Circuit Descriptions, Abbreviation List, And Ic Data Sheets; Abbreviation List - Philips SK4.0A CA Service Manual

Circuit Descriptions, Abbreviation List, and IC Data Sheets

9. Circuit Descriptions, Abbreviation List, and IC Data Sheets
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Index of this chapter:
9.1 Introduction
9.2 The various circuits

9.3 Abbreviation List

9.4 IC Data Sheets
9.1 Introduction
The SK4.0A CA is a CRT TV for the year 2007, based on the
3P61 platform. In this chapter, only a general description of the
various circuits is given. For more detailed information, see the
circuit diagrams in this manual.
9.2 The various circuits
9.2.1 Tuner
The function of the tuner is to select the channel to be received
and suppress the interference of neighboring channels, to
amplify the high frequency signal, to improve the receiving
sensitivity and SNR, and to generate a PIF signal through
frequency conversion.
9.2.2 IF Channel
The IF Channel mainly ensures the sensitivity and selectivity of
the complete TV set. The IF AMP integrated in the UOCIII is
made up of a three-stage dual-differential amplifier with a gain
value above 70dB, a SNR of 55dB and a bandwidth of 7 MHz.
The video demodulation circuit is made from the built-in PLL
Sync Detector. The spectrum of the demodulation carrier is
unitary and it is not affected by the content of the video signal.
The tuner features stable receptivity while the signal output
from the video detector features high fidelity. The built-in PLL
circuit of the UOCIII generates a 38.0 MHz or 38.9 MHz
demodulation reference signal for the sync detector to
demodulate the video signal; this is called "PLL sync
demodulation".
9.2.3 Sound Channel
An external ceramic filter is used to select the second SIF
signal for the sound channel of UOCIII from the signal output of
the video detector. The audio signal is obtained after limiting
amplification and demodulation by the intermediate frequency
detector for the SIF signal, and then the audio signal is output
to the audio amplifier TFA9842., which drives the speakers to
provide the sound. The intermediate frequency detector and
volume-control attenuator that are built in the UOCIII are set
and adjusted via the CPU.
9.2.4 CRT Drive Circuit
In the driver circuit, both the voltage and current of the R/G/B
signal are amplified, after which the CRT drive circuit
modulates the cathode beam current of the CRT. The R/G/B
signal input into the driver circuit is of negative polarity.
9.2.5 Power Supply Circuit
The function of the power supply circuit is to supply various
stabilized operating voltages and to provide protections against
excessive voltages and currents.
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SK4.0A CA
9.3 Abbreviation List
2CS
A2
AC
ACI
ADC
AFC
AGC
AM
ANC
AP
AR
AV
AVL
B/G
BCL
CBA
CFR
ComPair
CRT
CVBS
CVI
D/K
DAC
DC
DC-filament
DFU
DPL
DRAM
DVD
EEPROM
EHT
EMI
EU
EW
EW-DRIVE
EXT
FBL
FE
Field
Filament
FM
Frame
FTV
9. EN 35
2 Carrier Sound
Commonly known as 2 Carrier Sound
(2CS) system
Alternating Current
Automatic Channel Installation:
algorithm that installs TV channels
directly from a cable network by
means of a predefined TXT page
Analogue to Digital Converter
Automatic Frequency Control: control
signal used to tune to the correct
frequency
Automatic Gain Control: algorithm that
controls the video input of the feature
box
Amplitude Modulation
Automatic Noise Reduction; One of
the algorithms of Auto TV
Asia Pacific
Aspect Ratio: 4 by 3 or 16 by 9
Audio Video
Automatic Volume Level control
Monochrome TV system. Sound
carrier distance is 5.5 MHz
Beam Current Limiter
Circuit Board Assembly (or PWB)
Carbon Film Resistor
Computer aided rePair
Cathode Ray Tube (or picture tube)
Composite Video Blanking and
Synchronisation
Component Video Input
Monochrome TV system. Sound
carrier distance is 6.5 MHz. D= VHF-
band, K= UHF-band
Digital to Analogue Converter
Direct Current
Filament supply voltage
Directions For Use: owner's manual
Dolby Pro Logic
Dynamic RAM; dynamically refreshed
RAM
Digital Versatile Disc
Electrically Erasable and
Programmable Read Only Memory
Extreme High Tension; the voltage
between the cathode and the shadow
mask that accelerates the electrons
towards the screen (around 25 kV)
Electro Magnetic Interference;
Leakage of high-frequency radiation
from a transmission medium
EUrope
East West, related to horizontal
deflection of the set
East -West correction drive signal.
EXTernal (source), entering the set by
SCART or by cinches (jacks)
Fast Blanking: DC signal
accompanying RGB signals
Front End; Tuner and RF part together
Each interlaced broadcast FRAME is
composed of two Fields, each Field
consists of either Odd or Even lines
Filament of CRT
Field Memory / Frequency Modulation
A complete TV picture comprising all
lines (625/525)
Flat TeleVision