Grundig W70-2030 Schematic

GRUNDIG

W70-2030

Product code: 328406

SERVICE MANUAL

July, 2001

CONTENTS: (E9A)

1. PRODUCT SPECIFICATIONS & FEATURES : PAGE 2

2. BLOCK DIAGRAM : PAGE 3,4,5,6

3. COMPONENT LOCATION : PAGE 7,8

4. SET-UP PROCEDURE & ALIGNMENT INSTRUCTIONS : PAGE 9-18

5. IC PIN DETAILS : PAGE 19-23

6. PCB LAYOUTS : PAGE 24

7. EXPLODED VIEW, MANUF. PARTS : PAGE 25,30

8. PART LIST : PAGE 26-29

9. CIRCUIT DIAGRAMS : PAGE 31-34

PRODUCT SPECIFICATION & FEATURES

TVTEXT Version 7p (SDA 555 XFL)

1. SCREEN SIZE:

2. AVAILABLE

STANDARDS:

3. TUNER:

4. FEATURES:

5. SOUND:

6. TELETEXT:

7. CONNECTIONS:

8. VIDEO:

9. CONSUMPTION:

28” 16:9 PAL I,

HYPERBAND: VHF 2-12, UHF 21-69, S1-S41 Frequency synt. (62,5KHz search steps), MENU oriented OSD (On Screen Disp.) Multilanguage MENU OSD, 100 programs, Full function remote control, Automatic switch off at the end of the progr. Off timer 0 - 120 min., Organise Program Informatio n System (OPIS) with the following functions:

• Autostore with simple ATS: Autostore, Name, Order,

• Insert

• Delete

• Rename,

MONO/STEREO/DUAL sound decoder, Virtual Dolby sound, NICAM Digital Stereo Sound Processor, Muting, 2 loudspeakers, Audio music power: 2x6W (STEREO), 7 - page TTX with FLOF and P26, Westeuropean and easteuropean language support. SCART I AV connector (21 - pin) video, RGB and SVHS, SCART II AV connector (21 - pin) video Antenna connection 75 ohms unbalanced, Blue stretch, Automatic Colour limiting, Colour Temperature adjustment,

≈95W; <9W stand by; POWER REQUIREMENTS: Voltage/frequency: 230V/50Hz , rating (180V - 250V)

BLOCK DIAGRAM: MODULES ARRANGEMENT ON CHASSIS

E9A CHASSIS

MODULES & CONNECTION

14.6.2001

BLOCK DIAGRAM – MODULES & CONNECTION

VK-E9T

TDA6107

TDA6108

K104B

R G B

E9A CHASSIS

BLOCK DIAGRAM

MODULES & CONNECTION

13.7.2001

K104A

AUDIO OUT

K507

K506A

K508A

K510A

ST1-E9A

MSP3411G

U4468B

TDA884X

TDA7057A

K001C

K500B, K501B, K502B, K503B, K504B

DEFL.

SIGNAL AND

PROCESSOR

K102A K101B

V+V-GUARD

VERT. OUT

K001A

K500A, K501A, K502A, K503A, K504A

CVBS int

CVBS_ext

TDA8351

L,R

S-RGB

VIDEO

K751

K703A K704A

K703B K704B

LZ-E9

K752

K800A, K804A

K800B, K804B

74HCT4053

SWITCH

TEA2014

HOR. OUT

H.DRIVE

EW DRIVE

H. FLY

EHT COMP

CVBS_SC1

BU508A

SCART 1

K105A

SCART 2

K106A

CVBS_SC2

filter

SAW

TUNER1

CTF5510

E9A

K901B

TP-CG

PR+ PR-

IC02

K902A

IC01

SDA555 XFL

K901A

K901B

24V8V33V

150V

12V

POWER SUPPLY

5VA

15VT

BUZ90A

TDA4605-2

230V AC

BLOCK DIAGRAM – CONTROL SIGNALS

BLOCK DIAGRAM - SUPPLY VOLTAGES

COMPONENT LOCATION AND MEASURING POINTS FOR

SUPPLY VOLTAGES ON MAIN CHASSIS – COMPONENT SIDE

24V152V adjust 200V152V 33V

8,5VA2,5VA12,5V2,5VA23,3V12V5V

42V15V15VT

12V

COMPONENT LOCATIONS ON SEPARATE MODULES OF CHASSIS E9 – COMPONENT SIDE

VK-E9T

TP-CG

S-RGB

LZ-E9

ST1-E9 (module stereo)

SETUP PROCEDURE & ALIGNMENT INSTRUCTIONS

All necessary adjustments and settings are performed during manufacture of TV set and assure its correct operation when connected to the mains voltage and antenna or external video or audio signal. When TV set requires service intervention all settings should be checked and corrected, if necessary.

DEMAGNETISING OF PICTURE TUBE

Correctness o f picture tube d emagnetising i s usually automati cally checked . Magnetisatio n of picture tube is presented as one or more colour "clouds", consequently colour reproduction of the picture is not correct. Each time the TV set is switched on with mains switch, demagnetising system is activated. For correct demagnetising procedure disconnect the TV set with mains switch and leave it disconnected for about 15 minutes. Afterwards when you switch on the TV, demagnetising procedure is performed. In case distortion of colour reproduction still persists, special demagnetising coil should be used.

ADJUSTMENT ADJUSTMENT

CONDITION

1. SUPPLY VOLTAGE FOR HORIZONTAL OUTPT STAGE

»B+«

SWITCHING TO SERV ICE MODE

All other service settings of TV set are made in so called service mode of TV set operation. To enter this mode of operation press the keys in the following sequence: "TV", "I", and "STOP" in the period of 5 seconds from switching on the TV set to normal mode of operation. When the TV set is switched over to service mode the following status line with service parameter and parameter value appears on the screen:

SERVICE PARAM: XX VALUE: xx

The parameter to be set is selected with keys (P+/P-), and selected parameter is set with keys (volume+ /volume-). Each time you press the key for parameter selection ( ) the value of preselected parameter is stored. Therefore when the last setting is performed you must press one of the two keys once again. Values of individual parameters are expressed in hexadecimal form due to limited capacity of the memory. Values of individual parameters are variable from 0 to 3F, with the exception of some parameters (see the table at the end of describing service mod e) where values are changed fro m 0 to 7F and O1, O2, O3, O4, O5 which have value range between 0 an d FF. When setting is finished it should obligatory be concluded with "STOP" key. After a few seconds the status line disappears and service adjustment is accomplished.

• Connect the TV set to

supply voltage 175…250VAC.

• Switch it on and set it by

means of remote controller to AV mode of operation.

• Connect DC voltmeter to

D-602 cathode.

With P-601 potentiometer set supply voltage for horizontal output stage to:

ADJUSTMENT ACTIVITY

AND RESULT OF SETTINGS

• 152V ±±±±0,2V

NOTE: In case service adjustment is not ended in above specified mode (e.g. power supply breakdown), the

adjustment should be repeated.

VERTICAL

PICTURE POSITION

• To antenna connector of

TV set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: VH VALUE: xx

• With remote

controller set vertical position of the picture: beginning of dark part of the picture should be exactly in the centre of the screen (two bright points on left and right side of the screen).

ADJUSTMENT ADJUSTMENT

CONDITION

3. VERTICAL

AMPLITUDE ON TOP PART OF SCREEN

4. VERTICAL AMPLITUDE ON BOTTOM PART OF SCREEN

• To antenna connector of TV

set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: VA VALUE: xx

• To antenna connector of

TV set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: VS VALUE: xx

ADJUSTMENT ACTIVITY

AND RESULT OF SETTINGS

• With remote

controller set vertical amplitude of picture on top, visible part of the screen. The beginning of test picture should be at the beginning of top part of the screen.

• With remote

controller set vertical amplitude of picture on bottom part of the screen. The lower part of test picture should be at the edge of bottom part of the screen. During this setting the picture on top part of the screen should not change.

CORRECTION OF

"S" VERTICAL PICTURE DISTORTION

6. HORIZONTAL PICTURE POSITION

• To antenna connector of TV

set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: SC VALUE: xx

• To antenna connector of

TV set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following setting

on the screen:

SERVICE PARAM: HS VALUE: xx

• With remote

controller correct the picture. The distances between the two horizontal lines of test picture in the centre of the screen should be equal to the distances on top and bottom part of the screen. If after this setting vertical amplitude of picture changes, see pos. 5 and 6.

• With remote

controller set test picture to the centre of the screen (if necessary first widen the picture, see pos.

7).

ADJUSTMENT ADJUSTMENT

CONDITION

7. HORIZONTAL AMPLITUDE

OF PICTURE

• To antenna connector of TV

set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: EW VALUE: xx

ADJUSTMENT ACTIVITY

AND RESULT OF SETTINGS

• With remote

controller set picture width. Edges of test picture should be just hidden behind the edges of the screen.

8. CORRECTION OF PICTURE HORIZONTAL PINCUSHION DISTORTION

9. CORRECTION OF PICTURE HORIZONTAL PINCUSHION DISTORTION IN CORNERS OF THE SCREEN

10. CORRECTION OF

PICTURE TRAPEZIUM DISTORTION

• To antenna connector of

TV set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: PW VALUE: xx

• To antenna connector of TV

set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

SERVICE PARAM: CP VALUE: xx

• To antenna connector of

TV set, which is switched on and operates in service mode, connect VF signal source with PHILIPS test picture.

• Select the following service

setting on the screen:

• With remote

controller correct the picture. On left and right side of test picture straight lines should appear (especially in the centre of the picture).

• With remote

controller correct the picture. On left and right part of test picture straight lines should appear also in corners of the screen.

• With remote

controller correct the picture. On left and right part of test picture perfectly straight and vertical lines should appear.

SERVICE PARAM: TC VALUE: xx

REMARK: If after correcting pincushion and trapezoidal distortion, changes the horizontal amplitude of picture, is necessary to

correct also horizontal amplitude of picture according to explanation in point 7.

+ 23 hidden pages