrical plug or other electrical connection, (5) After servicing, always check that the removed
(3) connecting a test substitute in parallel with screws, components, and wiring have been
an electrolytic capacitor in the instrument. installed correctly and that the portion around
b. Do not defeat any plug/socket B+ voltage the serviced part has not been damaged and so
interlocks with which instruments covered by on. Further, check the insulation between the
this service manual might be equipped. blades of the attachment plug and accessible
c. Do not apply AC power to this instrument conductive parts.
and/or any of its electrical assemblies unless
all solid-state device heat sinks are correctly 1-2-2 Insulation Checking Procedure
d. Always connect a test instrument's ground Disconnect the attachment plug from the AC outlet
lead to the instrument chassis ground before and turn the power ON. Connect the insulation
connecting the test instrument positive lead. resistance meter (500V) to the blades of the
Always remove the test instrument ground lead attachment plug. The insulation resistance between
last. each blade of the attachment plug and accessible
conductive parts(see note) should be more than 1
Note : Refer to the Safety Precautions section Megohm.
ground lead last.
Note : Accessible conductive parts include metal
(2) The service precautions are indicated or printed panels, input terminals, earphone jacks, etc.
on the cabinet, chassis or components. When
servicing, follow the printed or indicated service
precautions and service materials.
1-3 ESD Precautions
Electrostatically Sensitive Devices (ESD) its protective package until immediately before you
are ready to install it. (Most replacement ESD
Some semiconductor (solid state) devices can be devices are packaged with leads electrically
damaged easily by static electricity. shorted together by conductive foam, aluminum
Such components commonly are called foil or comparable conductive materials).
Electrostatically Sensitive Devices(ESD). Examples
of typical ESD devices are integrated circuits and (7) Immediately before removing the protective
some field-effect transistors and semiconductor materials from the leads of a replacement ESD
chip components. The following techniques should device touch the protective material to the
be used to help reduce the incidence of component chassis or circuit assembly into which the
damage caused by static electricity. device will be installed.
(1) Immediately before handling any semiconductor CAUTION : Be sure no power is applied to the
components or semiconductor-equipped chassis or circuit, and observe all other safety
assembly, drain off any electrostatic charge on precautions.
your body by touching a known earth ground.
Alternatively, obtain and wear a commercially (8) Minimize bodily motions when handling
available discharging wrist strap device, which unpackaged replacement ESD devices.
should be removed for potential shock reasons (Otherwise harmless motion such as the
prior to applying power to the unit under test. brushing together of your clothes fabric or the
lifting of your foot from a carpeted floor can
(2) After removing an electrical assembly equipped generate static electricity sufficient to damage
with ESD devices, place the assembly on a an ESD device).
conductive surface such as aluminum foil, to
prevent electrostatic charge buildup or exposure
of the assembly.
(3) Use only a grounded-tip soldering iron to solder
or unsolder ESD device.
(4) Use only an anti-static solder removal devices.
Some solder removal devices not classified as
"anti-static" can generate electrical charges
sufficient to damage ESD devices.
(5) Do not use freon-propelled chemicals. These
can generate electrical charges sufficient to
damage ESD devices.
(6) Do not remove a replacement ESD device from
2. Reference Information
2-1 Component Descriptions
2-1-1 DVD ATAPI LOADER (DSL-710A)
* D.C. Power Supply
A 4-pin shrouded, keyed male connector is used to provide the D.C. Power.
The pin assignment is described below.
PIN DC VOLTS
Figure-1 D.C. Power Connector
* Interface Connector
A 39-pin male, unshielded, shrouded, keyed connector are applied.
Please refer to Section 7-2-3 regarding its pin definition.
* Electrical Charateristics
+5V DC with
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