3
AK - 44
CHASSIS
TABLE OF CONTENTS
SAFETY PRECAUTIONS
............................................................................................................................................... 5
TV set switched off ............................................................................................................................................... .....5
Measurements ....................................................................................................................................................... 5
PERI-TV SOCKET ........................................................................................................................................................... 5
SCART 1........................................................................................................................................................................... 5
1. INTRODUCTION
......................................................................................................................................................... 6
CIRCUIT DESCRIPTIONS
............................................................................................................................................. 6
2. SMALL SIGNAL PART WITH STV2248
..................................................................................................................... 6
2.1 Vision IF amplifier ........................................................................................................................................... 6
2.2 QSS Sound circuit (QSS versions) ................................................................................................................. 6
2.3 AM Demodulator ........................................................................................................................................... 6
2.4 FM demodulator and audio amplifier (mono versions) .................................................................................. 6
2.5 Video switch ................................................................................................................................................... 6
2.6 Synchronisation circuit .........................................................................................................................................6
2.7 Chroma and luminance processing ................................................................................................................ 7
2.8 RGB output circuit .......................................................................................................................................... 7
2.9 µ-Controller .................................................................................................................................................... 8
2.9.1 Controls .............................................................................................................................................. 8
2.9 .2 Teletext ............................................................................................................................................. 8
2.10 Video Path ..................................................................................................................................................... 9
2.11 Sound Path .................................................................................................................................................. 9
2.12 AV Input Signal Path ..................................................................................................................................... 9
2.12.1 Video and Sound ............................................................................................................................ 9
2.12.2 RGB ................................................................................................................................................ 9
3. TUNER
....................................................................................................................................................................... 9
4. DIGITAL TV SOUND PROCESSOR MSP34X0
........................................................................................................ 10
5. SOUND OUTPUT STAGE TDA7266L/TDA7266
...................................................................................................... 10
6. VERTICAL OUTPUT STAGE WITH TDA8174A
....................................................................................................... 10
7. VIDEO OUTPUT AMPLIFIER TDA6107
................................................................................................................... 11
8. POWER SUPPLY (SMPS)
.......................................................................................................................................... 11
8.1 Start Up ......................................................................................................................................................... 11
8.2 Voltage Regulation .......................................................................................................................................... 11
8.3 Voltage Protection .......................................................................................................................................... 11
8.4 Current Regulation .......................................................................................................................................... 11
8.5 Standby operation .......................................................................................................................................... 12
8.6 Mode transition ............................................................................................................................................. 12
8.7 SMPS Switch Off .......................................................................................................................................... 12
9. LINE CIRCUIT
............................................................................................................................................................ 12
9.1 B.C.L. Circuit (Beam Current Limiter) ........................................................................................................... 13
10. SERIAL ACCESS CMOS 8K EEPROM 24C08
...................................................................................................... 13
11. SAW FILTERS
.......................................................................................................................................................... 13
12. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM
..................................................................................... 13
ST92195 ................................................................................................................................................................ 14
STV224X ............................................................................................................................................................... 15
UV1315, UV1316, UV1336 .................................................................................................................................. 15
TDA7266/TDA7266L .......................................................................................................................................... 17
TDA8174 ..................................................................................................................................................................18
TDA6107 ................................................................................................................................................................ 18
MC44608 .................................................................................................................................................................19
MSP34X0G ..............................................................................................................................................................19
24C08 .................................................................................................................................................................... 20
Содержание 21LF-90N
Страница 6: ...6 21LF 90N CHASSIS LAYOUT Mother Unit CRT Unit Headphone Unit ...
Страница 44: ...32 AK 44 CHASSIS 18 2 Schematic Diagram of Video Circuit 1 I H G F E D C B A 2 3 4 5 6 7 Page 33 ...
Страница 45: ...33 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A Page 32 18 2 Schematic Diagram of Video Circuit ...
Страница 46: ...34 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 Page 35 18 3 Schematic Diagram of SMPS Circuit ...
Страница 47: ...35 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A Page 34 18 3 Schematic Diagram of SMPS Circuit ...
Страница 48: ...36 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 18 4 Schematic Diagram of Audio Circuit ...
Страница 49: ...37 AK 44 CHASSIS 8 9 10 11 12 13 14 I H G F E D C B A 18 5 Schematic Diagram of Deflection Circuit ...
Страница 50: ...38 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 Page 39 18 6 Schematic Diagram of Scart AV Front Circuits ...
Страница 52: ...40 AK 44 CHASSIS 1 I H G F E D C B A 2 3 4 5 6 7 18 7 Schematic Diagram of CRT Socket Circuit ...
Страница 55: ...43 AK 44 CHASSIS Notes ...