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SERVICE MANUAL
34 cm CTV
Effective: MAY 2000 EU34TBSERV
CONTENTS
Contents ................................................................................................................................................................................... 1
Safety Precautions ................................................................................................................................................................... 2
TV Set switched off .................................................................................................................................................................. 2
Measurements .......................................................................................................................................................................... 2
PERI-TV SOCKET ................................................................................................................................................................... 2
SCART 1 ................................................................................................................................................................................... 2
INTRODUCTION ......................................................................................................................................................................... 2
SMALL SIGNAL PART WITH TDA884X .................................................................................................................................. 2-3
TUNER ...................................................................................................................................................................................... 4
SOUND OUTPUT STAGE TDA2614 .......................................................................................................................................... 4
VERTICAL OUTPUT STAGE WITH TDATDA8356 ..................................................................................................................... 4
VIDEO OUTPUT AMPLIFIER TDA6107Q .................................................................................................................................... 4
POWER SUPPLY (SMPS) .......................................................................................................................................................... 4
MICROCONTROLLER SDA545X ............................................................................................................................................... 5
SERIAL ACCESS CMOS 8K (1024*8) EEPROM ST24C08 ........................................................................................................ 5
SAW FILTERS ........................................................................................................................................................................... 5
IC DESCRIPTIONS AND INTERNAL BLOCK DIAGRAM ............................................................................................................. 5
TDA8840/TDA8842 ............................................................................................................................................................ 5-6
UV1316/UV1336 ................................................................................................................................................................ 7
TDA2614 ............................................................................................................................................................................ 7-8
TDA8356 ............................................................................................................................................................................ 8
TDA6107Q .......................................................................................................................................................................... 8
MC44604 ............................................................................................................................................................................ 9
SDA545X ............................................................................................................................................................................ 9-11
ST24C08 ............................................................................................................................................................................. 11
G1965M .............................................................................................................................................................................. 11
AK26 CHASSIS MANUAL ADJUSTMENT PROCEDURE .......................................................................................................... 11
For Adjust Settings ............................................................................................................................................................. 11
WHITE BALANCE ADJUSTMENT ........................................................................................................................................ 11
AGC ADJUSTMENT ............................................................................................................................................................ 11
IF-PLL NEGATIVE ADJUSTMENT ........................................................................................................................................ 12
4 : 3 HORIZONTAL SHIFT ADJUSTMENT ....................................................................................................................... 12
4 : 3 VERTICAL SLOPE ADJUSTMENT ........................................................................................................................... 12
4 : 3 VERTICAL AMPLITUDE ADJUSTMENT ................................................................................................................... 12
4 : 3 S-CORRECTION ADJUSTMENT .............................................................................................................................. 12
4 : 3 VERTICAL SHIFT ADJUSTMENT ............................................................................................................................ 12
For Option Settings ................................................................................................................................................................... 12
OPTION 00 .......................................................................................................................................................................... 12-13
OPTION 01 .......................................................................................................................................................................... 13-14
OPTION 02 .......................................................................................................................................................................... 13
OPTION 03 .......................................................................................................................................................................... 14
OPTION 04 .......................................................................................................................................................................... 14
OPTION 05 .......................................................................................................................................................................... 14
OPTION 06 .......................................................................................................................................................................... 14
OPTION 07 .......................................................................................................................................................................... 15
GENERAL BLOCK DIAGRAM OF CHASSIS AK26 ................................................................................................................... 16
ELECTRONIC COMPONENT PART LIST .................................................................................................................................... 17-18
1
DO NOT CHANGE ANY MODULE UNLESS THE SET IS SWITCH OFF
The mains supply side of the switch mode power supply transformer is live.
Use an isolating transformer.
The receivers fulfill completely the safety requirements.
Safety precautions:
Servicing of this TV should only be carried out by a qualified person.
- Components marked with the warning symbol on the circuit diagram are critical for safety and must only be replaced with an identical
component.
- Power resistor and fusable resistors must be mounted in an identical manner to the original component.
- When servicing this TV, check that the EHT does not exceed 26kV.
TV Set switched off:
Make short-circuit between HV-CRT clip and CRT ground layer.
Short C804 (150mF) before changing IC802 or other components in primary side of SMPS.
Measurements:
Voltage readings and oscilloscope traces are measured under following conditions.
Antenna signal 60dB from colourbar generator. (100% white, 75% colour saturation)
Brightness, contrast, colour set for a normal picture.
Mains supply, 110VAC, 60Hz.
PERI-TV SOCKET
SCART 1 (SC050)
1 Audio right output 0.5Vrms / 1K
2 Audio right input 0.5Vrms / 10K
3 Audio left output 0.5Vrms / 1K
4 Ground AF
5 Ground Blue
6 Audio left input 0.5Vrms / 10K
7 Blue input 0.7Vpp / 75ohm
8 AV switching input 0-12VDC /10K
9 Ground Green
10 -
11 Green input 0.7Vpp / 75ohm
12 -
13 Ground Red
14 Ground Blanking
15 Red input 0.7Vpp / 75ohm
16 Blanking input 0-0.4VDC, 1-3VDC / 75ohm
17 Ground CVS output
18 Ground CVS input
19 CVS output 1Vpp / 75ohm
20 CVS input 1Vpp / 75ohm
21 Ground
1. INTRODUCTION
11AK26 is a 90