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1. Precautions
1-1 Safety Precautions
1. Be sure that all of the built-in protective devices are 5. With the unit completely reassembled, plug the AC
replaced. Restore any missing protective shields. line cord directly the power outlet. With the unit's
AC switch first in the ON position and then OFF,
2. When reinstalling the chassis and its assemblies, be measure the current between a known erath
sure to restore all pretective devices, including : ground (metal water pipe, conduit, etc.) and all
control knobs and compartment covers. exposed metal parts, including : antennas, handle
brackets, metal cabinets, screwheads and control
3. Make sure that there are no cabinet openings shafts. The current measured should not exceed
through which people--particularly children -- 0.5 milliamp. Reverse the power-plug prongs in the
might insert fingers and contact dangerous AC outlet and repeat the test.
voltages. Such openings include the spacing
between the picture tube and the cabinet mask, 6. Antenna Cold Check :
excessively wide cabinet ventilation slots, and With the unit's AC plug disconnected from the
improperly fitted back covers. AC source, connect an electrical jumper across the
two AC prongs. Connect one lead of the ohmmeter
If the measured resistance is less than 1.0 megohm to an AC prong.
or greater than 5.2 megohms, an abnormality exists Connect the other lead to the coaxial connector.
that must be corrected before the unit is returned
to the customer. 7. Some semiconductor ("solid state") devices are
easily damaged by static electricity.
4. Leakage Current Hot Check (See Fig. 1-1) : Such components are called Electrostatically
Warning : Do not use an isolation transformer Sensitive Devices (ESDs); examples include
during this test. Use a leakage current tester or a integrated circuits and some field-effect transistors.
metering system that complies with American The following techniques will reduce the
National Standards Institute (ANSI C101.1, occurrence of component damage caused by static
Leakage Current for Appliances), and Underwriters electricity.
Laboratories (UL Publication UL1410, 59.7).
8. Immediately before handling sny semiconductor
components or assemblies, drain the electrostatic
(READING SHOULD
NOT BE ABOVE charge from your body by touching a known
0.5mA) earth ground. Alternatively, wear a discharging
LEAKAGE
DEVICE CURRENT Wrist-strap device. (Be sure to remove it prior to
UNDER TESTER
TEST applying power--this is an electric shock
precaution.)
TEST ALL
EXPOSED METER
SURFACES 9. Design Alteration Warning :
2-WIRE CORD
Never alter or add to the mechanical or electrical
design of this unit. Example : Do not add
ALSO TEST WITH EARTH auxiliary audio or video connectors.
PLUG REVERSED GROUND
(USING AC ADAPTER Such alterations might create a safety hazard.
PLUG AS REQUIRED) Also, any design changes or additions will void
the manufacturer's warranty.
Fig. 1-1 AC Leakage Test
10. 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.




Samsung Electronics 1-1
Precautions


11. 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.

12. 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 leads and components
do not touch thermally hot parts.

13. 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.

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 Samsung Electronics
Precautions


1-2 Handling the optical pick-up
The laser diode in the optical pick up may suffer elec- WRIST-STRAP
trostatic breakdown because of potential static elec- FOR GROUNDING

tricity from clothing and your body.
1M


The following method is recommended. THE UNIT
(1) Place a conductive sheet on the work bench (The
black sheet used for wrapping repair parts.) 1M
CONDUCTIVE SHEET




(2) Place the set on the conductive sheet so that the
Fig.1-2
chassis is grounded to the sheet.
(6) Short the short terminal on the PCB, which is in-
(3) Place your hands on the conductive sheet(This
side the Pick-Up ASS'Y, before replacing the Pick-
gives them the same ground as the sheet.)
Up. (The short terminal is shorted when the Pick-
Up Ass'y is being lifted or moved.)
(4) Remove the optical pick up block
(7) After replacing the Pick-up, open the short termi-
(5) Perform work on top of the conductive sheet. Be
nal on the PCB.
careful not to let your clothes or any other static
sources to touch the unit.

Be sure to put on a wrist strap grounded to the
sheet.
Be sure to lay a conductive sheet made of copper
etc. Which is grounded to the table.




Samsung Electronics 1-3
Precautions


1-3 DVD Deck disassembly and reassembly
1-3-1 Disassembly 1-3-2 Assembly
1) Remove the power cable. 1) Replace the Pick-up.
2) Switch SW3 on Deck PCB to "OFF" before 2) Assemble the Deck PCB.
removing the Flat-Cable. 3) Reassemble the Deck.
( Inserted into DVD Main PCB DCN1. See Fig. 1-3) 4) Insert Flat-Cable into DVD Main PCB DCN1 and
3) Disassemble the Deck. switch SW3 on Deck PCB to "ON". (See Fig 1-3)
4) Disassemble the Deck PCB.

Note : If the assembly and disassembly are not done in correct sequence, the Pick-up may be damaged.




FLAT-CABLE




TO DVD MAIN PCB
(DCN1)




Fig. 1-3




1-4 Samsung Electronics