akira CT-21CBP5CP, Руководство по обслуживанию

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Model no.: .CT-21CBP5CP.doc
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SERVICE DATA
1. KEY ICs TECHNICAL DATA
1.1 Microcontroller and small signal processor TDA935X/6X/8X
The super chips TDA935X/6X/8X are good in pins compatibility. Differences among them are
shown as follows.
TDA 9351 (48K) PAL/NTSC/SECAM+1 PAGE TELETEXT
TDA 9350 (48K) PAL/NTSC+PAGE TELETEXT
TDA 9361 (64K) PAL/NTSC/SECAM+10 PAGE TELETEXT
TDA 9360 (64K) PAL/NTSC+10PAGE TELETEXT
TDA 9380 (32K) PAL/NTSC
TDA 9387 (32K) NTSC
TDA935X/6X/8X PS/N2 series TV signal processor-Teletext decorder with
emberdded-Controller
1)General Description
The various versions of the TDA935x/6x/8x PS/N2 series combine the functions of TV signal
processor together with a – 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
paage text.. The ICs are intended to be used in economy television receiver with 90 and 110
picture tubes. The ICs have supply voltages of 8V and 3.3V aand they are mounted in S-DIP
envelope with 64 pins.
The features are given in the following feature list. The differences between the various ICs are
given in the table on page 4.
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 intercarrier sound FM demodulator
and versions with QSS IF amplifier.
•
The mono intercarrier 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 chrominance 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 switchable centre frequency
•
O nly one reference (12 MHz) crystal required for the Controller, Teletext- and the colour
decoder
•
PAL/NTSC or multi-standard colour decoder with automatic search system