Samsung CS721APF/SEAUX User manual

COLOR
TELEVISION
RECEIVER
CHASSIS: SCT52A
MODEL: CS721APF/SEAUX
CS721APF/SAPX
CS721APT/POLX
CS721APT/BOLIX
CS721APT/EUROX
"COLOR
TELEVISION
RECEIVER
11.
12.
10.
Manual
==!
. Precautions
. Reference Information
. Specifications
. Disassembly and Reassembly
. Alignment and Adjustment
. Troubleshooting
Exploded Views and Parts List
. Electric Parts List
Block Diagrams
PCB Layout
Wiring Diagram
Schematic Diagrams

Precautions
1. Precautions
Follow these safety, servicing and ESD precautions to prevent damage and protect against potential
hazards such as electrical shock and X-rays.
1-1 Safety Precautions
Be sure that all of the built-in protective
devices are replaced. Restore any missing
protective shields.
When reinstalling the chassis and its
assemblies, be sure to restore all protective
devices, including: nonmetallic control
knobs and compartment covers.
Make sure that there are no cabinet
openings through which people--
particularly children--might insert fingers
and contact dangerous voltages. Such
openings include the spacing between the
picture tube and the cabinet mask,
excessively wide cabinet ventilation slots,
and improperly fitted back covers.
If the measured resistance is less than 1.0
megohm or greater than 5.2 megohms, an
abnormality exists that must be corrected
before the unit is returned to the customer.
Leakage Current Hot Check (Figure 1-1):
Warning: Do not use an isolation
transformer during this test. Use a leakage-
current tester or a metering system that
complies with American National Standards
Institute (ANSI C101.1, Leakage Current for
Appliances), and Underwriters Laboratories
(UL Publication UL1410, 59.7).
With the unit completely reassembled, plug
the AC line cord directly into the power
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, conduit, etc.) and all
exposed metal parts, including: antennas,
handle brackets, metal cabinets, screwheads
and control shafts. The current measured
should not exceed 0.5 milliamp. Reverse the
power-plug prongs in the AC outlet and
repeat the test.
Samsung Electronics
ALSO TEST WITH
PuuG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
Fig. 1-1 AC Leakage Test
Antenna Cold Check:
With the unit's AC plug disconnected from
the AC source, connect an electrical jumper
across the two AC prongs. Connect one
lead of the ohmmeter to an AC prong.
Connect the other lead to the coaxial
connector.
X-ray Limits:
The picture tube is especially designed to
prohibit X-ray emissions. To ensure
continued X-ray protection, replace the
picture tube only with one that is the same
type as the original. Carefully reinstall the
picture tube shields and mounting
hardware; these also provide X-ray
protection.
High Voltage Limits:
High voltage must be measured each time
servicing is done on the B+, horizontal
deflection or high voltage circuits. Correct
operation of the X-ray protection circuits
must be reconfirmed whenever they are
serviced. (X-ray protection circuits also may
be called “horizontal disable" or “hold-
down")
Heed the high voltage limits. These include
the X-ray Protection Specifications Label, and
the Product Safety and X-ray Warning Note on
the service data schematic.
1-1

Precautions
1-1 Safety Precautions (Continued)
9. High voltage is maintained within specified
limits by close-tolerance, safety-related
components and adjustments. If the high
voltage exceeds the specified limits, check
each of the special components.
10. Design Alteration Warning:
Never alter or add to the mechanical or
electrical design of this unit. Example: Do
not add auxiliary audio or video
connectors. Such alterations might create
a safety hazard. Also, any design changes
or additions will void the manufacturer's
warranty.
11. Hot Chassis Warning:
Some TV receiver chassis are electrically
connected directly to one conductor of the
AC power cord. If an isolation transformer
is not used, these units may be safely
serviced only if the AC power plug is
inserted so that the chassis is connected to
the ground side of the AC source.
To confirm that the AC power plug is
inserted correctly, do the following: Using
an AC voltmeter, measure the voltage
between the chassis and a known earth
ground. If the reading is greater than 1.0V,
remove the AC power plug, reverse its
polarity and reinsert. Re-measure the
voltage between the chassis and ground.
12. Some TV chassis are designed to operate
with 85 volts AC between chassis and
ground, regardless of the AC plug polarity.
These units can be safely serviced only if
an isolation transformer inserted between
the receiver and the power source.
13. Some TV chassis have a secondary
ground system in addition to the main
chassis ground. This secondary ground
system is not isolated from the AC power
line. The two ground systems are
electrically separated by insulating
material that must not be defeated or
altered.
14. 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.
a
LL
TS
15.
16.
17;
18.
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.
Picture Tube Implosion Warning:
The picture tube in this receiver employs
“integral implosion" protection. To
ensure continued implosion protection,
make sure that the replacement picture
tube is the same as the original.
Do not remove, install or handle the
picture tube without first putting on
shatterproof goggles equipped with side
shields. Never handle the picture tube by
its neck. Some “in-line” picture tubes are
equipped with a permanently attached
deflection yoke; do not try to remove
such “permanently attached" yokes from
the picture tube.
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.
Samsung Electronics
1-2 Servicing Precautions
Precautions
WARNING!:
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.
WARNING2:
An
electrolytic
capacitor
installed
with
the
wrong
polarity
might
explode.
1.
Servicing precautions are printed on the
cabinet. Follow them.
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.
Some components are raised above the
printed circuit board for safety. An
insulation tube or tape is sometimes used.
The internal wiring is sometimes clamped to
prevent contact with thermally hot
components. Reinstall all such elements to
their original position.
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).
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 I megohm.
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.
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.
1-3 Precautions for Electrostatically Sensitive Devices (ESDs)
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.
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.)
After removing an ESD-equipped assembly,
place it on a conductive surface such as
aluminum foil to prevent accumulation of
electrostatic charge.
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.
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.
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.
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.
Minimize body motions when handling
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.
Samsung Electronics
43

Reference Information
MEMO
2. Reference Information
2-1 Tables of Abbreviations and Acronyms
Table 2-1 Abbreviations
Ampere Megavoit
Ampere-hour Megawatt
Angstrom Megohm
Decibel Meter
Decibel Referenced to Microampere
One Milliwatt Microfarad
Degree Celsius Microhenry
Degree Fahrenheit Micrometer
degree Kelvin Microsecond
Farad Microwatt
Gauss Milliampere
Gigahertz Milligram
Gram Millhenry
Henry Millititer
Hertz Millimeter
Hour Millisecond
inches Per Second Millivolt
Kilowatt-hour Nanofarad
Kilogram Ohm
Kilohertz Picotarad
Kilohm Pound
Kilometer Revolutions Per Minute
Kilometer Per Hour Revolutions Per Second
Kilovolt Second (Time)
Kilovolt-ampere Volt
Kilowatt Volt-ampere
Liter Watt
Megahertz Watt-hour
Cee
test
se
a
i
as
se
14
Samsung
Efectronics
Samsung
Electronics
21

Heterence Information
Table 2-2 Table of Acronyms
Automatic Brightness Limiter 70
Alternating Current L
Automatic Chroma Control L
Audio Frequency LED
Automatic Frequency Control LF
Automatic Fine Tuning MOSFET
Automatic Gain Control MIS
Amplitude Modulation NAB
American National Standards Institute NEC
Automatic Phase Control NTSC
Automatic Picture Control OsD
Audio-Video PCB
Automatic Volume Control PLL
Balance PWM
Bandpass Filter OIF
Blue-Y R
Community Antenna Television (Cable TV) RC
Citizens Band RF
Charge Coupted Device R-Y
Closed Circuit Television
Channet
Cathode Ray Tube
Continuous Wave
Direct Current
Digital Volt Meter
Electronics Industries Association
Etectrostatic Discharge
Electrostatically Sensitive Device
Feedback Pulse
Flyback Transformer
Flip-Flop
Frequency Modulation
Fail Safe
Ground
Green-Y
High
High-Frequency
High Fidelity
Inductance-Capacitance
Integrated Circuit
Intermediate Frequency
22
{input/output
left
Low
Light Emitting Diode
Low Frequency
Metal-Oxide-Semiconductor-Field-Effect-Tr
Multi-channel Tetevision Sound
National Association of Broadcasters
National Electric Code
Nationa! Television Systems Committee
On Screen Display
Printed Circuit Board
Phase-Locked Loop
Putse Width Modulation
Quadrature Intermediate Frequency
Right
Resistor & Capacitor
Radio Frequency
Red-Y
Second Audio Program
Surface Acoustic Wavelfilter)
Sound intermediate Frequency
Switching Mode Power Supply
Signal/Noise
Switch
Test Point
Transistor Transistor Logic
Television
Ultra High Frequency
Underwriters Laboratories
Ultraviolet
Variable-Capacitance Diode
Voltage Controfied Oscillator
Voltage Controlled Crystal Oscillator
Very High Frequency
Video Intermediate Frequency
Variable Resistor
Video Tape Recorder
Vacuum Tube Voltmeter
Transistor
Samsung Electronics
2-2 1C Line Up
SS
JOO
Series
coecccecceccssescsscsecscseesesesecseecesecnsacenssesesesanseesessseeneneqecneterevsrsisenensrsstisesemeeretennrarearastes
IF
processing
(IF
Board)
200
Series
.....scccescscsssscsessssesessnssesesecerescsesseseeaesesssaesacseaeseesassecessasscescaeaveseeravennansacersessnsereeses
Video,
Chroma
Processing
BOO
Series
o.ccccecccseceessesesecsesesesscseseeseenescesceceueeeensaesieitenenersimsseaceecseanseesans
addarrseestetieeehie
ss
Vertical
Deflection
400
Series
oo.
cccecessecsssecsscesseesssececeveneescnsevesecseseanenssesnensacnnacsucssneensacanenanenncaaes
...
Horizontal
deflection
SOO
Series
ooececsssccesesseecsesesssessesseconseseneesesscensssesacssssnersanececnessersessesnesseesssesesseesstassnenavenaesctaneaeeess
CRT
Drive
Processing
600
Series
o..ceeccccsccsssesssessessecneestcnveneensssesstsaneseesessssaeanssesesonsevenaesneersaucaensaneancqneesanecnisancareeratesestecaeesstss
Sound
Processing
JOO
Series
..cscecssssesseessecseeeeeeesessrsneescsscsacsseesesseanensessenscssenssenssscaresnseacaneneenseneenecgtenagerensnents
A/V
Switching
Processing
BOO
Series
oovceeccescsesssssssccsecesecceeesuceneecsscsnsscsessesesecneesecsnessseussasecanecaesaveesecssessseasseneeanensenareastenes
AC
Input
Power
Supply
QOO
Series
coeccsssscsscsesseessecssessncesncsessescccssceveeneesessessessassnsssssnecsscssuecueesucsnrasecesosessasssnecananseeseennennesseeasennes
MICOM
Section
WOO
Series
...ceccsecccsssscseesssecsseesssessnscsssssssuessanecnssessessacesnsessesansecunessansessosessnnecsaseesnserensgnanstensy
IF
Section
(Main
Supply)
RT,
CT,
ICT
eessecsessssesssesescoucssssconesuceveeseesstssscasvecncsussnseneeaccnsecanecuseanecuessnesosesneanecanesssenecsanseaseaeeansnnees
TELETEXT
Section
RC,
CO,
HC,
SWY
cesesssssssscssessesceresseesessnssscesssvseseasensesaneenecanetaeccnceunssuecsscanssavanseenscoassens
SNAP-IN
Section
(Control)
RV,
CV,
LV
OV.
eecssesssesssscsnessecsssesneessccasssseenuessssuesscanscarsneessessneenscanecananussncsneasenssscavecnnensscevenveenseaenaarasnne
tine
V/M
Section
RY
CI
LJ
DY
ACI
oesseseessssessssssccsessesesnscsessssenesnsecssnsccsnscssnsesnasscsssusesssersenssceenncassncereeneetensansnrcssicasiansaseses
NICAM
Section
RP,CP,LP,XPACP
...ceessesssscseeecsessesessscuscsesssvcsscsecersceusencescssucsusenscanscascenensccassssensecsnecnscesesassensransnsenecnoganens
ness
PIP
Section
RCE,CO,DZC,QC
creeccsecssssssscsesnnessessnessesssensnsesesssecsscaneseensssnessncansssnsnsanvecersencenscanacanerncsaveqnesancnnets
COMB
Filter
Section
RP,PD
oocccsseccsssescsseessesensesesseccsscsscssssssssessssessvecsnecescceseeasesnanersnsssavonevecencesnensnasaressansennenonsetnrteaee
POWER-S/W
Section
i
Samsung Electronics
2:3

Reference Information
2-3 IC Line Up
Table 2-1 iC Line Up
Loc No No Specification Description | Remarks
C14 | 1 ] TDA9815 | VIF-PLL/DUAL FM-PLL/AM DEMODULATOR
1201 2 ie TOA4566 COLOUR TRANSIENT IMPROVEMENT
e202 ] 3 | TDAS162 EOEATSC/EECAMT DECODER AND SYNC PROCESSOR
ic203 4 | ToAs7e0 AGB VIDEO PROCESSOR ie ea
ADJUST
if 5 TDA4665 BASE BAND DELAY LINE
6 | TDA9170 YUV PICTURE IMPROVEMENT PROCESSOR
MC14577 OP-AMPLIFIER |
VERTICAL DEFLECTION
TOAG1010 VIDEO OUTPUT AMPLIFIER
MC4588C OP-AMPLIFIER
era
TA8216H AUDIO AMPLIFIER
UPC1853 MATRIX SURROUND IC
IC603 16 TDAS840 STEREQ/DUAL SOUND PROCESSOR
(C01 7 | SAA7283 NICAM DECODER
I1CJ02
18
MC4558C
OP-AMPLIFIER
NICAM
PART
1C170
19
TC4053BP
AN
SWITCHING
IC
NICAM
PART
1C702
i ae
2-4
Samsung Electronics
Reference information
Table 2-1 IC Line Up (Continued)
Speicaion
|
Description
i
Remarks
KA2192 AN SWITCHING IC
1€703
10704
{C801
STR-S6709 | SMPS CONTROL
+.
1C901
RM118
zl
MICOM
[
1902
XLS24CO8P
FEPROM
|
TELETEXT
PART
+
(CTO)
SAAS281
TELETEXT
TELETEXT
PART
§CT02
TEAS114A | RGB SWITCHING
ICP101
TDAS160A
PIP
PART
maz)
AL/NTSC/SECAM DECODER AND SYNC PROCESSOR
< |
1CP102
TDA9815
F-PLL
PIP
PART
es
b=
oe
ome
fe
fics
|
30
|
soasies
|
PIP
PROCESSOR
PIP
PART
=
PHOTO-COUPLER
:
oo
|
[wns
[ewer
baal
Option: OSD Language
Table 2-2
Specification
Description
Remarks
RM118 CIS SSOM-118CIS ENG/RUS/HUN/POL/CZE/CRO/ROM/BUL/TUR
RM118 ASIA SSOM-118ASIA ENG/TAI/MALAND/VIET
RM118 CHINA
SSOM-118CHINA ENG/CHINA
RM118 ARAB SSOM-118ARAB ENG/ARAB/IRAN
eee
et
Samsung Electronics 25

MEMO
i vn oa a
26
Samsung
Electronics
Specificatons
ne
NT
EE
OLS
3. Specifications
MODEL
T21A/2901A
TUNING
Frequency
Synthesizer
SYSTEM
COLOUR
PAL,
SECAM,
NTSC3.58,
NTSC4.43
SOUND
B/G,
D/K.
LM
NICAM
B/G!
ANTENNA
IMPEDANCE
75
ohm
unbalanced
coaxial
SCREEN
SIZE
70.8.
cm
POWER
CONSUMPTION
140watts
REQUIREMENTS
Main
voltage
:
220V/230V/240V
co
Cover range : 100 - 260Vco
FREQUENCY 50/60Hz
PROGRAMME CHANNEL 100 channels
SOUND
OUTPUT
15
watts/ch.
x2
DIMENSIONS
SET
781
x
495
x
556
(mm)
(WxDxH)
TRANSMITTER
With
TTX
:60
x
18
x
244
Without TTX : 60 x 19 x 210
WEIGHT SET 52 Kg
TRANSMITTER 140g (Including Batteries)
Specifications are subject to change.
ee
Samsung
Electronics
3-1

Disassembly and Reassembly
4. Disassembly and Reassembly
4-1 Cabinet
a
NLS
1. Remove 9 screws located on the side of the cabinet.
2. Pull the Main Assembly backwards to remove.
3. To reassemble, place the receiver on a flat surface and repeat the
sequence in reverse order.
4. To check that the Chassis Assembly is installed correctly, attempt
to pull it from the front cabinet.
TTT © HTIMIT.§ C
Fig. 4-1
ne
ee
Ae
:
en
rn
i
ne
ee
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Samsung
Flectronics
Samsung Electronics
4-1

Disassembly
and
Reassembly
Disassembly
and
Reassembly
4-2
Speaker
4-3
Chassis
Assembly
1.
Separate
Connectors
@,
®.
°
4-3-1
Removal
from
Front
Cabinet
2. Spearate wires from twist-lock.
1. Lift and pull back the chassis mounting.
3. Remove 2 screws, ©.
4.
To
reassemble,
repeat
the
sequence
in
reverse
order.
i
Fig. 4-2
ns
4-
¢ Samsung Electronics Samsung Electronics 43

Disassembly and Reassembly
4-3-2 Terminal Board
Removal
1. Pull the power cord to the left and remove it.
2. Remove 2 screws ®.
3. Lift up the 2 brackets ®). Separate the terminal board from the chassis mount.
4. To reassemble, refer to Fig. 4-6.
TERMINAL-BOARD
HOLDER-CHASSIS
$ Cort Jack
S-VHS Jack
Fig. 4-5
Insert
“L stuff on the left and right bottom of the terminal board to
"hole on the holder chassis.
Fig. 4-6
4-4
Samsung Electronics
Disassembly and Reassembly
4-3-3 PCB
Removal
Pe No
Refer to the Fig. 4-4
Remove
the
wire
(1P)
from
the
chassis
mounting.
Pull
the
PCB
guides
backwards.
Lift
both
edges
of
the
PCB
and
pull
it
out.
Disassembly
1.
2.
Ensure
that
the
PCB
is
well
positioned
in
the
PCB
guides.
The
power
cord
must
not
touch
the
heat-sink,
D73.
Insert
the
PCB
guide
in
the
direction
shown
so
that
the
two
yrs
meet
each
other.
The
PCB
guide
is
part
of
the
chassis
mounting;
if
a
new
PCB
guide
is
needed,
the
complete
chassis
mounting
must
be
replaced.
4-3-4 SNAPIN Removal
SNAPIN-CONTROL
Fig.
4-7
Press
the
SNAPIN
(b)
with
thumb;
pull
the
left
holder-bracket
(a)
with
index
finger.
nc
Samsung
Electronics
45