DAEWOO WP-895, WP-895F, CP-885, CP-885F, CP-485F Service Manual

S/M No. : TWP895BEF0R2

Service Manual

Colour Television

CHASSIS

WP-895

WP-895F CP-885

CP-885F

CP-485F

✔

Caution

: In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr Jun. 2002

Service manual WP-895/895F. CP885/885F. CP485F

Contents

1 - Main features ........................................................................................................................................................ 4

1-1 Specifications .................................................................................................................................................. 4

1-2 Channel table .................................................................................................................................................. 8

1-3 ATSS sorting method ....................................................................................................................................... 11

2 - Safety instruction ................................................................................................................................................. 13

3 - Alignment instructions ........................................................................................................................................ 14

3-1 Microcontroller configuration : Service mode ................................................................................................... 14

3-2 Service mode navigation ................................................................................................................................. 14

3-3 Microcontroller configuration : Option .............................................................................................................. 15

3-4 TV set Alignment ............................................................................................................................................. 16

3-4-1 Local oscillator alignment .................................................................................................................... 16

3-4-2 G2 alignment ....................................................................................................................................... 16

3-4-3 White balance ..................................................................................................................................... 16

3-4-4 Focus .................................................................................................................................................. 16

3-4-5 Vertical geometry ................................................................................................................................ 16

3-4-6 Horizontal picture centring................................................................................................................... 16

3-4-7 East/West correction ........................................................................................................................... 16

3-4-8 AGC .................................................................................................................................................... 18

4 - IC description ....................................................................................................................................................... 19

4-1 VCT383xA TV signal processor - Teletext decoder with embedded 8 bit -

Controller ............................................................................................................................................................ 19

4-1-1 Block diagram off the VCT ................................................................................................................... 19

4-1-2 TV-signal Processor ........................................................................................................................... 19

4-1-2 -Controller .......................................................................................................................................... 20

4-1-4 Teletext Features ................................................................................................................................ 20

4-1-5 Displaty OSD Features...................................................................................................................... 21

4-1-6 Audio Features ................................................................................................................................... 21

4-1-7 General Features ............................................................................................................................... 21

4-1-8 Data Capture ....................................................................................................................................... 21

4-1-9 Data Capture Features ........................................................................................................................ 21

4-1-10 TV processor version and -Controller capacity .............................................................................. 22

4-1-11 IC marking and version ....................................................................................................................... 22

4-1-12 Pinning ................................................................................................................................................ 22

4-2 MSP341x Multistandard Sound Processor ................................................................................................... 25

4-2-1 Basic Features of the MSP 341x ......................................................................................................... 25

4-3 TDA4470 - Multistandard Video-IF and Quasi Parallel Sound Processor ......................................................29

4-3-1 Description .......................................................................................................................................... 29

4-3-2 Features .............................................................................................................................................. 29

4-3-3 Pinning ................................................................................................................................................ 29

4-3-4 Block diagram .................................................................................................................................... 30

4-4 TDA894xJ Stereo Audio Amplifier ................................................................................................................. 31

4-4-1 Features ............................................................................................................................................... 31

4-5 TDA835xJ Vertical Amplifier ........................................................................................................................... 33

4-5-1 TDA8357J ........................................................................................................................................... 33

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Service ma nual WP-895/895F. CP885/885F. CP485F

4-5-2 TDA8358J ..............................................................................................................................................34

4-6 TDA6107Q..........................................................................................................................................................35

4-7 24C16 - 16 Kb EEPROM....................................................................................................................................38

4-8 STR - F6653.......................................................................................................................................................39

4-8-1 General description...............................................................................................................................39

4-8-2 Features.................................................................................................................................................39

4-8-3 Block diagram.......................................................................................................................................39

4-8-4 Pin description......................................................................................................................................40

4-8-5 Control part - electrical characteristics.................................................................................................40

4-8-6 MOSFET electrical characteristics.......................................................................................................41

5 - Circuit description..................................................................................................................................................42

5-1 Block diagram....................................................................................................................................................42

5-2 IF section............................................................................................................................................................43

5-2-1 Block diagram.......................................................................................................................................43

5-2-2 Vision IF Amplifier..................................................................................................................................43

5-2-3 Tuner-and VIF-ACG................................................................................................................................44

5-2-4 FPLL, VCO and AFC..............................................................................................................................44

5-2-5 Video Demodulation and Amplifier......................................................................................................45

5-5-6 Sound IF Amplifier and SIF-AGC.......................................................................................................45

5-2-7 Quasi-Parallel-Sound (QPS) Mixer.........................................................................................................45

5-2-8 Standard Switch....................................................................................................................................45

5-2-9 L’ Switch..................................................................................................................................................45

5-2-10Internal Voltage Stabiliser.....................................................................................................................45

5-3 Video - VCT description......................................................................................................................................46

5-3-1 Introduction............................................................................................................................................46

5-3-2 Video Front-end.....................................................................................................................................46

5-3-3 Input Selector........................................................................................................................................46

5-3-4 Clamping ................................................................................................................................................46

5-3-5 Automatic Gain Control........................................................................................................................46

5-3-6 Digitally Controlled Clock Oscillator.....................................................................................................46

5-3-7 Analogue Video Output........................................................................................................................46

5-3-8 Adaptive Comb Filter (VCT3834A only)................................................................................................47

5-3-9 Color Decoder.......................................................................................................................................47

5-3-10Horizontal Scaler...................................................................................................................................47

5-3-11Video Sync Processing........................................................................................................................48

5-3-12Display Processing................................................................................................................................48

5-3-13Chroma Transient Improvement............................................................................................................48

5-3-14Video Back-end.....................................................................................................................................48

5-3-15CRT Measurement and Control...........................................................................................................49

5-3-16Average Beam Current Limiter.............................................................................................................49

5-3-17Analogue RGB Insertion......................................................................................................................49

5-3-18Fast-Blank Monitor................................................................................................................................49

5-3-19Vertical and East/West Deflection.......................................................................................................50

5-3-20EHT Compensation................................................................................................................................50

5-3-21Reset Function......................................................................................................................................50

5-3-22Standby and Power-On........................................................................................................................50

5-4 Micro-controller.........................................................................................................................................................50

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Service manual WP-895/895F. CP885/885F. CP485F

5-4-1Introduction...........................................................................................................................................50

5-4-2CPU......................................................................................................................................................50

5-4-3

-Controller I/O pin configuration and function

5-4-4Tuning..................................................................................................................................................51

5-4-5Automaticrmatswitching andWSS...............................................................................................51

5-4-6EXTERNAL source control logic...........................................................................................................52

5-4-7Over Current Protection........................................................................................................................54

5-5Teletext Display.................................................................................................................................................54

5-6 Sound processing...............................................................................................................................................55

5-6-1Analogue sound IF-input section............................................................................................................55

5-6-2Quadrature Mixers................................................................................................................................55

5-6-3Phase and AM discrimination...........................................................................................................55

5-6-4NICAM decoder....................................................................................................................................56

5-6-5DSP section..........................................................................................................................................56

5-6-6Sound Modeswitching..........................................................................................................................56

5-7 Sound amplification...........................................................................................................................................56

5-7-1Power amplifier.....................................................................................................................................56

5-7-2Mode selection.......................................................................................................................................57

5-8Vertical deflection.............................................................................................................................................57

5-8-1Flybackvoltage.....................................................................................................................................57

5-8-2Protection..............................................................................................................................................57

5-8-3Guard circuit..........................................................................................................................................57

5-8-4Damping resistor...................................................................................................................................57

5-8-5EAST-WEST Amplifier (TDA8358J only)...............................................................................................57

5-9Power supply (STR F6653).. ..............................................................................................................................58

5-9-1STR-F6654 generaraldescription.........................................................................................................58

5-9-2 Power supply primary par t operations...................................................................................................58

5-10TV start-up, TV normal run and stand by mode operations...............................................................................62

5-10-1TV start-up operations..........................................................................................................................62

5-10-2TV normalrun and stand-by mode operations.......................................................................................63

...............................................................................51

6 - Service parts list...................................................................................................................................................68

7 - Exploded View........................................................................................................................................................8

7-1 DWX-28W5 7-2 DWF-28W8 7-3 D T F-29U8 7-4 D T P-28A7 7-5 D T P-28B1 7-6 D T P-28G7 7-7 D T P-28G8

7-8 DWF-28W9

7-9

DTB-21U7

.......................................................................................................................................................

..............................................................................................................

....................................

86 87 88 89

8 - PCB Layout

9 - Circuit Diagram

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Service manual WP 895/895F, CP885/885F, CP485F

1- Main Features

1-1 Specifications

TV standard PAL - SECAM B/G D/K, PAL I/I, SECAM L/L’ Sound system NICAM B/G, I, D/K, L,

FM 2Carrier B/G, D/K

Power consumption 21” Real Falt : 59 W approx.

28” 4:3, FST : 69 W approx. 29" 4:3, REAL FALT : 74 W approx. 28” 16:9, WIDE : 69 W approx.

Sound Output Pow

Speaker 21” : 7W 8 ohm x2

Teletext system 10 pages memory FASTEXT (FLOF or TOP) Aerial input 75 ohm unbalanced Channel coverage Off-air channels, S-cable channels and hyperband Tuning system frequency synthesiser tuning system Visual screen

Channel indication On Screen Display Program Selection 100 programmes Aux. terminal EURO-SCART 1 : Audio / Video In and Out, R/G/B In, Slow and

Remote Control Unit R-46G22

21” : 4.5W x 2 (at 1kHz, 60% mod, 10%THD) 28”, 29" : 7W x 2 (at 1kHz, 60% mod, 10%THD)

28”, 29” : 12W 8 ohm x2

21” : 51 cm 28” : 66 cm 29” : 68 cm

Fast switching. EURO-SCART 2 : Audio / Video In and Out, SVHS In.

Monitor Out(option) AV3 : Audio-Video Jack on front of cabinet.

Headphone jack (3.5 mm) on front of cabinet SVHS3 (option) : Jack on front of cabinet - sound input

common with AV3.

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Service manual WP 895/895F, CP885/885F, CP485F

Specification matrix

CHASSIS NAME WP-895 / CP-485F WP-895F CP885 CP885F

VCT VERSION 3834 3834 3832 3834

SOFTWARE VERSION A A B A

REMOTE CONTROL R46G22 R46G22 R46G22 R46G22

PCB SERIAL NUMBER 4859805093 4859805193 4859805093 4859805193

TUBE 16:09 16:9 REAL FLAT 4:03 4:3 REAL FLAT

SVHS3

"PICTURE IMPROVEMENTS, COMB FILTER, HORIZONTAL SCALER"

TELETEXT SPLIT SCREEN

FORMATS AVAILABLE IN

VIDEO MODE

AV2 MONITOR OUTPUT

MSP VERSION (OPTION) 3410 3411 3410 3411 3410 3415 3410 3411

SOUND EFFECTS

GRAPHIC EQUALIZER

AV3 AUDIO INPUT DEDICATED DEDICATED DEDICATED DEDICATED DEDICATED AV2 COMMON DEDICATED DEDICATED

TELETEXT PAGE MEMORY 10 PAGE 10 PAGE 10 PAGE 10 PAGE

TOP TELETEXT AVAILABLE : SELECTABLE IN FACTORY/SERVICE MODE BY OPTION BITS

FLOF TELETEXT AVAILABLE : SELECTABLE IN FACTORY/SERVICE MODE BY OPTION BITS

TEXT CHARACTER

SUPPORT

OSD LANGUAGES "English, French, German, Italian, Spanish, Dutch, Danish, Finnish, Norwegian, Swedish, Greek, Polish, Hungarian, Czech, Slovakian, Roma-

TUNER OPTIONS "Philips, Alps, Partsnic"

AUTO / 4:3 / 14:9 / ZOOM 14:9 /

ZOOM 16:9 / FULL SCREEN

OFF / SPATIAL OFF / SPATIAL

/ PANORAMA /

VIRTUAL

DOLBY

AUTO / 4:3 / 14:9 / ZOOM 14:9 /

ZOOM 16:9 / FULL SCREEN

OFF / SPATIAL OFF / SPATIAL

/ PANORAMA /

VIRTUAL

DOLBY

"Pan-European Latin, Cyrillic, Greek"

nian, Russian."

AUTO / FULL SCREEN / 14:9 /

16:9

OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL OFF / SPATIAL

AUTO / FULL SCREEN / 14:9 /

16:9 / WATERGLASS

/ PANORAMA /

VIRTUAL

DOLBY

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Service manual WP 895/895F, CP885/885F, CP485F

21 Pin EURO-SCART 1 :

Pin Signal Description Matching value

1 Audio Output Right 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) 2 Audio Input Right 0.5 Vrms, Impedance > 10 3 Audio Output Left 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) 4 Audio Earth 5 Blue Earth

6 Audio Input Left 0.5 Vrms, Impedance > 10 7 Blue Input 0.7 Vpp ±0.1V, Impedance 75 8 Slow Switching TV : 0 to 2V, AV 16/9 : 4.5 to 7V, AV 4/3 : 9.5 to 12V ,

Impedance > 10

9 Green Earth 10 N.C. 11 Green Input 0.7 Vpp 0.1V, Impedance 75 12 N.C. 13 Red Earth 14 Blanking Earth 15 Red Input 0.7 Vpp 0.1V, Impedance 75 16 Fast Switching 0 to 0.4V : Logic “0”, 1 to 3V : Logic “1”, Impedance 75 17 Video Out Earth 18 Video In Earth 19 Video Output 1 Vpp 3dB, Impedance 75 20 Video Input 1 Vpp 3dB, Impedance 75 21 Common Earth

21 Pin EURO-SCART 2 :

Pin Signal Description Matching value

1 Audio Output Right 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) - Not available for cp885 2 Audio Input Right 0.5 Vrms, Impedance > 10 3 Audio Output Left 0.5 Vrms, Impedance < 1 , ( RF 54% Mod ) - Not available for cp885 4 Audio Earth 5 Earth 6 Audio Input Left 0.5 Vrms, Impedance > 10 7 N.C. 8 Slow Switching TV: 0 to 2V, AV 16:9: 4.5V to 7V, AV 4:3: 9.5 to 12V

9 N.C. 10 N.C. 11 N.C. 12 N.C. 13 Earth 14 Earth 15 Chroma Input 3dB for a luminance signal of 1 Vpp 16 N.C. 17 Earth 18 Video In Earth

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Service manual WP 895/895F, CP885/885F, CP485F

19 Video Output 1 Vpp 3dB, Impedance 75 ( Monitor output ) - Not available for cp885 20 Video Input, Y In. 1 Vpp 3dB, Impedance 75 21 Common Earth

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Service manual WP 895/895F, CP885/885F, CP485F

1-2 Channel table

FREQUENCY TABLE

CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT

C01 46.25 - 47.75 49.75 C02 48.25 55.75 (L’) 53.75 59.25 C03 55.25 60.5 (L’) 61.75 77.25 C04 62.25 63.75 (L’) 175.25 85.25 C05 175.25 176.00 183.25 93.25 C06 182.25 184.00 191.25 175.25 C07 189.25 192.00 199.25 183.25 C08 196.25 200.00 207.25 191.25 C09 203.25 208.00 215.25 199.25 C10 210.25 216.00 223.25 207.25 C11 217.25 189.25 (LUX) 231.25 215.25 C12 224.25 69.25 (L’) 239.25 223.25 C13 53.75 76.25 (L’) 247.25 C14 - 83.25 (L’) 49.75 C15 82.25 90.25 57.75 C16 - 97.25 65.75 C17 183.75 - 77.75 C18 192.25 - 85.75 C19 201.25 - - C20 -- - C21 471.25 471.25 471.25 471.25 C22 479.25 479.25 479.25 479.25 C23 487.25 487.25 487.25 487.25 C24 495.25 495.25 495.25 495.25 C25 503.25 503.25 503.25 503.25 C26 511.25 511.25 511.25 511.25 C27 519.25 519.25 519.25 519.25 C28 527.25 527.25 527.25 527.25 C29 535.25 535.25 535.25 535.25 C30 543.25 543.25 543.25 543.25 C31 551.25 551.25 551.25 551.25 C32 559.25 559.25 559.25 559.25 C33 567.25 567.25 567.25 567.25 C34 575.25 575.25 575.25 575.25 C35 583.25 583.25 583.25 583.25 C36 591.25 591.25 591.25 591.25 C37 599.25 599.25 599.25 599.25 C38 607.25 607.25 607.25 607.25 C39 615.25 615.25 615.25 615.25 C40 623.25 623.25 623.25 623.25 C41 631.25 631.25 631.25 631.25

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Service manual WP 895/895F, CP885/885F, CP485F

CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT C42 639.25 639.25 639.25 639.25 C43 647.25 647.25 647.25 647.25 C44 655.25 655.25 655.25 655.25 C45 663.25 663.25 663.25 663.25 C46 671.25 671.25 671.25 671.25 C47 679.25 679.25 679.25 679.25 C48 687.25 687.25 687.25 687.25 C49 695.25 695.25 695.25 695.25 C50 703.25 703.25 703.25 703.25 C51 711.25 711.25 711.25 711.25 C52 719.25 719.25 719.25 719.25 C53 727.25 727.25 727.25 727.25 C54 735.25 735.25 735.25 735.25 C55 743.25 743.25 743.25 743.25 C56 751.25 751.25 751.25 751.25 C57 759.25 759.25 759.25 759.25 C58 767.25 767.25 767.25 767.25 C59 775.25 775.25 775.25 775.25 C60 783.25 783.25 783.25 783.25 C61 791.25 791.25 791.25 791.25 C62 799.25 799.25 799.25 799.25 C63 807.25 807.25 807.25 807.25 C64 815.25 815.25 815.25 815.25 C65 823.25 823.25 823.25 823.25 C66 831.25 831.25 831.25 831.25 C67 839.25 839.25 839.25 839.25 C68 847.25 847.25 847.25 847.25 C69 855.25 855.25 855.25 855.25 C70 863.25 863.25 863.25 863.25 C71 69.25 - - - C72 76.25 - - - C73 83.25 - - - C74 90.25 - - - C75 97.25 - - - C76 59.25 - - - C77 93.25 - - - S01 105.25 104.75 103.25 105.25 S02 112.25 116.75 111.25 112.25 S03 119.25 128.75 119.25 119.25 S04 126.25 140.75 127.25 126.25 S05 133.25 152.75 135.25 133.25 S06 140.25 164.75 143.25 140.25 S07 147.25 176.75 151.25 147.25 S08 154.25 188.75 159.25 154.25 S09 161.25 200.75 167.25 161.25

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Service manual WP 895/895F, CP885/885F, CP485F

CH EUROPE CCIR FRANCE GB(IRELAND) EAST OIRT S10 168.25 212.75 - 168.25 S11 231.25 224.75 - 231.25 S12 238.25 236.75 - 238.25 S13 245.25 248.75 255.25 245.25 S14 252.25 260.75 263.25 252.25 S15 259.25 272.75 271.25 259.25 S16 266.25 284.75 279.25 266.25 S17 273.25 296.75 287.25 273.25 S18 280.25 136.00 295.25 280.25 S19 287.25 160.00 303.25 287.25 S20 294.25 - - 294.25 S21 303.25 303.25 - 303.25 S22 311.25 311.25 311.25 311.25 S23 319.25 319.25 319.25 319.25 S24 327.25 327.25 327.25 327.25 S25 335.25 335.25 335.25 335.25 S26 343.25 343.25 343.25 343.25 S27 351.25 351.25 351.25 351.25 S28 359.25 359.25 359.25 359.25 S29 367.25 367.25 367.25 367.25 S30 375.25 375.25 375.25 375.25 S31 383.25 383.25 383.25 383.25 S32 391.25 391.25 391.25 391.25 S33 399.25 399.25 399.25 399.25 S34 407.25 407.25 407.25 407.25 S35 415.25 415.25 415.25 415.25 S36 423.25 423.25 423.25 423.25 S37 431.25 431.25 431.25 431.25 S38 439.25 439.25 439.25 439.25 S39 447.25 447.25 447.25 447.25 S40 455.25 455.25 455.25 455.25 S41 463.25 463.25 463.25 463.25

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Service manual WP 895/895F, CP885/885F, CP485F

1-3 ATSS sorting method

The TV set sweeps all the TV bands from beginning of VHF to end of UHF. The TV controlling software for each program checks if a VPS CNI code is transmitted ( this system exists for German, Swiss and Austrian transmissions). If no VPS CNI code is found, then the system check if a CNI code is transmitted as part of the teletext transmission ( Packet 8/30 format 1 ). If such a code ( VPS or teletext ) is found and if this code is in the ATSS list, the program is automatically named. If the transmission does not have VPS CNI, and no teletext service is available, then there is no possibility of the program being automatically named. The programs found are then sorted in 4 groups :

Group I : It contains all the programs from the selected country and named by the TV controlling software. Within this group the sorting order is fixed by the ATSS list.

Group II : It contains all the programs with a strong signal strength which are not listed in group I. Group III : It contains all the programs with a weak signal strength which are not listed in group I. Group IV : If two or more programs with the same code are found, only the strongest ( or if they have the same level

the one with the lowest frequency) is listed in group I, II or III. The others are listed in group IV.

Program

number

Group

1 2 Group I

...

n+1

... Group II m

m+1

... Group III

p+1

... Group IV

Skip

Program

number

Group

1 ... Group II m

m+1

... Group III

p+1

... Group IV

q+1

.... not used

Skip

q+1

.... not used

Special case : Country selection = Others

Special case : France Note : If two programs with the same name but a different code are found these two programs are listed in group I, II or III ( e.g. Regional program SW3 in Germany ).

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Service manual WP 895/895F, CP885/885F, CP485F

The sorting order within group II, III, and IV is based on the channel frequency. The Program with the lowest frequency is allocated the first rank in its group, and so forth until the last program of the group which has the highest frequency.

Special case : France If France is selected, the TV controlling soft ware first sweeps all TV bands with France system selected

( positive video modulation) and the a second time with Europe system selected ( negative video modulation).

Special case : Switzerland If Switzerland is selected th e TV controlling software first sweeps all TV bands with Europe system selected (negative video modulation) and then a second time with France system selected ( positi ve video modulation).

Special case : GB Note for satellite receiver users : Before starting ATSS turn On your satellite receiver and tune “ SKY NEWS ”. If GB is selected the TV controlling software seeks for programs only in UHF ( C21 to C70 ). The sorting order is : 1 - BBC1 2 - BBC2 3 - ITV 4 - CH4 5 - CH5 6 - NEWS

If two or more “ identical” programs ( same name but different code e.g. BBC1 and BBC1 Scotland ) are found the following programs in the list will be shifted up. (1 - BBC1, 2 - BBC1, 3 - BBC2, 4 -ITV, 5 - CH4, 6 - CH5, 7 - NEWS, ..)

If one of the program above is not found, the associated program number remains empty ( freq.=467.25 Mhz - Skip selected - no name - system=GB). example A : 1 - BBC1, 2 - BBC2, 3 - ITV, 4 - ----, 5 - CH5, 6 - NEWS, ... example B ( if 2 BBC1 found ) : 1 - BBC1, 2 - BBC1, 3 - BBC2, 4 - IT V, 5 - -----, 6 - CH5, 7 -NEWS, ...

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Service manual WP 895/895F, CP885/885F, CP485F

2 - Safety instruction

WARNING: Only competent service personnel may carry out work involving the testing or repair of this equipment.

X-RAY RADIATION PRECAUTION

1.Excessive high voltage can produce potentially hazardous X-RAY RADIATION. To avoid such hazards, the high voltage must not exceed the specified limit. The nominal value of the high voltage of this receiver is 26 KV (21” - 29”) at max beam current. The high voltage must not, under any circumstances,

exceed 29.5 KV (21" - 25") or

should be checked.

2.The only source of X-RAY Radiation in this TV receiver is the picture tube. For continued X-RAY RADIATION protection, the replacement tube must be exactly the same type tube as specified in the parts list.

SAFETY PRECAUTION

1. Potentials of high voltage are present when this receiver is operating. Operation of the receiver outside the cabinet or with the back board removed involves a shock hazard from the receiver.

1)Servicing should not be attempted by anyone who is not thoroughly familiar with the precautions necessary

when working on high voltage equipment.

2)Discharge the high potential of the picture tube before handling the tube. The picture tube is highly evacuated

and if broken, glass fragments will be violently expelled.

2. If any Fuse in this TV receiver is blown, replace it with the FUSE specified in the Replacement Parts List.

3. When replacing a high wattage resistor ( metal oxide film resistor) in the circuit board, keep the resistor 10 mm away from circuit board.

4. Keep wires away from high voltage or high temperature components.

5. This receiver must operate under AC 220 ~ 240 volts, 5O Hz. NEVER connect to DC supply or any other power or

frequency.

It is important to use an accurate and reliable high voltage meter.

30 KV (28" - 29"). Each time a receiver requires servicing, the high voltage

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this equipment have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements, electrical components having such features are identified by designated symbol on the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitutes replacement parts which do not have the same safety characteristics as specified in the parts list may create X-RAY Radiation.

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Service manual WP 895/895F, CP885/885F, CP485F

3 - Alignment instructions

3-1 Microcontroller configuration : Service mode To switch the TV set into service mode please see instruction below.

1 - Select pr. number 91 2 - Adjust sharpness to minimum and exit all menu. 3 - Quickly press the key sequence : RED - GREEN - menu

To software version is displayed beside the word Service, e.g. “ SERVICE V1.00A”.

To exit SERVICE menu press menu key or Std By key.

3-2 Service mode na vigation Pr Up / Down remote keys : cycle through the service items available. Vol- / + remote keys : Decrement / Increment the values within rang e. 0~7 digit keys : Toggle bits 0~7 in option byte

Order Item

1 PARABOLA 2 HOR WIDTH 3 CORNER

4 HOR.PARAL 5 V.LINEAR 6 EW TRAPEZ 7 S CORRECT 8 H BOW 9 VERT SIZE

10 VERT CENT 11 RED GAIN 12 GRN GAIN 13 BLUE GAIN

14 RED BIAS 15 GRN BIAS 16 HOR CEN 17 AGC LEVEL

18 G2-SCREEN 19 AFT

20 OPTION

21 MAX VOL

Default settingh for wp 895

+140

-1100

-80

-1

-2

-12

-15 +100 +145

+3939

+92 +87

+95 +128 +128

Not used

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Service manual WP 895/895F, CP885/885F, CP485F

3-3 Microcontroller configuration : Option bits

VCT3834A C4 DWO2

VCT3832A C4 DW03

DW3834A-C4-AE2 DW3832A-C4-BE2

MICOM

Bits in OPTION Bits in OPTION2

USED

7, 6, 5, 2, 1,

7, 6, 5, 4, 2,

1, 0

NOT USED

(set to ‘0’)

4, 3 OPTION2 does not exist Up to, but not including

3 3, 2, 1, 0 7, 6, 5, 4 From V0.17 COB (ROM

USED

NOT USED

(set to ‘0’)

COMMENTS

COB version 0.14

No tuner option 11

(ROM V1.00 A/B)

V2.00 A/B)

There are two option bytes available (16 bits in all). These option bits are available from Service mode. First find the OPTION or OPTION2 control, and then use keys 0..7 on the remote keypad to control bits 0 to 7 respectively. The table below shows the two option bytes available;

OPTION1

B7 B6 B5 B4 B3 B2 B1 B0

Tuner options

00 = Philips

01 = ALPS

10 = Philips(AGC

intern)

11 = Daewoo

TOP text

off

TOP text

B7 B6 B5 B4 B3 B2 B1 B0

Y Y Y Y

FASTEXT

FLOF off

FASTEXT

(FLOF) on

TUBE 4:3

TUBE

16:9

AUTO 4:3

switch to

PANORAMA

AUTO 4:3

switch to 4:3

OPTION2

brightness

Normal I

Normal I +5 steps

SVHS3

disable

SVHS3

enable

See table below.

OPTION2 bits B2 B1 B0

B2 B1 B0

1 1 1 0.95 1.10

Beam Current (mA)

Nominal Max

Tube

28” 4:3 Normal (Philips, Thomson) 28” 16:9 Super Flat (Philips, Thomson)

1 1 0 1.00 1.15

1 0 1 1.05 1.20

1 0 0 1.10 1.25

0 1 1 1.20 1.44

0 1 0 1.25 1.49

0 0 1 1.30 1.53

0 0 0 0.90 1.05 21” 4:3 Real Flat (Philips)

Set all the unused bits, marked ‘X’, to be 0 for future compatibility. Set all the unused bits, marked ‘Y’, to be 1 for future compatibility.

- 15 -

28” 4:3 Normal (Tesla)

28” 16:9 Real Flat (Thomson) 29” 4:3 Real Flat (Thomson)

Service manual WP 895/895F, CP885/885F, CP485F

Entering Factory mode Option bits

To switch the TV set into FACTORY mode, use the factory remote control, and press on “SVC”. The factory menu will appear on the screen, showing “FACTORY Vx.xxX” (where x.xx is the software version) and X is the project. A is the correct project for WP895/895F, CP

To find the option bits, push the button “OPT” once. Then “00000000 OPTION” will appear (assuming that all bits are already zero) to indicate all 8 option bits. To find OPTION2 press the button “OPT” a second time. From left to right, bits 7 to 0 are shown.

Toggling option bits

This is done from the user remote control, as there are no unallocated keys available from the factory remote control. Each bit, from bit 7 to bit 0 is represented by its own key. Each key will, with repeated use, toggle on/off the

associated bit. See the table below for the keys to use.

Bit B7 B6 B5 B4 B3 B2 B1 B0

User

remote

control key

After setting option bits

Before pushing on the shipping key, “AGC”, it is necessary to push the “NORMAL” key to obtain NORMAL I. This will reset all the sound and brightness settings to a factory defined level, as well as some other settings such as sound PRESET and WAKE TIME/PROG. Then, on pushing the shipping key, these levels are memo rised in the television, ready for packing and delivery.

Text

HOLD

Text

SubPage

Mode

-485/885F, and B is for the CP885 chassis.

Text

Reveal

Text

Double

Height

Red Green Yellow Blue

Verification

On pushing the shipping “AGC” key, a four digit hexadecimal number is displayed in addition to “SHIPPING”. This number is there to verify the option bits setting that has been entered. For example the binary code 0000 0111 (OPTION2) 1100 0010 (OPTION) will give 07 C2 hex. The order of display is therefore OPTION2 then OPTION

when reading from left to right

3-4 TV set Alignment 3-4-1- Local oscillator alignment Tune a colour bar pattern. The frequency of the signal carrier must be accurate ( Max +/- 10Khz deviation from the nominal channel frequency). Find “AFT” item in service mode. Adjust the coil L150 to bring the cursor to central position : 32.

3-4-2- G2 alignment

- Tune a colour bar pattern.

- Find the “G2 - SCREEN” item in service mode.

- Adjust screen volume ( on FBT ) to bring the cursor to central position : 32.

3-4-3- White balance

- Select a dark picture and adjust RED BIAS and GRN BIAS to the desired colour temperature.

- Select a bright picture and adjust RED, GRN and BLUE GAIN to the desired colour temperature.

3-4-4- Focus Adjust the Focus volume ( on FBT ) to have the best resolution on screen.

3-4-5- Vertical geometry Adjust V.LINEAR (linearity), S CORRECT (S. Correction), VERT SIZE (Vertical amplitude), VERT CENT (vertical centring) to compensate for vertical distortion.

- 16-

Service manual WP 895/895F, CP885/885F, CP485F

3-4-6- Horizontal picture centring Adjust HOR CEN(Horizontal center) to have the picture in the center of the screen.

3-4-7- Eau/West comection Adjust the PARABOLA, HOR WIDTH, CORNER, HOR PARAL, EW TRAPEZ, H BOW, to compensate for geometrical distorrin,

HOR PARAL

H BOW

HOR WIDTH

PARAROLA

For HOR WIDTH, adjust for 91% overscan.

- 17 -

Service manual WP 895/895F, CP885/885F, CP485F

CORNER

EW TRAPEZ

3-4-8- AGC

- Adjust the antenna signal level at 70 dB V 2

- Tune a colour bar pattern.

- Find the “AGC” item in service mode.

- Adjust AGC volume ( RB10 ) to bring the cursor to central position : 32.

- 18 -

Service manual WP 895/895F, CP885/885F, CP485F

4 - IC description

4-1 VCT383XA TV signal processor - Teletext decoder with embedded 8 bit - Controller.

4-1-1- Block diagram of the VCT

4-1-2- TV-signal Processor

• Four composite video inputs, two S-VHS inputs

• Analogue YC r C b input

• Composite video monitor

• Multistandard colour decoder ( 1 crystal )

• Multistandard sync decoder

• Black-line detector

• Adaptive 2H comb filter Y/C separator

- 19 -

Service manual WP 895/895F, CP885/885F, CP485F

• Horizontal scaling ( 0.25 to 4 )

• Panoramavision

• Black-level expander

• Dynamic peaking

• Soft limiter (gamma correction)

• Colour transient improvement

• Programmable RGB matrix

• Analogue RGB/Fastblank input

• Half-contrast switch

• Picture frame generator

• Scan velocity modulation output

• High-performance H/V deflection

• Angle and bow correction

• Separate ADC for tube measurements

• EHT compensation

4-1-3- -Controller

• 8-bit, 10-Mhz CPU (65C02)

• 96 kB program ROM on chip

• 1 kB program RAM on chip

• memory banking

• 16-input, 16-level interrupt controller

• patch module for 10 ROM locations

• two 16-bit reloadable timers

• capture compare module

• watchdog timer

• 14-bit PWM for voltage synthesis

• Four 8-bit PWMs

• 10-bit ADC with 15:1 input MUX

• I2C bus master interface

• 24 programmable I/O ports

• 80C51

• 1 s machine cycle

• 32-128Kx8-bit late programmed ROM

• 3-12Kx8-bit Auxiliary RAM (shared with Display and Acquisition)

• Interrupt controller for individual enable/disable with two level priority

• Two 16-bit Timer/Counter registers

• WatchDog timer

• Auxiliary RAM page pointer

• 16-bit Data pointer

• IDLE and Power Down (PD) mode

• 14 bits PWM for Voltage Synthesis Tuning

• 8-bit A/D converter

• 4 pins which can be programmed as general I/O pin, ADC input or PWM (6-bit) output

-controller core standard instruction set and timing

4-1-4- Teletext Features

• Four programmable video inputs

• Adaptive data slicer

• Signal quality detection

• WST, PDC, VPS, and WSS acquisition

- 20 -

• High-level command language

• FLOF (Fastext), and TOP support

• 10 pages memory on chip (10kB)

4-1-5- Display OSD Features

• 3kB OSD RAM on chip

• WST level 1.5 compliant

• WST level 2 parallel attributes

• 32 foreground/background colours

• programmable colour look-up table

• 1024 mask programmable characters

• 17 national languages

• (Latin, Cyrillic and Greek caracter sets)

• Character matrix 10x10

• 4-color mode for user font

4-1-6- Audio Features

• Three mono inputs

• Two mono outputs

• Programmable channel select

• Volume control for one mono channel

Service manual WP 895/895F, CP885/885F, CP485F

4-1-7- General Features

• Submicron CMOS technology

• Low-power standby mode

• Single 20.25 MHz crystal

• 64-pin PSDIP package

4-1-8- Data Capture The Video Front End section takes in the analogue Composite Video and Blanking Signal (CVBS), and from this extracts the required data, which is then decoded and stored in memory.

The extraction of the data is performed in the digital domain. The first stage is to select and convert the analogue CVBS signal into a digital form. This is done using 8 bit ADC sampling at 20.25 Mhz.

The digital data services transmitted in the VBI are selected and acquired separately form the video part. This is done by the use of an adaptive data slicer. The following data types can be extracted : 625 line World System Teletext (WST), VPS, WSS. The data is acquired and decoded by the teletext decoder (TPU), then stored in an SRAM lnterface.

4-1-9- Data Capture Features

• Video Signal Quality detector

• Data Capture for 625 line WST

• Data Capture for VPS data (PDC system A)

• Data Capture for Wide Screen Signalling (WSS) bit decoding

• Real-time capture and decoding for WST Teletext in Hardware, to enable optimised microprocessor throughput

• 10 page memory stored On-Chip

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Service manual WP 895/895F, CP885/885F, CP485F

• Inventory of transmitted Teletext pages stored in the Page Table

• Signal quality detector for WST data

• Comprehensive Teletext language coverage

• Full Field Vertical Blanking Interval (VBI) data capture of WST data

4-1-10- TV processor version and -Controller capacity

IC version VCT 3832A VCT 3834A

-controller

8 bit ROM size 96k 96k RAM size 1k 1k PAL decoder SECAM decoder NTSC decoder Picture improvement Teletext page memory 10 pages 10 pages Adaptive Comb filter Panorama Scaler

4-1-11- IC marking and version

Chassis OSD languages

CP885 VCT3832A

IC marking

English, French, German, Italian, Spanish, Dutch,

CP885F VCT3834A

Danish, Finnish, Norwegian, Swedish,

WP895F/CP485F

VCT3834A

Greek, Polish, Hungarian, Czech,

WP895

VCT3834A

Slovakian, Romanian, Russian.

ATSS countries

GB, France, Germany, Italy, Belgium, Spain, Austria, Poland, Switzerland, Denmark, Finland, Netherlands, Norway, Sweden, Ireland, Hungary, Czech Republic, Others

4-1-12- Pinning

PSDIP 64-pin

1 Power OUT High = SMPS ON, Low = SMPS in stand by mode. 2 AGC IN For service only, tuner AGC, TOP alignment. 3 VSUPP1 SUPPLY Supply Voltage, Port ( pin 1, 2, 5, 6, 7, 8, 9, 10, 61, 62, 63, 64). 4 GNDP1 SUPPLY Ground, Port. 5 MOD_SW OUT High = Negative modulation, Low = Positive modulation (L/L’). 6 SECAM L/L’ OUT High = L’, Low = L. 7 AFC IN 8IR IN

9 SC1.SW IN 10 SC2.SW IN 11 VOUT OUT Analog Video Output 12 VRT IN Reference Voltage Top, Video ADC 13 SGND IN Signal Ground for Analog Input

Pin Name

Type

Short Description

Text

Pan-European Latin. Cyrillic, Greek.

- 22 -

Service manual WP 895/895F, CP885/885F, CP485F

PSDIP

64-pin

14 GNDAF SUPPLY Ground, Analog Front-end 15 VSUPAF SUPPLY Supply V oltage, Analog Front-end 16 CBIN IN Analog Component Cb Input 17 CIN1 IN Analog Chroma 1 Input 18 CIN2/CRIN IN Analog Chroma 2 Input / Analog Component Cr Input 19 VIN1 IN Analog Video 1 Input 20 VIN2 IN Analog Video 2 Input 21 VIN3 IN Analog Video 3 Input 22 VIN4 IN Analog Video 4 Input 23 TEST IN Test Pin, Reserved For Test 24 HOUT OUT Horizontal Drive Output 25 VSUPD SUPPLY Supply V oltage, Digital Circuitry 26 GNDD SUPPLY Ground, Digital Circuitry 27 FBLIN IN Fast Blank Input 28 RIN IN Analog Red Input 29 GIN IN Analog Green Input 30 BIN IN Analog Blue Input 31 VPROT IN Vertical Protection Input 32 SAFETY IN Safety Input 33 HFLB IN Horizontal Flyback Input 34 VER TQ/ INTLC OUT Differential Vertical Sawtooth Output Interlace Control Output 35 VER T OU T Differential Vertical Sawtooth Output 36 EW OUT Vertical Parabola Output 37 SENSE IN Sense ADC Input 38 GNDM SUPPLY Ground, MADC Input 39 RSW1 OUT Range Switch1 for Measurement ADC 40 RSW2 OUT Range Switch2 for Measurement ADC 41 SVMOUT OUT Scan V elocity Modulation Output 42 R OU T OUT Analog Red Output 43 GOUT OUT Analog Green Output 44 BOUT OUT Analog Blue Output 45 VSUPAB SUPPLY Supply V oltage, Analog Back-end 46 GNDAB SUPPLY Ground, Analog Back-end 47 VRD IN D AC Reference 48 XREF IN Reference Input for RGB DA Cs 49 AIN3 IN Analog Audio 3 Input 50 AIN2 IN Analog Audio 2 Input 51 AIN1 IN Analog Audio 1 Input 52 AOUT2 OUT Analog Audio 2 Output 53 AOUT1 OUT Analog Audio 1 Output 54 VSUPS SUPPLY Supply V oltage, Standby 55 GNDS SUPPL Y Ground, Standby 56 XTAL1 IN Analog Crystal Input 57 XTAL2 OUT Analog Crystal Output 58 RESQ IN/OUT Reset Input/Output, Activ e Lo w 59 SCL IN/OUT I 2 C Bus Clock 60 SDA IN/OUT I 2 C Bus Data 61 Mute OUT High = Mute active 62 LED OUT High = Green, Low = Red 63 KB IN Local keyboard ADC input 64 OCP IN Over Current Protection input

Pin Name

Type

Short Description

- 23 -

Service manual WP 895/895F, CP885/885F, CP485F

Power

AGC

S/B 5V

Gnd

MOD SW

SECAM L’

AFC/RES

SC1 SW

SC2 SW Vout

VRT

SGND

GND 5V

Cb in

C in Cr in

IF-IN SC1-IN

SC2-IN RCA VIN

TEST H out

3.3 V GND

FBLIN Rin

Gin Bin

VPROT SAFETY

VCT 383X

OCP KB

LED MUTE

SDA SCL

RESET XTAL in OSC GND GND S/B 3.3V

GND GND

GND XREF VRD

GND 5V

B out G out

R out SVM out

RSW2 RSW1

GND SENSE

EW VERTQ

VERT HFLB

- 24 -

Service manual WP 895/895F, CP885/885F, CP485F

4-2 MSP341x Multistandard Sound Processor The MSP 341x is designed as a single-chip Multistandard Sound Processor for applications in analogue and digital TV sets, video recorders, and PC cards.

The MSP3411 has all functions of MSP3410 with the addition of a virtual surround sound feature. A Surround sound affect can be rc produced with two loudspeakers. The MSP3411 includes virtualizer algorithm “3D Panorama” which has been approved by the Dolby laboratories for compliance with the “Virtual Dolby Surround” technology. In addition, the MSP3411 includes Micronas “Panorama” algorithm.

MSP 341x features :

- sound IF input

- No external filters required

- Stereo baseband input via integrated AD converters

- Two pairs of DA converters

- Two carrier FM or NICAM processing

- AVC : Automatic Volume Correction

- Bass, treble, volume processing

- Full SCART in/out matrix without restrictions

- Improved FM-identification

- Demodulator short programming

- Autodetection for terrestrial TV - sound standards

- Precise bit-error rate indication

- Automatic switching from NICAM to FM/AM or vice versa

- Improved NICAM synchronisation algorithm

- Improved carrier mute algorithm

- Improved AM-demodulation

- Reduction of necessary controlling

- Less external components

4-2-1- Basic Features of the MSP 341x

4-2-1-1 Demodulator and NICAM Decoder Section

The MSP 341x is designed to simultaneously perform digital demodulation and decoding of NICAM-coded TV stereo sound, as well as demodulation of FM or AM mono TV sound. Alternatively, two carrier FM systems according to the German terrestrial specs can be processed with the MSP 341x.

The MSP 341x facilitates profitable multistandard capability, offering the following advantages:

- Automatic Gain Control (AGC) for analogue input: input range: 0.10 - 3 Vpp

- integrated A/D converter for sound-IF input

- all demodulation and filtering is performed on chip and is individually programmable

- easy realisation of all digital NICAM standards (B/G, I, L and D/K)

- FM-demodulation of all terrestrial standards (include identification decoding)

- no external filter hardware is required

- only one crystal clock (18.432 MHz) is necessary

- 25 -

Service manual WP 895/895F, CP885/885F, CP485F

- high deviation FM-mono mode (max. deviation: approx. ±360 kHz)

4-2-1-2 DSP-Section (Audio Baseband Processing)

- flexible selection of audio sources to be processed

- performance of terrestrial de-emphasise systems (FM, NICAM)

- digitally performed FM-identification decoding and de-matrixing

- digital baseband processing: volume, bass, treble

- simple controlling of volume, bass, treble

4-2-1-3 Analogue Section

- two selectable analogue pairs of audio baseband input (= two SCART inputs) input level: <2 V RMS,

input impedance: >25

- one selectable analogue mono input (i.e. AM sound): Not used in this chassis

- two high-quality A/D converters, S/N-Ratio: >85 dB

- 20 Hz to 20 kHz bandwidth for SCART-to-SCART copy facilities

- loudspeaker: one pair of four-fold oversampled D/A converters. Output level per channel: max. 1.4 VRMS output resistance: max. 5 noise voltage in mute mode: < 10 V (BW: 20 Hz... 16kHz)

- one pair of four-fold oversampled D/A converters supplying a pair of SCART-outputs. output level per channel: max. 2 V RMS, output resistance: max. 0.5 , S/N-Ratio: >85 dB (20 Hz... 16 kHz)

4-2-1-4 NICAM plus FM/AM-Mono

. S/N-ratio: >85 dB at maximum volume Max.

According to the British, Scandinavian, Spanish, and French TV-standards, high-quality stereo sound is transmitted digitally. The systems allow two high-quality digital sound channels to be added to the already existing FM/AM-channel. The sound coding follows the format of the so-called Near Instantaneous Companding System (NICAM 728). Transmission is performed using Differential Quadrature Phase Shift Keying (DQPSK. Table below offers an overview of the modulation parameters.) In the case of NICAM/FM (AM) mode, there are three different audio channels available: NICAM A, NICAM B, and FM/AM-mono. NICAM A and B may belong either to a stereo or to a dual language transmission. Information about operation mode and about the quality of the NICAM signal can be read by the controlling software via the control bus. In the case of low quality (high bit error rate), the controlling software may decide to switch to the analogue FM/AMmono sound. Alternatively, an automatic NICAM-FM/AM switching may be applied.

4-2-1-5 German 2-Carrier System (DUAL FM System)

Since September 1981, stereo and dual sound programs have been transmitted in Germany using the 2-carrier system. Sound transmission consists of the already existing first sound carrier and a second sound carrier additionally containing an identification signal. More details of this standard are given in Tables below. For D/K very similar system is used.

- 26 -

Service manual WP 895/895F, CP885/885F, CP485F

TV standards

TV Position of sound Sound modulation Color system Country system carrier (MHz) B/G 5.5 / 5.7421875 FM Stereo PAL Germa ny B/G 5.5 / 5.85 FM-Mono / NICAM PA L Scandinavia,

Spain L 6.5 / 5.85 AM-Mono / NICAM SECAM-L France I 6.0 / 6.552 FM-Mono / NICAM PAL UK D/K 6.5 / 6.2578125 D/K1 FM Stereo SECAM-East USSR

6.5 / 6.7421875 D/K2

6.5 / 5.85 D/K-NICAM FM-Mono / NICAM Hungary

Architecture of MSP341x

Pin connections and short description

Pin No. Pin Name Typ e Short description 1 TP Out Test pin 2 NC Not Connected 3 NC Not Connected 4 TP Out Test pin 5 TP Out Test pin 6 ADR_SEL In I2C bus Address select 7 STANDBYQ In Standby ( Low-active) 8 NC Not Connected 9 I2C_CL In / Out I2C Clock 10 I2C_DA In / Out I2C data 11 TP In / Out Test pin

- 27 -

Service manual WP 895/895F, CP885/885F, CP485F

Pin No. Pin Name Typ e Short description

12 TP In / Out Test pin 13 TP Out Test pin 14 NC Not Connected 15 TP Out Test pin 16 TP Out Test pin 17 TP Out Test pin 18 DVSUP Digital power supply +5V 19 DVSS Digital Ground 20 NC Not Connected 21 NC Not Connected 22 NC Not Connected 23 NC Not Connected 24 RESETQ In Power-On-reset 25 NC Not Connected 26 NC Not Connected 27 VREF2 Reference ground 2 high voltage part 28 DACM_R Out Loudspeaker out Right 29 DACM_L Out Loudspeaker out Left 30 NC Not Connected 31 TP Out Test pin 32 NC Not Connected 33 NC Not Connected 34 NC Not Connected 35 VREF1 Reference ground 1 high voltage part 36 SC1_OUT_R O ut Scart output 1, right 37 SC1_OUT_L Out Scart output 1, left 38 NC Not Connected 39 AHVSUP Analog power supply 8.0V 40 CAPL_M Volume capacitor MAIN 41 AHVSS Analog ground 42 AGNDC Analog reference voltage high voltage part 43 NC Not Connected 44 NC Not Connected 45 NC Not Connected 46 NC Not Connected 47 NC Not Connected 48 ASG2 Analog Shield Ground 2 49 SC2_IN_L In Scart input 2 in, left 50 SC2_IN_R In Scart input 2 in, right 51 ASG1 Analog Shield Ground 1 52 SC1_IN_L In Scart input 1 in, left 53 SC1_IN_R In Scart input 1 in, right 54 VREFTOP Reference voltage IF A/D converter 55 MONO_IN In Mono input 56 AVS S Analog ground 57 AVSUP Analog power supply 58 ANA_IN1+ In IF input 1

- 28 -

Service manual WP 895/895F, CP885/885F, CP485F

Pin No. Pin Name Typ e Short description 59 A NA_IN1- In IF common 60 N C Not Connected 61 TESTEN In Test pin 62 XTAL_IN In Crystal oscillator 63 XTAL_OUT Out Crystal oscillator 64 NC Test pin

4-3 TDA 4470-Multistandard Video-IF and Quasi Parallel Sound Processor

4-3-1- Description The TDA 4470 is an integrated bipolar circuit for multi-standard video/sound IF (VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processes all TV video IF signals with negative modulation (e.g., B/G standard), positive modulation (e.g., L standard) and the A M, FM/NICAM sound IF signals.

4-3-2- Features

- 5V supply voltage ; low power consumption.

- Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation.

- Very linear video demodulation, good pulse response and excellent intermodulation figures.

- Alignment-free AFC without external reference circuit, polarity of the AFC curve is switchable.

- VIF-AGC for negative modulated signals (peak sync. detection) and for positive modulation (peak white/black level detector).

- Tuner AGC with adjustable take over point.

- Alignment-free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals.

- Intercarrier output signal is gain controlled (necessary for digital sound processing).

- Complete alignment-free AM demodulator with gain controlled AF output.

- Separate SIF-AGC with average detection

- Two independent SIF inputs

- Parallel operation of the AM demodulator and QPS mixer (for NICAM-L stereo sound).

4-3-3- Pinning

4,9,16 GND Ground

Pin Symbol Function

1,2 V

6,7 V

8C 10 R 11 I 12 V 13 V 14 V 15 C 17 C

i,SIF1

AGC i,VIF AGC TOP tun

O,VID

SW SW

ref

SIF1 input ( symmetrical) Input selector switch

SIF-AGC (time constant) VIF input (symmetrical) VIF-AGC (time constant) Take Over Point, tuner AGC Tuner AGC output current Video output Standard switch L’switch Black level capacitor Internal reference voltage

18 LF Loop Filter

- 29 -

+ 72 hidden pages

DAEWOO WP-895, WP-895F, CP-885, CP-885F, CP-485F Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual