5
8. MICROCONTROLLER SDA545X
The device is a control system based on the SDA 545X TV microcontroller. It is designed for a low
cost mono TV-SET with analogue picture and sound control. Neverthless the system offers an on screen display (OSD) and
IR remote control of all functions.
SDA545X has the following features:
- Display of program number, channel number, TV standard, analogue values, sleep timer, parental control, and mute is done by OSD.
- Single LED for IR active, standby and on mode indication.
-
1 Control line to select external source.
- 3 Control lines for TV standard selection.
- Frequency synthesis tuning (62.5 kHz steps)
- 192 step fine tuning
- Channels corresponding to standards PAL M/N NTSC M
- Mono sound control by analogue voltage
- System configuration with service mode
9. SERIAL ACCESS CMOS 8K (1024*8) EEPROM ST24C08
The ST24C08 is a 8Kbit electrically erasable programmable memory (EEPROM), organised as 4 blocks of 256*8 bits.
The memory is compatible with the I²C standard, two wire serial interface which uses a bi-directional data bus and serial clock.
The memory carries a built-in 4 bit, unique device identification code (1010) corresponding to the I²C bus definition.
This is used together with 1 chip enable input (E) so that up to 2*8K devices may be attached to the I²C bus and selected individually.
10. SAW FILTERS
Saw filter type : Model:
G1965M
:
PAL-SECAM B/G MONO
K2955M
:
PAL-SECAM B/G-D/K MONO, PAL-SECAM B/G-D/K-I, MONO, PAL-SECAM B/G-D/K-L MONO
K2958M
:
PAL-SECAM B/G-D/K (38) MONO
K2962M
:
PAL-SECAM B/G-L/L MONO
K6259K
:
PAL-SECAM B/G-D/K-I-M/N (EURO) MONO
M1963M
:
PAL M/N MONO, NTSC M MONO, PAL M/N-NTSC M MONO
IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM
n
TDA8840/8842/8844
n
TUNER (UV1316, UV1336)
n
TDA2614
n
TDA8356
n
TDA6107Q
n
MC44604
n
SDA545X
n
ST24C08
TDA8840/8842:
The TDA884X is I^2C-bus controlled single chip TV processor which is intended to be applied in PAL, NTSC, PAL/NTSC and
multi-standard television receivers. These IC s are nearly pin compatible with the TDA837X TV processors but have a higher
degree of integration because the delay line (TDA4665 function) and the SECAM decoder have been integrated. In addition to
these functions some additional features have been added like Continuous Cathode Calibration (2-point black current loop
which results in an accurate biasing of the 3 guns), adjustable luminance delay time, blue stretching and dynamic skin tone control.
Features:
n
Vision IF circuit with PLL demodulator
n
Alignment-free multi-standard FM sound demodulator (4.5 MHz to 6.5 MHz)
n
Audio switch
n
Flexible source selection with CVBS switch and Y(CVBS)/C input so that a comb filter can be applied
n
Integrated chrominance trap circuit
n
Integrated luminance delay line
n
Asymmetrical peaking in the luminance channel with a noise coring function
n
Black stretching of non-standard CVBS or luminance signals
n
Integrated chroma band-pass filter with switchable center frequency
n
Blue stretch circuit which offsets colours near white towards blue
n
RGB control circuit with Continuous Cathode Calibration and white point adjustment
n
Linear RGB inputs and fast blanking
n
Possibility to insert a blue black option when no video signal is available
n
Horizontal synchronisation with two control loops and alignment-free horizontal oscillator
n
Vertical count-down circuit
n
Vertical driver optimised for DC-coupled vertical output stages
n
I^2C-bus control of various functions
n
Low dissipation (850 mW)
Functional Differences between 8840 and 8842
Summary of Contents for EU-34TB
Page 1: ...SERVICE MANUAL 34 cm CTV Effective MAY 2000 EU34TBSERV ...
Page 19: ...18 GENERAL BLOCK DIAGRAM OF CHASSIS AK26 ...
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