akira CT-14XA9A, Руководство по обслуживанию

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Model No: CT-14XA9A
Version 1.0
SERVICE DATA
Technical Data of Key ICs
1 Micro controller and small signal processor TDA935X/6X/8X
The super chips TDA935X/6X/SX are good in pins compatibility. Differences among them are
shown as follows.
TDA9351(48K) PAL/NTSC/SECAM+I PAGE TELETEXT
TDA9350(48K) PAL/NTSC+I PAGE TELETEXT
TDA9361 (64K) PAL/NTSC/SECAM+10 PAGE TELETEXT
TDA9360(64K) PAL/NTSC+10 'PAGE TELETEXT
TDA9380 ( 32K ) PAL/NTSC
TDA9387 ( 32K ) NTSC
(1) General Description
The various versions of the TDA935X/6X/8X PS/N2 series combine the functions of a TV
signal processor together with a Ix-Controller and US Closed Caption decoder. Most versions
have a Teletext decoder on board. The Teletext decoder has an internal RAM memory for 1 or
10 pages text.
The ICs are intended to be used in economy television receivers with 90° and 110
o
picture
tubes.
The ICs have supply voltages of 8 V and 3.3 V and they are mounted in S-DIP envelope with
64 pins. The features are given in the following feature list.
(2) Features
TV-signal processor
•
Multi-standard vision IF circuit with alignment-free PLL demodulator.
•
Internal (switchable) time-constant for the IF-AGC circuit
•
A choice can be made between versions with mono inter carrier sound FM demodulator
and versions with QSS IF amplifier.
•
The mono inter carrier sound versions have a selective FM-PLL demodulator which can
be switched to the different. FM sound frequencies (4.5/5.5/6.0/6.5 MHz). The quality of
this system is such that the external band-pass filters can be omitted.
•
Source selection between "internal" CVBS and external CVBS or Y/C signals
•
Integrated chrominanee trap circuit
•
Integrated luminance delay line with adjustable delay time
•
Picture improvement features with peaking (with variable centre frequency and
positive/negative overshoot ratio) and black stretching
•
Integrated chroma band-pass filter with switch able centre frequency
•
Only one reference (12 MHz) crystal required for the Ix-Controller, Teletext- and the
colour decoder
•
PAL/NTSC or multi-standard colour decoder with automatic search system
•
Internal base-band delay line
•
RGB control circuit with "Continuous Cathode Calibration', white point and black level
offset adjustment so that the colour temperature of the dark and the light parts of the
screen can be chosen independently.
•
Linear RGB or YUV input with fast blanking for external RGB/YUV sources" The
Text/OSD signals are internally supplied from the Ix-Controller/Teletext decoder
•
Contrast reduction possibility during mixed-mode of OSD and Text signals.