Circuit DescriptionL01.1E AB9.EN 73
- 9.5 to 12 V: EXTERNAL 4:39.8Abbreviation list
SEL-MAIN-FRNT-RR This is the ?source select control?
signal from the microprocessor. This control line is under
2CS2 Carrier (or Channel) Stereo
user control or can be activated by the other two control
ACIAutomatic Channel Installation:
lines.
algorithm that installs TV sets directly
from cable network by means of a
9.7.6 Power Supply Controlpredefined TXT page
ADCAnalogue to Digital Converter
The microprocessor part is supplied with 3.3 V and 3.9 V both AFCAutomatic Frequency Control: control
derived from the ?MainAux? voltage via a 3V3 stabiliser (7560) signal used to tune to the correct
and a diode.frequency
Two signals are used to control the power supply:AFTAutomatic Fine Tuning
Stdby_con This signal is generated by the microprocessor AGCAutomatic Gain Control: algorithm that
when over-current takes place at the ?MainAux? line. This is controls the video input of the
done to enable the power supply into standby burst mode, featurebox
and to enable this mode during a protection. This signal is AMAmplitude Modulation
?low? under normal operation conditions and goes to ?high? APAsia Pacific
(3.3 V) under ?standby? and ?fault? conditions.ARAspect Ratio: 4 by 3 or 16 by 9
POWER_DOWN This signal is generated by the power ATSAutomatic Tuning System
supply. Under normal operating conditions this signal is AVExternal Audio Video
?high? (3.3 V). During ?standby? mode, this signal is a pulse AVLAutomatic Volume Level
train of approx. 10 Hz and a ?high? duration of 5 ms. It is BC-PROTBeam Current Protection
used to give information to the UOC about the fault BCLBeam Current Limitation
condition in the Audio amplifier supply circuit. This B/GMonochrome TV system. Sound
information is generated by sensing the current on the carrier distance is 5.5 MHz
?MainAux? line (using voltage drop across R3564 to trigger BLC-INFORMATIONBlack current informationrmation
TS7562). This signal goes ?low? when the DC-current on BTSCBroadcast Television Standard
the ?MainAux? line exceeds 1.6 - 2.0 A. It is also used to Committee. Multiplex FM stereo sound
give an early warning to the UOC about a power failure. system, originating from the USA and
Then the information is used to mute the sound amplifier to used e.g. in LATAM and AP-NTSC
prevent a switch off noise and to solve the switch-off spot.countries
B-TXTBlue teletext
9.7.7 Tuner IFCCClosed Caption
ComPairComputer aided rePair
CRTCathode Ray Tube or picture tube
Pin 3 of the UOC (SEL-IF-LL?_M-TRAP), is an output pin to
CSMCustomer Service Mode
switch the SAW-filter to the appropriate system.
CTIColour Transient Improvement:
If UOC pin 3 is ?low?, the selected system is:
manipulates steepness of chroma
- West Europe: PAL B/G, I, SECAM L/L?
transients
- East Europe: PAL B/G
CVBSComposite Video Blanking and
- Asia Pacific: NTSC M
Synchronisation
If UOC pin 3 is ?high?, the selected system is:
DACDigital to Analogue Converter
- West Europe: SECAM L?, L?-NICAM
DBEDynamic Bass Enhancement: extra
- East Europe: PAL D/K
low frequency amplification
- Asia Pacific: PAL B/G, D/K, I
DBXDynamic Bass Expander
D/KMonochrome TV system. Sound
Note: For West Europe, two separate SAW filters (1002 and
carrier distance is 6.5 MHz
1004) are used for video and audio (Quasi Split Sound
DFUDirection For Use: description for the
demodulation). For East Europe, one SAW filter (1003) is used
end user
for both (Intercarrier demodulation).
DNRDynamic Noise Reduction
DSPDigital Signal Processing
9.7.8 Protection Events
DSTDealer Service Tool: special remote
control designed for dealers to enter
Several protection events are controlled by the UOC: e.g. service mode
BC protection, to protect the picture tube from a too high DVDDigital Versatile Disc
beam current. The UOC has the capability of measuring EEPROMElectrically Erasable and
the normal back level current during the vertical flyback. So Programmable Read Only Memory
if for some reason the CRT circuit is malfunctioning (i.e. EHTExtra High Tension
high beam current), the normal black current will be out of EHT-INFORMATION Extra High Tension
the 75 ?A range, and the UOC will trigger the power supply informationrmation
to shut down. However, this is a high beam-current EUEurope
situation, the TV screen will be bright white before the set EWEast West, related to horizontal
is shut down.deflection of the set
I2C protection, to check whether all I2C IC's are EXTExternal (source), entering the set via
functioning.SCART or Cinch
In case one of these protections is activated, the set will go into FBLFast Blanking: DC signal
?standby?. The ?on? and ?standby? LEDs are controlled via the accompanying RGB signals
UOC.FILAMENTFilament of CRT
FLASHFlash memory
FMField Memory
FMFrequency Modulation
HAHorizontal Acquisition: horizontal sync
pulse coming out of the HIP |
ACEC
