Grundig W70-1021 Schematic

GRUNDIG

W70-1021

Product code: 564383

SERVICE MANUAL

June, 10th 2002

CONTENTS: (E12)

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 9-17

5. IC PIN DETAILS : PAGE 18-22

6. PCB LAYOUTS : PAGE 23

7. EXPLODED VIEW, MANUF. PARTS : PAGE 24,28

8. PART LIST : PAGE 25-27

9. CIRCUIT DIAGRAMS : PAGE 29-31

1

PRODUCT SPECIFICATION & FEATURES

TVTEXT Version 7p (SDA 5553-A009/EV E945)

1. SCREEN SIZE:

2. AVAILABLE

STANDARDS:

3. TUNER:

4. FEATURES:

5. SOUND:

6. TELETEXT:

7. CONNECTIONS:

8. VIDEO:

9. CONSUMPTION:

28”
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: 2x15W (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)

2

BLOCK DIAGRAM: MODULES ARRANGEMENT ON CHASSIS

L

R

E12 CHASSIS

MODULES & CONNECTION

21.5.2002

3

BLOCK DIAGRAM – MODULES & CONNECTIONS

2

AUDIO

SREREO

AUDIO

VK-E9T

TDA6107

IC201

R

L

K101B

2

K104

OUT

TDA7057A

IC102

PROC.

MSP34XXG

IC503

K102A

RGB

V+V-GUARD

7

RGB

K704

4

2

K301

VERT.

OUT

TDA8356-90°

TDA8351-110°

CRT SOCKET

K703B K704B

K752

H. DRIVE

K703A K704A

EW DRIVE

H. FLY

LZ-E9

IC301

Z_COR

2

E12 CHASSIS

BLOCK DIAGRAM

MODULES & CONNECTIONS

6.6.2002

K701

K702A

HOR.

OUT

BU508A

T701

42V

15V

EHT COMP

BEAMCURR

R,G,B,BL

SC1

200V

L,R

K105

SCART 1

IF

U4468B

IC501

R,G,B,BL

R,G,B,BL IN

R G B

SWITCH

74HCT4053

IC801

CVBS_SC1

CVBS_INT

SIGNAL &

SAW

TUNER

E12

DEFL. PROC.

filter

F108

TUN101

CVB

S_EXT

VIDEO

SWITCH

TEA2014

TDA884X

IC101

K6

SDA5553

CONTROL

& TEXT

IC1

PROC.

K901A

IC104

A

T

8,5V

33V

12V

15V

155V

POWER

SUPPLY

K106

SCART 2

CVB

S

_

SC2

A1

A2

2,5V

2,5V

5V

8V

TDA4605-2

2,5V

3,3V

BUZ90A

IC601

T602

K601

5

230V AC

4

BLOCK DIAGRAM – CONTROL SIGNALS

SIGNAL &
DEFL. PR.
IC101

EEPROM
IC1

EEPROM
IC2

pin54
pin26

SCL_pin7

SDA_pin8

SDA_pin5

SCL_pin6

SDA_pin5

SCL_pin6

AGC

IIC1

2
C

I

I

pin5

TUNER
TUN101

SCL_pin4

SDA_pin5

STEREO PROC.
IC503

SCL_pin7

SDA_pin8
pin20

VIDEO SW.
IC104

pin5

RGB SW.

SFTLA_E9
TPA_CG

A
1
0
9

K

B
Y
E
K

pin
15

A
1

)
1

(

0
9

K

D
E

L

pin
46

)
2

(

CONTR. &
TEXT PROC .
IC1

pin
16

1

I
R
E
P

SC1

8

K901A

5
C
R

pin
24

(3)

pin
17

SC2

2

I
R
E
P

5
n

i
p
_
1

A
D
S

8

1
C
S

_
L

B

4

6

n

n

i

i

p

p
_
1
L

C
S

DECODER

T107

8
n

i
p
_
2
L

C
S

pin
3

IC801

pin9,10,11

ON/OFF SW.
T9, T601, T603

V
T

/
V

RESET

A

ON/OFF

3

7

2

2

n

n

i

i

p

p

1

1

2

n

n

i

i

p

p

AUDIO
OUT
IC102

pin

VOL pin

51

1,7

5

BLOCK DIAGRAM - SUPPLY VOLTAGES

6

COMPONENT LOCATION AND MEASURING POINTS FOR

V

SUPPLY VOLTAGES ON MAIN CHASSIS – COMPONENT SIDE

155V adjust 200V155V

A

8,5V

A1

2,5V

2,5V2,5V

A2

3,3V

15V

T

15V

42V

12V

8V

5

33V

7

COMPONENT LOCATIONS ON SEPARATE MODULES OF CHASSIS E12 –
COMPONENT SIDE

VK-E9TM

TPA-CG

8

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 ±±±±0,5V

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

adjustment should be repeated.

2. 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).

9

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.

5. 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).

10