Toshiba 24W33B, Service Manual

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1
CONTENTS
SAFETY PRECAUTIONS: ................................................................................................................................... 2
TV set switched off .......................................................................................................................................... 2
Measurements ................................................................................................................................................ 2
PERI-TV SOCKET ............................................................................................................................................... 2
SCART 1 2
SCART 2 2
1. INTRODUCTION ............................................................................................................................................. 2
2.SMALL SIGNAL PART WITH STV2248 ........................................................................................................... 3
2.1 Vision IF amplifier................................................................................................................................... 3
2.2 QSS Sound circuit (QSS versions) ......................................................................................................... 3
2.3 FM demodulator and audio amplifier (mono versions) ......................................................................... 3
2.4 Video switch ............................................................................................................................................ 3
2.5 Synchronisation circuit ............................................................................................................................ 3
2.6 Chroma and luminance processing ...................................................................................................... 4
2.7 RGB output circuit ................................................................................................................................... 4
2.8 µ-Controller ............................................................................................................................................. 4
3. TUNER ............................................................................................................................................................ 5
4- MULTISTANDARD SOUND PROCESSOR .................................................................................................... 5
5. SOUND OUTPUT STAGE TDA7269A ............................................................................................................. 5
6. VERTICAL OUTPUT STAGE WITH STV9306 ............................................................................................. 5-6
7. VIDEO OUTPUT AMPLIFIER STV5112 ........................................................................................................... 6
8. POWER SUPPLY (SMPS) ............................................................................................................................... 6
9. POWER FACTOR CORRECTION .................................................................................................................. 6
10. SERIAL ACCESS CMOS 8K EEPROM 24C08 ............................................................................................. 6
11. CLASS AB STEREO HEADPHONE DRIVER TDA1308 ................................................................................ 6
12. CLASS AB MONO SUBWOOFER DRIVER TDA7261 ................................................................................... 6
13. SAW FILTERS ............................................................................................................................................... 6
14. IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM .............................................................................. 6
• ST92195 ....................................................................................................................................................... 7
• STV224X ................................................................................................................................................... 7-8
• UV1315, UV1316, UV1336 ...................................................................................................................... 8-9
• TDA7269A .................................................................................................................................................. 10
• STV9306 ..................................................................................................................................................... 10
• STV5112 ..................................................................................................................................................... 11
• MC44608 .................................................................................................................................................... 11
• MSP 34XXG ................................................................................................................................................ 12
• 24C08 ................................................................................................................................................... 12-13
• TDA1308 .................................................................................................................................................... 13
• TDA7261 .................................................................................................................................................... 13
• SAW FILTERS ............................................................................................................................................. 14
15.CIRCUIT DESCCIRIPTION ................................................................................................................... 15-19
16.AK37 CHASSIS MANUAL ADJUSTMENT PROCEDURE ...................................................................... 20-22
17.OPTION SETTING ................................................................................................................................. 23-25
18.TUNER SETTING ........................................................................................................................................ 26
19.GENERAL BLOCK DIAGRAM of CHASSIS 11AK37 .................................................................................... 27
20.AK37 / TITANIUM - Languages Groups ....................................................................................................... 28
21.AK37 PROJECT BLOCK DIAGRAMS .......................................................................................................... 29
21.1 BLOCK DIAGRAM ................................................................................................................................. 30
21.2 SMPS BLOCK DIAGRAM ....................................................................................................................... 31
21.3 MICRO CONTROLLER BLOCK DIAGRAM ........................................................................................... 32
21.4 VIDEO BLOCK DIAGRAM ...................................................................................................................... 33
21.5 STEREO BLOCK DIAGRAM .................................................................................................................. 34
21.6 SCART BLOCK DIAGRAM ..................................................................................................................... 35
21.7 DEFLECTIOAN BLOCK DIAGRAM ........................................................................................................ 36
21.8 BASE BOADR BLOCK DIAGRAM .......................................................................................................... 37
22. CIRCUIT DIAGRAMS .................................................................................................................................. 38
22.1 SMPS CIRCUIT DIAGRAM .................................................................................................................... 38
22.2 MICRO CONTROLLER CIRCUIT DIAGRAM ......................................................................................... 39
22.3 VIDEO CIRCUIT DIAGRAM ................................................................................................................... 40
22.4 STEREO CIRCUIT DIAGRAM ............................................................................................................... 41
22.5 SCART CIRCUIT DIAGRAM .................................................................................................................. 42
22.6 BASE BOARD CIRCUIT DIAGRAM ....................................................................................................... 43
22.7 CRT BOARD CIRCUIT DIAGRAM ......................................................................................................... 44