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CP-850FX Service Manual
Europe R&D
3
5.4.2.4
Black Level Expander/Compressor (BLEC) ..............................................................51
5.4.2.5
Luma Sharpness Enhancer (LSE) ............................................................................51
5.4.2.6
Dynamic Peaking......................................................................................................51
5.4.2.7
Luma Transient Improvement (LTI) ..........................................................................51
5.4.2.8
Mixing of Dynamic Peaking and LTI .........................................................................51
5.4.2.9
Chroma Transient Improvement ...............................................................................51
5.4.2.10
Analog Back End ....................................................................................................53
5.4.2.11
Analog RGB Insertion .............................................................................................53
5.4.2.12
CRT Measurement and Control ..............................................................................53
5.4.2.13
Synchronization and Deflection ..............................................................................54
5.4.2.14
EHT Compensation ................................................................................................54
5.5
MICRONTROLLER ...........................................................................................................54
5.5.1
MICROCONTROLLER FEATURES
............................................................................54
5.5.2
ACQUISITION FEATURES
.........................................................................................54
5.5.3
PORTS
........................................................................................................................55
5.5.4
μ
-CONTROLLER I/O PIN CONFIGURATION AND FUNCTION TABLE
.....................55
5.5.5
TUNING
.......................................................................................................................55
5.5.6
AUTOMATIC PICTURE FORMAT SWITCHING
.........................................................56
5.5.6.1 WSS Data .................................................................................................................56
5.5.6.2
SCART Pin 8 Data (Slow Switching) ........................................................................57
5.5.6.3
Picture Format Description .......................................................................................57
5.3.1.8.1
16:9 CRT ...............................................................................................................57
5.3.1.8.2
4:3 CRT .................................................................................................................58
5.5.7
EXTERNAL SOURCE CONTROL LOGIC
...................................................................59
5.5.8
OVER CURRENT PROTECTION
................................................................................60
5.6
TELETEXT DISPLAY........................................................................................................60
5.7
SOUND PROCESSING ....................................................................................................61
5.7.1
ANALOGUE SOUND IF - INPUT SECTION
...............................................................61
5.7.2
QUADRATURE MIXERS
.............................................................................................61
5.7.3
PHASE AND AM DISCRIMINATION
...........................................................................61
5.7.4
NICAM DECODER
......................................................................................................62
5.7.5
DSP SECTION
............................................................................................................62
5.7.6
SOUND MODE SWITCHING
.......................................................................................62
5.8
SOUND AMPLIFICATION.................................................................................................62
5.8.1
POWER AMPLIFIER
...................................................................................................62
5.8.2
MODE SELECTION
.....................................................................................................63
5.9
VERTICAL DEFLECTION.................................................................................................63
5.9.1
FLYBACK VOLTAGE
..................................................................................................63
5.9.2
PROTECTION
.............................................................................................................63
5.9.3
GUARD CIRCUIT
........................................................................................................63
5.9.4
DAMPING RESISTOR
.................................................................................................63
5.9.5
EAST-WEST AMPLIFIER
............................................................................................63
5.10
POWER SUPPLY (STR-W6754) - FUNCTIONS OF EACH TERMINAL ..........................64
5.10.1
Vcc Terminal (Pin 4)
...................................................................................................64
5.10.1.1
Start-up Circuit........................................................................................................64
5.10.1.2
Auxiliary/Drive Winding ...........................................................................................65
5.10.1.3
Overvoltage Protection Circuit ................................................................................66
5.10.1.4
Latch Circuit............................................................................................................67
5.10.2
SS/OLP Terminal (Pin 5)
..........................................................................................67
5.10.2.1
Soft-Start Operation at Start-up of Power Supply ...................................................67
5.10.2.2
Overload Protection ................................................................................................68
5. 10. 2. 3
Operation at Power Supply OFF ...........................................................................69
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