Samsung CB5012A/SGX User manual

ax | SERVICE MANUAL
MODEL : CB5012A/SGX, |
CB5012AT/SGX < TTX
CHASSIS : P68SA, <T> &RM109
SPECIFICATIONS
Television System : PAL - B/G REMOTE CONTROL SYSTEM
Receiving Channel :
Intermediate Frequency :
I-F Carrier em ON
Picture I-F Carrier
Sound I-F Carrier
Colour Sub Carrier
(Units:MHz)
Picture
Tube
:
20"
A48KRD82X/51GGB95X
diagonal
measured,
Quick-start,
In-line-gun,
Black
stripe,
90°
degrees
deflection
Power Requirements : AC 230V, 50 Hz, 85 WATT
Antenna
Input
Impedance:
VHF,UHF
:
75
Ohm
unbalanced
type
Speaker : Impedance : 8 Ohm, 3W
Features
:
Voltage
synthesized
tuning
System,
On-screen
Display,
Auto-fine
Tuning,
Dark
Tube,
Auto
Brightness
Control,
29-Key,
38-Key<TTX>
Transmitter.
SAFETY CAUTION :
Before
servicing
this
model,
it
is
important
that
a
service
technician
reads
and
follows
the
"Safety
Precaution"
and
"Product
Safety
Notice”
in
this
Service
Manual.
* For continued X-radiation, replace the picture tube with original type.
* Design and specifications are subject to change without prior notice.
*
WARNING-SHOCK
HAZARDS
-
Use
an
isolation
transformer
when
servicing.

i
LE OF CONTENTS
TAB
£ INSTRUCTIONS “eo ein 4
2.CHASSIS
BLOCK
DIAGRAM
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2
3.POWER SUPPLY SECTION
4.BLOCK-DIAGRAM cvscsssectereessssrsesssesseeserinmseseteertmmnne 3
DINTRODUCTION vvvrrveeccccsceeemesnennne Bad
3,1C SPECIFICATION (SDH209B )
b
FYBlock-Diagrarm vs-sesreseeesssrceesssecsreesnseeeeteeee sneeennanee
2)Electrical
Characteristics
----------
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4
4.CHROMA,
VIDEO,
IF,
SOUND,
DEFLECTION
SECTION
4.1C SPECIFICATION(TDA8362)
Q)BIOCK-DiagQrearm
ov---esecceese
ess
eescteenscteeerseeeecetnnannne
tet
5
3)Pin
Function
<r
reerncnsnenesetnnennnmecnns
§
2.CHROMA VIDEO SECTION
AYBIOCK-
Diagram
os---s-seseesseneesertetnneestnettettnsten
6
2)Actuating
Description
screenees
6
3)IC
Block-Diagram
(TDA
8362).
ener
7
4)IC
Specification
(TDA
8395
)
«------------1-r
re
|
7-
8
B)IC
Specification
(TDA4661)
----ne-eeeneeneee
8-9
3.1F SECTION
A)
BIOCK-Dia
gran
sere
essesscceeeseeectntnernttnmesctenemsese
9
2)Actuating
Description
«ee
ceeesseeesceeeeeceeeeneeeetteete
9-10
3)IC
Block-Diagram
(TDA
8362
)
--e
ree
10
4.SOUND SECTION
4)Block-Diagrarm
--srrrsssresreseecannenetensecnrtte
40
2)Actuating
Description
----
ee
10-11
3)IC
Block-Diagram
(TDA8362
)--------
ere
1
4)IC
Specification
(TDA1013A)
«reer
1
5.DEFLECTION SECTION
2)Actuating Description iaduistbhennawrrsad ioe dD
3)IC Block-Diagram (TDA8362) w----e errr 13
4)IC Specification (KA2131) es errneeneee 13
5.REMOCON SECTION
A.INTRODUCTION sss essssesseccessonseeres tn cseesserenmesseneennnnnaneees 14
2BLOCK-DIAGRAM —wssssssssssesssescesnssmmunsnsesensssaccemeerenees 15
3.PIN
FUNCTION
seers
45-16
6.ALIGNMENT and ADJUSTMENT
1.GENERAL INFORMATIONS 0 -esrsrnneseeeree 16
3, HIGH VOLTAGE CHECK wwssessserrsstecssteereseesseseeeeeees 16
4.HORIZONTAL PHASE ADJUSTMENT sere 16
5
NVERTICAL
HEIGHT
ADJUSTMENT
rr
17
6.SCREEN ADJUSTMENT ossss--eeetenscecrecnsins 17
BRE AGC ADJUSTMENT <rssersernreensnnerees 47
9. COLOUR PURITY ADJUSTMENT evserrne 17
10.CRT WHITE BALANCE ADJUSTMENTS +2 17
41.,CONVERGENCE ADJUSTMENTS
1)Centre Convergence Adjustment --------- 17-19
2)Circumference Convergence Adjustment ~-------- 19
12. VIF(SIF) ADJUSTMENT | verre rrrrereeteetscee res 49
7.TELETEXT SECTION (OPTION)
41.TTX BLOCK DIAGRAM vrrsesscrssseessescecsesesseseeeneenee 20)
2.SEMICONDUCTOR SPECIFICATION 77" 20 - 26
8.TROUBLESHOOTING CHARTS | erences 27 - 30
9.NSERTING FROM OF THE IMPORTANT PARTS ~~ 31
40.CHASSIS REPLACEMENT PARTS LIST ~~; 32-37
11.EXPLODEO-VIEW & PARTS LIST ooo 38 - 39
12.SCHEMATIC-DIAGRAM neers 41-42
13.PWB
PATTERN
&
LOCATION
errr
43

Many electrical and mechanical parts in this chassis have
often passed unnoticed by visual inspection and the protection
afforded by them cannot necessarily be obtained by using
replacement components rated for higher voltage, wattage, etc.
The replacement parts which have these special safety
characteristics are identified in this manual and its
PRODUCT SAFETY NOTICE
supplements:
electrical components having such features are identified by
shading on the schemaiic diagram and the parts list:
Before replacing any of these components, read the parts list
in this manual carefully. The use of subsititute parts which do
not have the same safety characteristics in the parts list may
create a shock, fire, X-radiation or other hazards.
SERVICE NOTES
1.when replacing the parts or the circuit boards, clamp the
lead wires to the terminals before soldering.
2.When replacing a high wattage resistor (oxide metal film
resistor) in the circuit board, keep the resistor 10mm (1/2 in)
away from the circuit board.
AN
~ The lighting flash and arrowhead
within the triangie is a waming sign
alerting you of “dangerous
voltage” inside the product.
PULL THE CHASSIS-RAIL
3312 SERIES TO BESIDE (@) ) THEN
3313 SERIES SEPARATE THE CHASSIS
3315 SERIES (@)
3325 SERIES
3327 SERIES
5012 SERIES
5013 SERIES
5015 SERIES
5025 SERIES
5026 SERIES
5027 SERIES
5322 SERIES
5022 SERIES
" * IN CASE OF
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: To reduce the risk of
electric shock, do not remove cover
(or back) no user serviceable parts
inside. Refer servicing to qualified
3.Keep the wires away from high voltage or high temperature
components. ,
4.f any fuse in this TV receiver is blown, replace it with the
FUSE specified in the chassis parts list.
AN
The.exciamation point within the
triangle is a waming sign alerting
you of important instructions
accompanying the product.
* IN CASE OF
3351 SERIES
3352 SERIES
3357 SERIES
3852 SERIES
3857 SERIES
5051 SERIES
5052 SERIES
5057 SERIES
3362 SERIES
5062 SERIES
5061 SERIES
5361 SERIES
5314 SERIES
AT FIRST PUSH THE LOCK SWITCH .DTHEN
TAKE OUT THE CHASSIS. (2)
CODE NO ; 38114-698-710

X-RADIATION PRECAUTION
1.
Excessive
high
voltage
can
produce
potentially
hazardous
X-
RADIATION.
To
avoid
such
hazards,
the
high
voltage
must
not
exceed
the
specified
limit.
The
norminal
value
of
the
high
‘voltage
of
this
receiver
is
24.0KV
at
zero
beam
current
(minimum
brightness).
The
high
voltage
must
not,
under
any
ciroumstances,
exceed
30KV.
Each
time
a
receiver
requires
servicing
and
the
high
voltage
should
be
checked
following
the
HIGH
VOLTAGE
CHECK
procedures
in
this
manual.
It
is
recommended
that
the
reading
of
the
high
voltage
should
be
recorded
as
a
part
of
the
service
record.
It
is
important
to
use
an
accurate
and
reliable
high
voltage
meter.
2.
This
receiver
is
equipped
with
a
Fail
Safe
(FS)circuit
which
prevents
the
receiver
from
producing
an
excessively
high
voltage even if the B* voltage increases abnormally. Each
time the receiver is serviced, the FS circuit must be checked
to determine that the circuit is property functioning, following
the FS CIRCUIT CHECK procedures in this manual.
3. The only source of X-RADIATION is this TV receiver. It is the
picture tube. For continued X-RADIATION protection, the
replacement tube must be exactly the same type as specified
in the parts list.
4. Some parts in this receiver have special safety
related characteristics for X-RADIATION protection. For
continued safety, the parts replacement should be undertaken
only after referring to the PRODUCT SAFETY NOTICE.
SAFETY PRECAUTION
Waming
:
Serivce
should
not
be
attempted
by
anyone
unfamiliar
with the necessary precautions on this receiver. The
followings are the necessary precautions to be
observed before servicing this chassis. ,
Since the chassis of this receiver is directly connected
tothe AC power line-(Hot chassis), an isolation
transformer should be used during any dynamic
‘service to avoid possible shock hazards.
1. Always discharge the picture tube anode to the CRT
conductive coating before handling the picture tube. The
picture tube is highly evacuated and if broken, glass
fragments will be violently expelled. Use shatter proof
goggles and keep picture tube away from the unprotected
body during handling.
2.
When
replacing
a
chassis
in
the
cabinet,
always
be
certain
that
all the protective devices are put back in place, such as non -
metallic control knobs, insulating covers, shields, isolation
resistor, capacitor, network, etc.
3. Before retuming the set to a customer, always perform an AC
leakage current check on the exposed metallic parts of the
cabinet, such as antennas, terminals, screwheads, metal:
overlays, control shafts, etc. To be sure the set is safe to
operate without danger of an electrical shock. Plug the AC line
cord directly to a AC outlet (do not use a line isolation
transformer during this check). Use an AC voltmeter having
5000 ohms per volt or more sensitivity in the following
manner: Connect a 1500 ohm 10 watt resistor, paralleled by a
0.158, AC type capacitor, between a known good earth
ground(water pipe, conduit, etc.) and the exposed metallic
parts, one at a time. Measure the AC voltage across the
combination of 1500 ohm resistor and 0.15mfd capacitor.
Reverse the AC plug at the AC outlet and repeat the AC
voltage measurements for each exposed metallic part. The
measured voltage must not exceed 0.3 volts RMS. This
corresponds
to
0.5
milliamp
AC.
Any
value
exceeding
this
limit
constitutes a potential shock hazard and must be corrected
immediately.
AC VOLTMETER
NTSC sampie
TOSHIBA
CF 917A
Figure 1. AC Leakage Current Check

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1.INSTRUCTIONS
Pha
at
1.1C LINE UP
Specification
Description
Remarks
PAL/SECAM Decoder
TDA8362
a
(VIF/SIF/VIDEO,Chroma/H-osc,
V-osc)
TDA8395
SECAM
Decoder
TDA4661
1
H
Delay
KA2131
Vertical
output
SPM-109B
_6Kz
—
com
(with
TTX)
°
SPM-133
|
4K
—com
(W/O
TTX)
.
X24C02P
NON-VOLATILE
Memory
(E
PROM)
LA7910
BAND
SELECTOR
TDA1013A
Sound
output
Amplifier
SDH209B
PWM-Controller
for
SMPS
SAA3010 Remote Control
2.MEANS
OF
COMPONENTS
NUMBER
SERIES
100
Series
-------
TUNER/IF/AFT/AGC
500
Series
-------
Chroma/peaking
processing
processing
600
Series
-------
Sound
processing
200
Series
-------
Video/Luminance
processing
700
Series
-------
Video/Chroma
switching
Section
300
Series
-------
Vertical
deflection
800
Series
-------
AC
input,
power
supply
circuits
400
Series
--~----
Horizontal
deflection
900
Series
-------
CRT
Driver
Section
3.ABBREVIATION
ABCL:
Automatic
Brightness
Contrast
Limiting
LLD
:
Low
Level
Detector
ABL
:
Automatic
Beam
Limiting
LPF
:
Low
Pass
Filter
AC
_
:
Alternating
Current
MTS
_
:
Multi
Television
Sound
ACC
:
Automatic
Color
Control
NFB
:
Negative
Feed Back
AFC.
:
Automatic
Frequency
Control
NTSC:
National
Television
System
Comittee
System
AFT.
:
Automatic
Fine
tuning
NVRAM
:
Non-Valatile
Random
Access
Memory
AGC
:
Automatic
Gain
Control
PAL
:
Phase
Alternating
by
Line
System
AM
_
:
Amplitude
Modulation
PCM
—
:
Pulse
Coded
Modulation
APC.
:
Automatic
Phase
Control
PIF
:
Picture
Intermediate
Frequency
APL:
Average
Picture
Level
PLL
:
Pulse
Locked
Loop
AVC:
Automatic
Volume
Control
PWM
__
:
Pulse
Width
Modulation
DB
_
:
Decibel
RAM
_
:
Random
Access
Memory
DC
_
:
Direct
Current
RF
:
Radio
Frequency
DIP:
Dual-in-line
Package
SAW
_
:
Surface
Acoustic
Wave
DY
_
:
Defiection
York
SIF
:
Sound
Intermediated
Frequency
D/A
_
:
Digital
to
Analog
S/N
:
Signal
Noise
F.B
:
Fast
Blanking
PC
:
Inter
Intergrated
Circuit
FBT
:
Flyback
Trans
DAC
_
:
Digital
Analog
Convertor
FM.
;
Frequency
Modulation
BPF
:
Band
Pass
Filter
HDT
:
Horizontal
Drive
Trans
OSD
_
:
On-Screen
Display
iC
_—_:
Integrated
Circuit
“SCL:
Serial
Clock
Line
IF
—:
Intermediate
Frequency
:
SDA
_
:
Serial
Data
Line
IFT
-:
intermediate
Frequency
Trans
oe

: |For Safe Use ees Silt de de ble tenets
1. Read all of these instructions.
2.
Save
these
instructions
for
later
use.
3.
Unplug
this
television
receiver
from
the
wall
outlet
before
cleaning.
Do
not
use
liquid
or
aerosol
for
cleaning.
4. Do not use attachments not recommended by the
television receiver manufacturer as they may cause
hazards.
5.
Do
not
use
this
television
receiver
near
water
for
example,
near a
bathtub,
washbow,,
kitchen
sink,
or
laundry
tub,
ina
wet
basement,
or
near
a
swimming
pool,
etc.
6.
Do
not
place
this
television
receiver
on
an
unstable
cart,
stand,
or
table.
If
the
television
receiver
falls,
it
may
cause
serious
injury
to
a
child
or
an
adult,
and
serious
damage
to
the
appliance.
Use
only
with
a
cart
or
stand
recommended
by
the
manufacturer,
or
sold with
the
television
receiver.
Wall
or
shelf
mounting
should
follow
the
manufacturer's
instructions,
and
should
use
a
mounting
kit
approved
by
the
manufacturer.
a
.
Slots
and
openings
in
the
back
and
bottom
of
the
cabinet
are
provided
for
ventilation,
and
to
insure
reliable
operation
of
the
television
receiver
and
to
protect
it
from
overheating.
These
openings
must
not
be
blocked
or
covered.
The
openings
should
never
be
blocked
by
placing
the
television
receiver
in
a
built-in
installation
such
as
a
bookcase
unless
proper
ventilation
is
provided.
.
This
television
receiver
should
be
operated
only
from
the
type
of
power
source
indicated
on
the
marking
label.
If
you
are
not
sure
of
the
type
of
power
supplied
to
your
home,
consult
your
television
dealer
or
local
power
complany.
For
television
receivers
designed
to
be
operated
from
battery
power
refer
to
the
operating
instructions.
N
co
9.
This
television
receiver
is
equipped
with
a
polarized
alterating-current
line
plug(a
plug
having
one
blade wider
than
the
other.)
This
plug
will
fit
the
power
outlet
only
one
way.
This
is
a
safe
feature.
if
you
are
unable
to
insert
the
a
__
plug
fully
into
the
outlet,
try
reversing
the
plug.
If
the
plug
still
doesn't
fit,
contact
your
electrician
to
replace
your
obsolete
outlet.
Do
not
defeat
the
safety
purpose
on
the
polarized
plug.
/
if
your
television
receiver
has
a
threewire
grounding-type
plug,
please
note
the
following.
This
television
receiver
is
equipped
with
a
3-wire
grounding
type
plug(a
plug
having
a
third(grounding)
pin).
This
plug
will
only
fit
into
a
grounding
type
power
outlet.
This
is
a
safe
feature.
If
you
are
unable
to
insert
the
plug
into
the
outlete,
contact
your
electrician
to
replace
your
obsolete
outlet.
Do
not
defeat
the
safety
purpose
of
the
grounding
plug.
FIGURE 1.
EXAMPLE
OF
ANTENNA
GROUNDING
ACCORDING
TO
|
NATIONAL ELECTRICAL CODE INSTRUCTIONS
CONTAINED IN ARTICLE 810 -
“RADIO AND TELEVISION EQUIPMENT’
SECTIONS10-21(1)
NOTES :
a. Use No. 10 AWB(5.3mm2)
copper, No. 8 AWG(8.4mm2)
aluminum. No. 17 AWG(1.
Omm2) copperciad steel or
bronze wire, or larger, as a
apart.
c. Mount antenna discharge unit
as Close as possible to where
lead-inenters house.
Use jumper wire not smaller
2
ground
wire.
than
No.
6
AWG(13.3mm?)
b.
Secure
antenna
lelad-in
and
coppper,
or
the
equivalent,
groundwires to house with when a separate
stand-off
insulators
spaced
antennagrounding
electrode
from 4-6 feet(1.22-1.83m) is used.

{0. Do not allow anything to rest on the power cord. Do not
locate this television receiver where the cord will. be abused
by persons walking on it.
11.
Follow
all
warmings
and
instructions
marked
on
the
television
receiver.
12.
tf
an
outside
antenna
is
connected
to
the
television
receiver,
be
sure
the
antenna
system
is
grounded
so
as
to
provide
some
protection
against
voltage
surges
and
built
up
static
charges.
Section
810
of
the
National
Electrical
Code,
NFPA
No.
70-1975
provides
infomation
with
respect
to
proper
grounding
of
the
mast
and
supporting
structure,
grounding
of
the
lead-in
wire
to
an
antenna
discharge
unit,
size
of
grounding
conductors,
location
of
an
antenna
dicharge
unit,
connection
to
grounding
électrodes,
and
requirements
for
the
grounding
electrodes.
See
Figure
1.
13. For added protection for this television receiver during a
lightening storm, or when it is unattended and unused for a
long period of time, unplug it form the wall outlet and
disconnect the antenna. This will prevent the receiver from
damages due to lightning and power-line surges.
14. An outside antenna system should not be located in the
vicinity of overhead power lines, other electric light, power
circuits, or where it can fall into such power lines or circuits.
When installing an outside antenna system, extreme care
should be taken to keep from touching such power lines or
Circuits as contact with them might be fatal.
15. Do not overload wall outlets and extension cords as this
can result in a fire or an electric shock.
16. Never push any kinds of objects into this television receiver
through cabinet slots as they may touch dangerous voltage
points or short out parts that could result in a fire or an
’ electric shock. Never spill any kinds of liquid on the
television receiver.
17. Do not atempt to service this television receiver yourself as
opening or removing covers may expose you to dangerous
voitage or other hazards. Refer all service to a qualified
service personnel.
18. Unplug this television receiver from the wall-outiet and refer
service to a qualified service personnel under the follwing
conditions:
a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the television receiver.
c. If the television receiver has been exposed to rain or
water.
d. If the television receiver does not operate normally by
following the operating instructions. Adjust only those
controls that are covered by the operating instructions as
improper adjustment of other controls may resuit in
damage and will often requir extensive work by a
qualified technician to restore the television receiver to
the normal operation.
e. If the television receiver has been dropped or the cabinet
has been damaged.
f. When the television receiver exhibits a distinct change in
perfomance, this indicates a need for service.
19. When replacement parts are required, be sure the service
technician has used the replacement parts specified by the
manufacturer that have the same characteristics as the
original part. Unauthorized substitutions may result in a fire,
an electric shock, or other hazards.
20. Upon completion of any service or repairs to this television
receiver, ask the service technician to perform routine
safety checks to determine that the television is in safe
operating condition.
21. Television equipment and car combination should be
moved with care. Quick stops, excessive force, and uneven
surfaces may cause the equipment and cart combination to
overtum.

3-POWER
SUPPLY
SECTION...
__-
1.BLOCK-DIAGRAM
2.INTRODUCTION
The
1C
SDH209B
controls
the
bipolar
switching
transistors
and
performs
all
necessary
regulation
and
function
in
free
running
flyback
converters.
The
flyback
converter
is
the
most
cost
saving:
SMPS
for
CTV
and
VCR.
But
as
the
frequency
goes
up
according
to
the
increase
of
the
input
AC
voltage
and
the
reduction
of
power
consumption
an
abnormal
oscillation
like
intermittent
oscillation
or
over
voltage
can
happen
easy
unless
the
frequency
rise
is
restrained.
SDH209B
having
a
built-in
mono-multi
vibrator
which
is
triggered
at
transistor
switched
off
and
generates
a
pulse
of
constant
width
to
keep
the
transistor
off
for
the
pulse
period,
will
keep
switching
frequency
less
than
120KHz.
SDH209B
having
a
built-in
constant
DC
current
source
will
achieve
the
small
drive
power
consumption
at
higher
AC
input
and
achieve
the
sufficient
drive
current
at
lower
AC
input.
Owing
to
the
above
two
built-in
circuits,
SDH209B
can
get
good
regulation
and
high
efficiency
over
a
wide
AC
input
range
and
keep
stable
oscillation
at
very
small
load.
29%
In
the
standard
connections,
the
constant
voltage
charged
up
at
the
capacitor
is
used
and
also
used
to
sense
voltage.
So,
the
transformer
and
circuit
are
both
simple.
Free
running
frequency
of
flyback
converter
is
expressed
by
the
following
formula.
1 Vin
f="o-Lp-
PIN
4,
88
VIN
\2
as ee
< np Vo
where, Lp : Primary inductance
Pin : Input power
ns : Secondary winding turns
BV np : Primary winding turns
Vin : Input DC voltage
Vo : Output DC voltage
As
the
above
formula,
the
frequency
f
goes
up
acc-
ording
to
the
increase
of
Vin
and
the
decrease
of
Pin.
Mono-multi
vibrator
built-in
SDH209B
restrains
the
rise
of
switching
frequency.
This
mono-multi
vibrator
generates
4zsec
pulse
every
end
of
Ton
period.
That
is,
this
mono-multi
vibrator
is
triggered
by
signal
which
is.
produced
when
the:transistor
is
switched
off.
The
transistor
is
unable
to
be:
switched
on
again
while
the
mono-multi
vibrator's
output
is
high.
While
the
transistor
is
off,
the
primary
inductance
of
transformer
and
the
floating
capacitance
or
capacitor
installed
across
the
snubber
diode
compose
a
resonant
loop
and
oscillate.
This
resonant
frequncy
depends
on
the
primary
industance
and
capacitance.
When
4usec
over,
the
transistor
is
released
to
be
switched
on
again.
The
time
of
switch
on
is
app-
roximately
4#sec
plus
half
cycle
of
resonant
frequency
from
the
time
of
switch
off.
Capacitors
installed
across
the
snubber
diode,
across
the
secondary
diodes
and
across
C-E
of
the
transistor
affect
to
the
resonant
frequency.
In
order
to
obtain
the
stable
stand-by
oscillation,
a
total
equivalent
capacitance
is
recommended
to
be
less
than
330pF.
Total
equivalent
capacitance
Ceq
is
calculated.
2 2
Ceq
=Csn.+
Sce+
Cae
oe)
np np

where, Csn: Across the snubber diode
Cce : Across C-E of the transistor
np: Primary winding turns
ns: : Secondary winding S: turns
nsz : Secondary winding Sz turns
Cs: : Across the diode of S:
. Cs2 : Across the diode of S2
Remarks : Capacitance includes a diode junction
capacitance and a floating capacitance. Oscillation at
no load is stable and its power loss is small because of
the above mechanism.
Operation of Over Load
The formula of frequency f shows that f goes down
when Vo is smaller than the rated value. When the
switch is turned on, Vo starts from zero.
Therefore, the ordinary SMPS_ makes the whistle
sound when starting up. ,
But, Ton. limiter built-in SDH209B limits Ton duration
regardless of Vo value.
So, no whistle is made at starting up.
- This Ton limiter also works as a protector when the
transistor is switching at the overload. Particularly
when the input AC voltage is lower than the rated
value, Ton becomes longer and the saturation loss
increases. But Ton limiter stops becoming longer and
protect the transistor from thermal.run away.
Operation at Output Short
When the input AC voltage is higher than 220V. Ton
limiter is not enough to protect the transistor from the
over current. So, the current limiter is provided.
The instantaneous locus at the output short has not
been taken clear in the picture. But the locus is
expanded to 680V and 3.8A. Therefore, transistor’s
SOA is required bigger than this point. When the
output short is further continued, the locus becomes
shrinked and even a dead short will not destroy the
transistor. _
Because the constant DC current source for base
drive is empty due to the dead short and then the
transistor does not switch at a large current.
Transformer
1)Primary and Secondary Turn Ratio
The value of (Np/Ns) - Vo is factor to determine
switching duty, Ic peak, Vce peak and frequency.
The recommended value is like the below
"p
Re Vo = 220
2)Leakage Inductance
The recommended value is 1% of the primary indust-
ance.
3)Magnetic Saturation Current
The recommended value is bigger than,
4x 10-3 ‘ 0.6
LP r
Where, Lp : Primary inductance (H)
r : Current sense resistor (Q)
3.1C SPECIFICATION (SDH209B)
1)Block-Diagram
TON Limiter Fol
Regulator
® ®@ ®@ ©O© @ ©
2)Electrical Characteristics (Ta=25 Cc)
Para- Symbol Ratings
Meter (unit) | min | TYP | MAX
co pol se
Voltage o Vi
roe
Range Pin1-2
9.1
Remarks
Current
protection Vg (V)

49
47
48
12
45
4.
CHROMA,
VIDEO,
IF,
SOUND,
DEFLECTION
SECTION
4.1C
SPECIFICATION
(TDA8362)
4)introduction
a) General Description
Vision
IF
amplifier,
video
demodulator,
video
amplifier,
AGC
and
AFC
are
suitable
for
both
negative
and
positive
modulation.
Sound
limiter,
demodulator
and
amplifier
with
volume
control.
Inputs
and
switches
for
external
audio
and
CVBS
signals.
Synchronization
circuit
with
drive
circuits
for
horizontal
and
vertical
deflection.
Separate
supply
pin
for
starting
the
horizontal
oscillator
from
the
main
rectifier.
X-ray
protection
(combined
with
the
2°¢
phase
detector
pin).
PAL/NTSC
colour
decoder
in
which
the
chroma
filters
(bandpass
and
trap)
and
the
luminance
delay
line
have
been
integrated.
The
circuit
has
a
separate
chroma
input
and
the
filters
can
be
switched-off
so
that
S-VHS
signals
(via
an
external
switch)
can
be
applied
to
the
IC.
For
SECAM
applications
an(alignment-free)
SECAM-
decoder
can
be
added
to
the
IC.
Peaking circuit in the luminance channel.
_
RGB-output
circuit
with
linear
inputs
for
On-Screen
2)Block-Diagram
Character Display.
The supply voltage for the IC is 8 Volts. It is mounted in an
S-DIL envelope with 52 pins.
b)Features
- Multi-standard vision IF circuit
(positive and negative modulation)
-
Multi-standard
FM
sound
demodulator
(4.5MHz
to
6.5
MHz)
- Video and audio switches
(CVBS intext, S-VHS and audio int/ext)
- Integrated chroma trap and bandpass filters
(auto-calibrated)
- Luminance delay line integrated
-
PAL/NTSC
colour
decoder
with
automatic
search
system
-
Easy
interfacing
with
the
TDA
8395
(SECAM
decoder)
for
multi-standard
applications.
-
RGB-control
circuit
with
linear
RGB
inputs
and
fast
blanking
-
Horizontal
synchronization
with
two
control
loops
and’
an
alignment-free
horizontal
oscillator
Vertical
count-down
circuit
and
a vertical
pre-amplifier
- Low dissipation (only 600 mW)
-
Smali
amount
of
peripheral
components
compared
with
completion
IC's.
- Only one adjustment (vision IF demodulator)
DECOUPLING
Ld H: FLYB.
50
51
6
{1
40
a
[yi
“SANDC.
———eEE
I
GNC
+
8V
GND
—
e
[AUDIO
PRE
-
SYNC
VCO
+
ae
DET.
AMPL.
+
pone
SEPARATOR!
||
ena
OUTPUT
37
VOLUME PHASE DET. CONTROL H- ae
if De-emp. ref,
Si
+Mod.
42
switch
Mute = fs
Top | —- el
LF
+
VISION
IF
A
VERTICAL
HOR
+
VERT
4
TUNER
LIMITER/
SYNC
DIVIDER
pipes
||
AGC
DEMODULATOR
feece|
LINE
SEPARATOR
CIRCUIT
43
14
yess
11a
al
PEAKING
VISION
IF
RGBINPUT
{LR
i
PIETER
LUMINANCE
22
AMPLIFIERY
Fer
nates
+
DEMODULATOR
ule
OCESSING
Reg
outrur
|B
ti
_24
ie
ee
haa
Vee
cy
3}
SATURATION
RGB-MATRIX
20
cy
BANDPASS
CONTROL
+
—
+
ss
19
|
ees
|
G
-¥
MATRIX
RGB
ouTPuT
[LE
18
Ped 17
VIDEO
VIDEO
ero
oo
IDENT
WITCH
25
SWITCH
=I,
CONTROL
EAE
DECODER
LIMITER
30 131
-5-
levy pm] fe |
33134
35° 32 28
“A26 “A27

3)Pin Function
Audio deemphasis
iF-demodulator tuned circuit
IF-demodulator tuned circuit
Video indentification output
Sound IF in plus volume control
External audio input
IF video output
Decoupling digital supply
Ground
Positive supply (8 V)
Ground
Decoupling filter tuning
Internal CVBS input
Peaking control input
External CVBS input
Chroma + A/V switch input
Brightness control input
B-output
G-output
R-output
RGB-insertion and blanking input
R-input for insertion
G-input for insertion
B-input for insertion
Contrast control input
Saturation contro! input
OONOAO AWD
2.CHROMA VIDEO SECTION
1)Block-Diagram
4.43MHz & ni
TDA8&362
27 SHRY) 3148-Y) BEY) BRY)
Reference chroma
L: PAL
'H:SECAM
1 16 g
SECAM
Oecorder
ToAss95 —-10
2)Actuating Description
- Colour Decoder
The colour decoder contains an alignment-free X-tal
oscillator, a dual killer circuit and the colour difference
signals demodulators. The decoder adapts automatically
for PAL and NTSC signals. Two X-tal pins are present so
no external switching is required. With the SECAM add-
on decoder TDA8395 an alignment free multi-standard
26
[ee [Fanon
Decoupling bandgap supply
Decoupling sound demodulator
Audio output
Tuner take-over adjustment
AGC decoupling capacitor
Tuner AGC output
IF-input
IF-AFC output
AFC output
Vertical output
Vertical ramp generator
Vertical feedback input
@ -1 loop filter
@ 1- loop filter
Flyback input / sandcastle output
Horizontal output
Start horizontal oscillator
4.43MHz X-tal connection
3.58MHz X-tal connection
Loop filter burst phase detector
4.43MHz output for TDA 8395
B-Y output signal
R-Y output signal
R-Y input signal
B-Y input signal
Hue control input (or chroma out)
decoder can be built with an automatic selection. This
makes the application of the TDA8362 very flexible. The
following applications are possible:
~ PALISECAM:
In this application pin 27 is not used for Hue-control but
for the chroma signal for the SECAM add-on circuit. Pin
27 has to be connected to the supply line 8V via a series
resistor of 10k2. Together with the alignment-free SECAM
add-on circuit TDA8395 a PAL/SECAM decoder is
realized.
The burst phase detector locks the X-tal oscillator with the
burst signal. Two gain modes provide an increased
catching range when the PLL is unlocked and a low ripple
voltage and a good noise immunity when the PLL is
locked.
The burst phase detector operates. during the burst key
period only, to prevent the PLL from being disturbed by
the chroma signal.
The killer circuit switches off the R-Y and B-Y
demodulators at too low input signal condition (burst
amplitude). Proper hysteresis prevent the constant on/off
switching at a certain input level.

3)IC
Block-Diagram
(TDA8362)
aK
SECAM
interface
Chroma
SECAN reference!
Communication
Gated amplifier
34 PAL ident
Level.detector.
KX
PAL killer
level detoctor
D.C.detector
Hue control input
or
Chroma output
-(B-Y)
Demodulato
Sample NTSC killer
-(B-Y)
Demodulator
hae
level
detector
aK
ASM
ee HP Filter
I
{8-Y) +4R-Y)
output
signal
output
signal
4)IC
Specification
(TDA8395)
a)introduction
The
TDA8395
is
an
alignment-free
SECAM
colour
decoder
‘and
can
be
used
in
conjunction
with
the
TDA8362.
It
includes
the
Cloche
filter,
demodulator
and
identification
circuit.
The
TDA8395
application
needs
very
few
external
components,
the
deemphasis
is
internally
calibrated.
The
cloche
filter
is
a
gyrator-capacitor
type
filter.
Its
resonance
frequency
is
controlled
during
the
calibration
period
and
offset
during
scan
for
the
right
resonance
frequency.
The
required
reference
frequency
for
calibration
must
be
connected
at
pin
1
and
is
obtained
from
the
TDA8362
(pin
32).
The
two(or
three)-level
sandcastle
pulse
has
to
be
connected
at
pin
15
(TDA8362
pin38)
and
is
used
for
b)Block-Diagram
T
BANDGAP
' VIDEO
100N
aie
aca
CONTROL
ha
¥
SWITHING
blanking
periods
and
provides
the
clock
information.
for
the
identification
circuit.
The
chroma
signal
at
pin
16
connected
to
pin
27
of
TDA8362,
is
demoduleted
by
a
PLL
demodulator,
which
uses
the
reference
frequency
and
a
bandgap
reference
to
force
the
PLL
to
the
desired
demodulation
characteristic.
Digital
line
identification
is
implemented
to
check
the
incoming
signal
for
SECAM.
If
SECAM
is
detected,
pin
1
will
sink
a
current
of
1504A.
Together
with
the
TDA8362
the
voltage
at
this
pin
will
become
high
(5.5V).
In
this
case
the
colour
difference
signal
outputs
will
be
switched
on.
These
outputs
will
be
disconnected
and
the
high-
ohmic
when
no
SECAM
is
detected
for
two
frame
periods,
the
demodulator
will
be
initialized
before
trying
again.
100
Kee
.
PLL ‘ DEEMPHASIS|
* (DENT

c)Pin Function
No
frefIDENT | reference frequency inputidentification input
Vv
=
positive supply voltage
=) a
not connected
. : not connected
GND ground
7 | CLOCHEref| Cloche reference filter
PLLref PLL reference
- (R-Y) - (R-y) output
pa] co]
z
rE
16 | CVBS i i i
3 QO
video (chrominance) input
5)IC specification (TDA4661)
a)Introduction
The TDA4661 are integrated the baseband delay lines of
64S for colour television receivers. It can be connected
to the
b)Block-Diagram
+(R-Y) —4
colour-difference
input signals
+(B-Y) —-
Vp1
FREQUENCY
sand castle
pulse input
ey [eM aunt
TDA8362 and TDA8395 without the need of switches and
alignments. The TDA4661 consists of two main blocks:
-Two comb filters with a delay time of 64 sec in switched
capacitor technique.
-Internal clock generation of 3MHz, line locked via the
sandcastle pulse.
The TDA4661 operates according to the mode demanded
by the colour transmission standard. In the PAL mode it
operates as a geomentric adder to satisfy the
requirements of PAL demodulation, in the NTSC mode it
reduces the cross-colour interference (comb-filtering) and
in the SECAM mode the delay line repeats the colour
difference signal on consecutive horizontal scan lines.
The colour difference signals are AC-coupled to pin 14
and 16 and clamped by the input stages. The internal
clock drives the delay lines to obtain the required 64%
sec. The clock pulses are derived from a 6MHz Current
Controlled Oscillator which is the line locked via a PLL
with the sandcastle pulse, connected at pin 5. Sample
and hold low pass filters suppress the clock signal. The
delayed and the un-delayed signals are added, buffered
and fed to the output pins 11 and 12.
SAMPLE
AND
+(R-Y)
addition output
stages buftfors
colour-difference
output aignals
rst fe| SUE
DETECTION
6 MHz DIVIDER
7 vco BY2
digital supply
+ (BY)

c)Pin Function
No
Symbol
Function
Function
—{|—
po
Vp2
+8V
Supply
Voltage
for analogue part
ibe
~~ [48V Supply Voltage
for analogue part
ground for analog
part(OV)
+ (R-Y) output
signal
Vp
not connected GND1
ground
for
digital
VolRY)
'O
=
part(OV)
a
+
(B-Y)
output
ET
signal
internally connected
Sandcastle pulse |
,
not
connected
input
+ (B-Y) input
not
connected
;
signal
}
internally connected
es
internally connected
not connected
+ (R-Y) input
signal
3.1F SECTION
1)Block-Diagram
2202, 2203
Sound Trap
AGC-Adjustment
2)Actuating Description
a)iF amplifier
The
IF-amplifier
contains
3
AC-coupled
control
stages
with
a
total
gain
control
range
which
is
in
excess
of
60
dB.
The
sensitivity
of
the
circuit
is
comparable
with
that
of
modern
IF-IC's.
The
reference
carrier
for
the
video
demodulator
is
obtained
by
means
of
the
passive
regeneration
of
the
picture
carrier.
The
external
reference
tuned
circuit
is
the
only
remaining
adjustment
of
the
IC.
The
polarity
of
the
demodulator
can
be
switched
so
that
the
circuit
is
suitable
for
both
positive
and
negative
modulated
signals.
The
AFC-circuit
is
driven
with
the
same
reference
signal
as
the
video
demodulator.
To
avoid
that
the
video
content
-9-
disturbes
the
AFC
operation
a
sample-and-hold
circuit
is
applied.
The
capacitor
for
this
functions
is
internal.
The
AFC
output
voltage
range
is
6
Volts.
The
AGC-detector
operates
on
top-sync
or
top
white-level
depending
on
the
position
of
the
demodulator.
The
AGC
detector
time-constant
capacitor
is
connected
externally.
This
is
mainly
because
of
the
flexibility
of
the
application.
The
time-constant
of
the
AGC
system
during
positive
modulation
is
rather
longer
to
avoid
visible
variations
of
the
signal
amplitude.
To
obtain
an
acceptable
speed
of
the
AGC
system
a
circuit
has
been
included
which
detects
whether
the
AGC
detector
is
activated
every
frame
period.
When
3
frame
periods
no
action
is
detected,
the
speed
of
the
system
is
increased.
The
circuit
contains
a
video
identification
circuit
which
is
independent
of
the
synchronization
circuit.
Therefore
the
search
tuning
is
possible
when
the
display
section
of
the
receiver
is
used
as
a
monitor.
The
ident
output
voltage
is
low
when
no
transmitter
is
identified.
In
that
condition
the
sound
demodulator
is
switched
off
(mute
function).
When
a
transmitter
is
identified,
the
voltage
is
high.
The
voltage
level
is
dependent
on
the
frequency
of
the
incoming
chroma
signal.
b)AGC
Tuner
AGC
and
AFC
The
A.G.C.
detector
operates
at
top-sync
level
for
signals
with
negative
modulation
and
at
peak-white
level
for
positive
modulated
signals.
This
A.G.C.
detector
is
gated
for
negative
modulated
signals
to
reduce
the
sensitivity
of
impulsive
noise.
The
time
constant
capacitor
(C117)
is
connected
externally
at
pin
48.
For
positive
modulated
signals
the
A.G.C.
time
constant
is
long
to
avoid
visible
variations
of
the
video
output
signal.
To
obtain
an
acceptable
A.G.C.
speed
with
positive
modulation
an
extra
circuit
checks
whether
the
A.
G.C.
detector
is
activated
every
frame
period.
The
speed
will
be
increased
if
this
circuit
detects
that
the
video
output
signal
has
not
reached
80%
of
peak
white
level
for
approximately
100msS.
The
tuner
AGC
take-over
point
can
be
set
by
adjusting
the
DC-voltage
at
pin
49,
with
a
potentiometer
of
10
x0
(VR101).

The tuner A.G.C. (pin 47) is an open collector output
stage with an output swing of 2mA min. The voltage
swing,required by the tuner, can be obtained with an
external resistor network, connected at pin 47. Pin 47 may
rise 2V above the actual supply voltage, without damaging
the IC.
This feature simplifies the application, because most
3)IC Block-Diagram (TDA8362)
Ref-circuit
if amplifier
OverLoad
AGCkey
4.SOUND SECTION
1)Block-Diagram
EUROPE AREA , }
option bat
: H:ext
pocfewseve-penes
Z101
SAW FILTER
2201,2202,
2203
SOUND TRAP
Se
Video Identificalion
tuners require a 9V A.G.C. voltage level for min. gain.
The A.F.C. circuit is driven by the same reference signal
as the video demodulator.A sample and hold circuit
avoids video break-through from the video demodulator to
the A.F.C. voltage. The A.F.C. output voltage range is
from 0 to Vcc, the stepness of the A.F.C. slope can be
influenced by resistors R114 and R115.
Video buffer
S&H gate
AFC
output
ident
Colour info
coincidence
VIDEX
2)Actuating Description
The sound bandpass and trap filters have to connected
externally. For automatic system converting,the filtered
inter carrier signal is fed to TA8710S (sound converter IC).
The inputed sound signal is converted to 6.0MHz singnal.
The converted sound signal is fed to alimilter circuit and is
demodulated by means of a PLL demodulator. This PLL
circuit itself tunes automatically to the incoming signal so
that no adjustment is required, In case of NTSC, Sound
signal is filtered to 4.5MHz BPF. The filtered intercarrier
_signal is fed to pin 5 of TDA8362.
The volume is the DC-controlled. The composite audio
output signal has the amplitude of 700mV RMS at
maximum volume control setting. The deemphasis
capacitor has to be connected externally. The non-
controlled audio signal can be obtained from this pin (via a
buffer stage). The amplitude of this signal is 350mV RMS.
The external audio input signai must have an amplitude of
350MV RMS. The audio/video switch is contolled via the
chroma input pin(pin16).

Audio input signal from an external source (RCA JACK)
withan amplitudeup to 350mVrms (+/- 6 dB) can be fedto pin 6.
The audio switch is controlled via the chroma input pin
16,
as
described
in
Chapter
2.1.8.
The
volume
control
operates upon the external audio input signal, when the
3)IC Block-Diagram (TDA8362)
Limiter PLL-Demodulator
4) IC Specification (TDA1013A)
a) Introduction
The
TDA1013A
is
a
monolithic
integrated
audio
amplifier
circuit
with
D.C.
volume
control
in
a
9-lead
single
in-line
(SIL)
plastic
package.
The
wide
supply
voltage
range
makes
this
circuit
very
suitable
for
applications
in
mains
fed
apparatus
such
as
television
receivers.
and
record
players.
The
D.C.
volume
control
stage
has
a
logarithmic
control
characteristic
with
a
range
of
more
than
80
dB;
control
can
be
obtained
by
means
of
a
variable
D.C.
voltage
between
3.5
and
8
V.
The
audio
amplifier
has
a
well
defined
open
loop
gain
and
a
fixed
integrated
closed
loop
gain.
This
offers
an
optimum
in
number
of
external
components,
performance
and
stability.
The
SIL
package
(SOT-110B)
offers
a
simple
and
low-
cost
heatsink
connection.
wets
TDA8362 is switched to the external mode.
When the TDA8362 is switched for video signals with the
positive modulation, the demodulated AM-sound signal
can be connected to the external audio input at pin 6
under the operation of the volume control. Me
POSMOD
Pre-amplifier
Deemphasis
External audio
or POSMOD
Volume control
Sound
output
Sound External
decoupling Audio
b)Block-Diagram

5, DEFELECTION SECTION
1)Block-Diagram
1C301
Vertical Drive
AN5512/KA2131
10101
TDA8362
V-Height
CONTROL
VR301 Feed back
Vertical
Ramp H - Phase
Generator VR401
C311
2)Actuating Description
The
incoming
video
signals,
pin
13
for
the
internal
signal
and
pin
15
for
an
external
CVBS
signal,.
are
fed
to
the
synchronization
separator
circuit.
Internally
the
black
level
and
the
top
sync.
level
are
detected,
next
the
—
synchronization
pulses
are
amplified
to
a
fixed
level
and
sliced
at
50%
of
that
level.
In
this
way
a
very
good
synchronization
performance
is
obtained.
The
separated
synchronization
pulses
are
fed
to
the
first
phase
detector
circuit
and
to
the
coincidence
detector.
The
components
which
determine
the
loop
gain
of
the
first
phase
detector
are
connected
at
pin
40
(C401,
C402
and
VR401).
The
coincidence
detector
is
only
used
to
detect
whether
the
line
oscillator
is
synchronised,
not
for
transmitter
identification.
The
line
oscillator
is
running
at
twice
the
line
frequency
and
is
derived
from
the
X-tal
oscillator
frequency
of
the
colour
decoder,
consequently
no
adjustment
is
required.
The
free-running
frequency
has
a
maximum
deviation
of
2%
compared
to
the
nominal
frequency.
;
The
second
phase
detector
generates
the
pulses
for
the
horizontal
driver
stage
(pin
37).
4s
+125V
H voitage
Focus.v
Screen.V
+ 180V
FBT
1444 + 24V
+ 16.5V
Heater.V
DY
S-Correction
The
loop
filter
capacitor
(C404)
is
connected
at
pin
39.
Horizontal
shift
can
be
obtained
by
a
potentiometer
and
series
resistor
(R420
and
VR401)
connected
at
pin
39.
The
TDA8362
has
a
separate
start-up
circuit
for
the
horizontal
oscillator
(pin
36).
In
case
this
feature
is
used
for
starting
the
horizontal
deflection
the
resistor
connected
at
the
base
of
the
horizontal
driver
transistor
(Q401)
must
be
connected
to
the
start
supply
as
well
(pin
37
is
an
open
collector).
For
applications
which
do
not
require
a
start-up
function
pin
36
must
be
connected
to
the
main
supply
voltage
(8V).
The
vertical
drive
pulses
(pin
43)
are
generated
by
a
-
divider
circuit.
The
vertical
ramp
generator
components
are
connected
at
pin
42.
Capacitor
C311
is
charged
via
two
resistors,
one
resistor
connected
to
a
stabilized
supply
voltage
(R313).
In
this
way
the
vertical
amplitude
will
be
kept
constant
with
different
picture
contents.
AC and DC feedback voltage from the vertical deflection
stage must be connected at pin 41.

3)IC Block-Diagram (TDA8362)
FlyBack-in
sandcastle PHI-2
mi
PHI-1 Horizontalt- PHI-2 37 ft Horizontal
i detector | Pfescitae a2 detector drive
Start-supply PBI-1
CVBS- Video clamp/gain
inpulse switches conver:
internat 2 13-—
External 1 tds een
50/60Hz
generator
feedback
Vert ramp
generator
4)IC Specification (KA2131)
a)Introduction b)Block-Diagram
The KA2131 is a monolithic integrated circuit designed NC AMP voltage. Veo 24V
for the vertical output stage in color television receivers. Pe oe eo
_ FUNCTIONS Verical Sawtooth (6) Flyback
input (Vertical stage stage generator Fly
OSC
Signal)
Back
e
Driver
stage.
(7)
e Output stage.
e Flyback generator.
e Pulse shaper.
) @) 2)
-
FEATURES
sie
Drive Output Vert Output
e Low power consumption, direct deflection coil driving
capability (Flyback voltage is supplied two times as high
as supply voltage during flyback period only).
e High breakdown voltage : 60V
213

5.REMOCON SECTION
4.INTRODUCTION
CTV340S(SPM 1098) is a low cost television receiver
control system bases on the PCA84C641 microcontroller.
It is a voltage synthesis tuning (VST) system which can
be used all over the world. All relevant control functions of
the system are displayed via the on-screen display
circuitry of the microcontroller. Herewith two independent
lines of 16 characters with 4 different sizes and in 7
different colours can be displayed. All analogue picture
settings are controlled with 4 on-chip digital to analogue
convertors. The fifth digital to analogue converter can be .
used for volume in a mono-only option, or full sound
(Voume, Bass, Treble, Balance) can be controlled in a
German Stereo and/or Nicam sound configuration. This
system is a colour standard independent.
A four page teletxt system, based on the IVT(SAA5246)
and display memory, can be controiled indirectly via a
second microcontroller. This offers the possibility of a
sophisticated teletext system with special features like
FASTEXT, TOP, LIST, packet X/26 decoding (for Spain
and Easten Europe).A minimum amount of software is
-14-
spent to transfer the teletxt commands fromthe remote
control to this special teletext controller.A second option is
a system with no teletext at all.
The CTV340S(SPM109B) system fulfils a numerous and
varied requirements and has options to make it. applicable
to all markets.
- Definitions, acronyms and abbreviations.
ACC Analogue to Digital Convertor
Peri Peripheral TV signal source
CCT Computer Controlled Teletext decoder
DAC _ Digital to Analogue Convertor
PC Inter IC bus, 2-wire bidirectional multimaster bus
IDENT horizontal coincidence signal, transmitter IDENTification
NV-memory Non-Volatile memory
OSD On Screen Display
PP Personal Rreference, prefered analogue values
RC-5 Remote Control system, according RC-5 world standard
VST Voltage Synthesis Tuning
VTR Video Tape Recorder time constant
1VT Integrated VIP and Teletext
VIP Video Input Processor