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CONTENTS
CIRCUIT DESCRIPTION OF THE 11AK20S CHASSIS ....................................... 2
1. GENERAL INFORMATION : ................................................................................................................... 2
2. IF STAGE : ............................................................................................................................................. 2
2.1 Video and Sound IF System & Switch IC STV8223: ............................................................................. 3
2.2 Multi-Standard Video IF, Sound IF and Switch IC (STV 8224) ............................................................... 3
3. SIGNAL PROCESSING PART : .............................................................................................................. 4
3.1 Bus-controlled Multi-Standard TV Processor IC, STV 2118 : ................................................................ 4
3.1.1 Deflection Circuit: .............................................................................................................................. 4
3.1.2 Filters : .............................................................................................................................................. 5
3.1.3 Video Circuit : .................................................................................................................................... 5
3.1.4 Chroma Circuit : ................................................................................................................................. 5
3.1.5 Other Functions : ............................................................................................................................... 5
3.2 Base Band Chroma Delay Line IC STV 2180 : ..................................................................................... 6
4. HORIZONTAL OUTPUT AND EHT STAGE : .......................................................................................... 6
5. VERTICAL OUTPUT STAGE (TDA 1771) .............................................................................................. 6
6. SOUND OUTPUT STAGE (TDA2822M) : ............................................................................................... 6
7. POWER SUPPLY (SMPS) : .................................................................................................................... 6
8. uC (MICROCONTROLLER) : ................................................................................................................. 7
9. CRT BASE-BOARD : .............................................................................................................................. 7
MANUAL ADJUSTMENT PROCEDURES OF THE 11AK20S CHASSIS ............ 8
How to enter and exit the SERVICE Menu: ................................................................................................. 8
How to use the ADJUST Menu: .................................................................................................................. 8
AGC Adjustment: ........................................................................................................................................ 8
Vertical Amplitude Adjustments: .................................................................................................................. 8
Vertical Shift and Horizontal Shift Adjustments: .......................................................................................... 8
Vertical Linearity Adjustment: ...................................................................................................................... 8
White Point Adjustment: ............................................................................................................................. 8
Black point Adjustment: .............................................................................................................................. 8
How to use the OPTION BYTEs: ................................................................................................................ 9
AFC Adjustment: ...................................................................................................................................... 10
GENERAL BLOCK DIAGRAM OF THE 11AK20S CHASSIS............................ 11
1
CIRCUIT DESCRIPTION OF THE 11AK20S CHASSIS
1. GENERAL INFORMATION :
This document provides detailed information about the fully I2C controlled Television Chassis named 11AK20S.
11AK20S is based on the bus controlled circuits in which all the filters, traps and delay lines have been
integrated. Therefore the numbers of external components are reduced and the user, service and factory
adjustments are made through I2C BUS control.
This chassis has been designed mainly for the 90