Daewoo WP-895, CP-885, CP-885F, WP-895F User Manual

0 (0)

S/M No. : TWP895BEF0

Service Manual

Colour Television

CHASSIS

WP-895

WP-895F

CP-885

CP-885F

DAEWOO ELECTRONICS CO., LTD

http : //svc.dwe.co.kr

AUG. 2001

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

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 .............................................................................................................................................		15
3-4-1	Local oscillator alignment ....................................................................................................................	15
3-4-2	G2 alignment .......................................................................................................................................	15
3-4-3	White balance .....................................................................................................................................	15
3-4-4 Focus ..................................................................................................................................................		15
3-4-5	Vertical geometry ................................................................................................................................	15
3-4-6	Horizontal picture centring...................................................................................................................	16
3-4-7	East/West correction ...........................................................................................................................	16

3-4-8 AGC ....................................................................................................................................................		17
4 - IC description .......................................................................................................................................................		18
4-1 VCT383xA TV signal processor - Teletext decoder with embedded 8 bit		-
Controller	............................................................................................................................................................	18
4-1-1 Block diagram off the VCT ...................................................................................................................		18
4-1-2	TV-signal Processor ...........................................................................................................................	18
4-1-2	-Controller .........................................................................................................................................	19
4-1-4	Teletext Features ................................................................................................................................	19
4-1-5	Displaty OSD Features ......................................................................................................................	20
4-1-6	Audio Features ...................................................................................................................................	20
4-1-7	General Features ...............................................................................................................................	20
4-1-8	Data Capture .......................................................................................................................................	20
4-1-9	Data Capture Features ........................................................................................................................	20
4-1-10 TV processor version and -Controller capacity ..............................................................................		21
4-1-11 IC marking and version .......................................................................................................................		21
4-1-12 Pinning ................................................................................................................................................		21
4-2 MSP341x Multistandard Sound Processor ...................................................................................................		24
4-2-1 Basic Features of the MSP 341x .........................................................................................................		24
4-3 TDA4470 - Multistandard Video-IF and Quasi Parallel Sound Processor ......................................................		28
4-3-1 Description ..........................................................................................................................................		28
4-3-2 Features ..............................................................................................................................................		28
4-3-3 Pinning ................................................................................................................................................		28
4-3-4	Block diagram ....................................................................................................................................	29
4-4 TDA894xJ Stereo Audio Amplifier .................................................................................................................		30
4-4-1 Features ...............................................................................................................................................		30
4-5 TDA835xJ Vertical Amplifier ...........................................................................................................................		32
4-5-1	TDA8357J ...........................................................................................................................................	32

- 1 -

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

4-5-2 TDA8358J ..............................................................................................................................................		33
4-6 TDA6107Q ..........................................................................................................................................................		34
4-7 24C16 - 16 Kb EEPROM ....................................................................................................................................		37
4-8 STR - F6653 .......................................................................................................................................................		38
4-8-1	General description ...............................................................................................................................	38
4-8-2	Features .................................................................................................................................................	38
4-8-3	Block diagram .......................................................................................................................................	38
4-8-4	Pin description ......................................................................................................................................	39
4-8-5	Control part - electrical characteristics .................................................................................................	39
4-8-6	MOSFET electrical characteristics .......................................................................................................	40
5 - Circuit description ..................................................................................................................................................		41
5-1 Block diagram ....................................................................................................................................................		41
5-2 IF section ............................................................................................................................................................		42
5-2-1	Block diagram .......................................................................................................................................	42
5-2-2	Vision IF Amplifier ..................................................................................................................................	42
5-2-3	Tuner-and VIF-ACG ................................................................................................................................	43
5-2-4	FPLL, VCO and AFC ..............................................................................................................................	43
5-2-5	Video Demodulation and Amplifier ......................................................................................................	44
5-5-6	Sound IF Amplifier and SIF-AGC .......................................................................................................	44
5-2-7	Quasi-Parallel-Sound (QPS) Mixer .........................................................................................................	44
5-2-8	Standard Switch ....................................................................................................................................	44
5-2-9	L’ Switch ..................................................................................................................................................	44
5-2-10 Internal Voltage Stabiliser .....................................................................................................................		44
5-3 Video - VCT description ......................................................................................................................................		45
5-3-1	Introduction ............................................................................................................................................	45
5-3-2	Video Front-end .....................................................................................................................................	45
5-3-3	Input Selector ........................................................................................................................................	45
5-3-4 Clamping ................................................................................................................................................		45
5-3-5	Automatic Gain Control ........................................................................................................................	45
5-3-6	Digitally Controlled Clock Oscillator .....................................................................................................	45
5-3-7	Analogue Video Output ........................................................................................................................	45
5-3-8	Adaptive Comb Filter (VCT3834A only) ................................................................................................	46
5-3-9	Color Decoder .......................................................................................................................................	46
5-3-10 Horizontal Scaler ...................................................................................................................................		46
5-3-11 Video Sync Processing ........................................................................................................................		47
5-3-12 Display Processing ................................................................................................................................		47
5-3-13 Chroma Transient Improvement ............................................................................................................		47
5-3-14 Video Back-end .....................................................................................................................................		47
5-3-15 CRT Measurement and Control ...........................................................................................................		48
5-3-16 Average Beam Current Limiter .............................................................................................................		48
5-3-17 Analogue RGB Insertion ......................................................................................................................		48
5-3-18 Fast-Blank Monitor ................................................................................................................................		48
5-3-19 Vertical and East/West Deflection .......................................................................................................		49
5-3-20	EHT Compensation ................................................................................................................................	49
5-3-21 Reset Function ......................................................................................................................................		49
5-3-22 Standby and Power-On ........................................................................................................................		49
5-4 Micro-controller ...................................................................................................................................................		49

- 2 -

	Service manual WP-895/895F. CP885/885F
5-4-1	Introduction...........................................................................................................................................	49
5-4-2 CPU ......................................................................................................................................................		49
5-4-3 -Controller I/O pin configuration and function ...............................................................................		50
5-4-4 Tuning ..................................................................................................................................................		50
5-4-5	Automatic Format switching and WSS ...............................................................................................	50
5-4-6	EXTERNAL source control logic...........................................................................................................	51
5-4-7	Over Current Protection........................................................................................................................	53
5-5Teletext Display .................................................................................................................................................		53
5-6 Sound processing...............................................................................................................................................		54
5-6-1	Analogue sound IF-input section............................................................................................................	54
5-6-2	Quadrature Mixers ................................................................................................................................	54
5-6-3	Phase and AM discr imination...........................................................................................................	54
5-6-4	NICAM decoder....................................................................................................................................	55
5-6-5	DSP section..........................................................................................................................................	55
5-6-6	Sound Mode switching..........................................................................................................................	55
5-7 Sound amplification...........................................................................................................................................		55
5-7-1	Power amplifier.....................................................................................................................................	55
5-7-2	Mode selection.......................................................................................................................................	56
5-8 Vertical deflection.............................................................................................................................................		56
5-8-1	Flyback voltage.....................................................................................................................................	56
5-8-2 Protection..............................................................................................................................................		56
5-8-3	Guard circuit..........................................................................................................................................	56
5-8-4	Damping resistor...................................................................................................................................	56
5-8-5	EAST-WEST Amplifier (TDA8358J only)...............................................................................................	56
5-9 Power supply (STR F6653).. ..............................................................................................................................		57
5-9-1	STR-F6654 genera al description.........................................................................................................	57
5-9-2	Power supply primary par t operations...................................................................................................	57
5-10TV start-up, TV normal run and stand by mode operations...............................................................................		61
5-10-1 TV start-up operations..........................................................................................................................		61
5-10-2 TV normal run and stand-by mode operations.......................................................................................		62
6 - Service parts list...................................................................................................................................................		67
7 - ExplodedView ........................................................................................................................................................		75
7-1DWX-28W5 .......................................................................................................................................................		75
7-2DWF-28W8 .......................................................................................................................................................		76
7-3DTF-29U8 .......................................................................................................................................................		77
7-4DTP-28A7 .......................................................................................................................................................		78
7-5DTP-28B1 .......................................................................................................................................................		79
7-6DTP-28G7 .......................................................................................................................................................		80
7-7DTP-28G8 .......................................................................................................................................................		81

8 - PCB Layout

9 - Circuit Diagram

- 3 -

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

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 Power	21” : 4.5W x 2 (at 1kHz, 60% mod, 10%THD)
	28”, 29" : 7W x 2 (at 1kHz, 60% mod, 10%THD)
Speaker	21” : 7W 8 ohm x2
	28”, 29” : 12W 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	21” : 51 cm
	28” : 66 cm
	29” : 68 cm
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
	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.

Remote Control Unit	R-46G22

- 4 -

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

Specification matrix

CHASSIS NAME

WP895

WP895F

CP885

CP885F

VCT VERSION

3834

3832

3834

SOFTWARE VERSION

REMOTE CONTROL

R46G22

PCB SERIAL NUMBER

4859805093

4859805193

4859805093

4859805193

TUBE

16:09

16:9 REAL FLAT

4:03

4:3 REAL FLAT

SVHS3

"PICTURE IMPROVE-

MENTS, COMB FILTER,

HORIZONTAL SCALER"

TELETEXT SPLIT SCREEN

FORMATS AVAILABLE IN

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

AUTO / FULL SCREEN / 14:9 /

VIDEO MODE

ZOOM 16:9 / FULL SCREEN

16:9

16:9 / WATERGLASS

AV2 MONITOR OUTPUT

MSP VERSION (OPTION)

3410

3411

3410

3411

3410

3415

3410

3411

SOUND EFFECTS

OFF / SPATIAL

/ PANORAMA /

VIRTUAL

DOLBY

GRAPHIC EQUALIZER

AV3 AUDIO INPUT

DEDICATED

AV2 COMMON

DEDICATED

TELETEXT PAGE MEMORY

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

"Pan-European Latin, Cyrillic, Greek"

SUPPORT

OSD LANGUAGES

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

nian, Russian."

TUNER OPTIONS

"Philips, ALPS"

- 5 -

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

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 )

4Audio Earth

5Blue Earth

6	Audio Input Left	0.5 Vrms, Impedance > 10
7	Blue Input	0.7 Vpp ±0.1 V, 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

12N.C.

13Red Earth

14Blanking 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

17Video Out Earth

18Video 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

4Audio Earth

5Earth

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.

10N.C.

11N.C.

12N.C.

13Earth

14Earth

15 Chroma Input

3dB for a luminance signal of 1 Vpp

16N.C.

17Earth

18Video In Earth

- 6 -

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

Video Output

1 Vpp

3dB, Impedance 75 ( Monitor output ) - Not available for cp885

Video Input, Y In.

1 Vpp

3dB, Impedance 75

Common Earth

- 7 -

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

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

- 8 -

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

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

- 9 -

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

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

- 10 -

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

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 availab le, 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 pro grams 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 pro grams with a strong signal strength which are not listed in group I. Group III : It contains all the pro grams 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	Group	Skip
	number	Group	Skip
	number
1
2		Group I
...
	n
	n+1
...		Group II
	m
	m+1
...		Group III
	p
	p+1
...		Group IV
	q
	q+1
....		not used
	99
0

Program	Group	Skip
number	Group	Skip
number
1
...	Group II
m
m+1
	Group III
...	Group III
p
p+1
	Group IV
...	Group IV
q
q+1
	not used
....	not used
99
0

Special case : Country selection = Others

Special case : France

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

- 11 -

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

The sor ting order within group II, III, and IV is based on the channel frequency. The Pro gram with the lo west frequency is allocated the first rank in its group, and so f orth until the last program of the group which has the highest fr equency.

Special case : France

If France is selected, the TV controlling softw are f irst swe e ps all TV bands with Fr ance system selected

( positi ve video modulation) and the a second time with Europe system selected ( nega tive video modulation).

Special case : Switzerland

If Switzerland is selected the TV controlling softw are f irst s we e ps all TV bands with Eur ope system selected (ne ga tive video modulation) and then a second time with France system selected ( positive video modulation).

Special case : GB

Note for sa tellite recei ver users : Before starting ATSS tur n On your satellite r ecei ver 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” pr ograms ( same name but different code e.g. BBC1 and BBC1 Scotland ) are found the f ollowing pro grams 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 progr am abo ve is not f ound, 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 - NEW S , ...

example B ( if 2 BBC1 found ) : 1 - BBC1, 2 - BBC1, 3 - BBC2, 4 - IT V, 5 - -----, 6 - CH5, 7 -NEWS, ...

- 12 -

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

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 (25” - 28”) at max beam curr ent. The high voltage must not, under any circumstances,

exceed 29.5 KV (25") or 30 KV (28"). Each time a receiver requires servicing, the high voltage should be checked. It is important to use an accurate and reliable high voltage meter.

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 230 volts, 5O Hz. NEVER connect to DC supply or any other power or frequency.

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.

- 13 -

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

3 - Alignment instructions

3-1 Microcontroller con figuration : 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 men u press men u key or Std By key.

3-2 Service mode navigation
Pr Up / D own remote keys		: cycle through the service items availa ble.
Vol- / + remote keys		: Decrement / Increment the values within range.
0~7 digit keys		: Toggle bits 0~7 in option byte

	Order	Item	Default settingh for wp 895
	1	PARABOLA	+140
	2	HOR WIDTH	-1100
	3	CORNER	-80
	4	HOR.PARAL	-1
	5	V.LINEAR	-2
	6	EW TRAPEZ	-12
	7	S CORRECT	-15
	8	H BOW	+100
	9	VERT SIZE	+145
	10	VERT CENT	+3939
	11	RED GAIN	+92
	12	GRN GAIN	+87
	13	BLUE GAIN	+95
	14	RED BIAS	+128
	15	GRN BIAS	+128
	16	HOR CEN	98
	17	AGC LEVEL	-
	18	G2-SCREEN	-
	19	AFT	-
	20	OPTION	-
	21	MAXV OL	Not used

- 14 -

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

3-3 Microcontroller con figuration : Option bits

These option bits are availa ble from Service mode. First find the OPTION control, and then use keys 0...7 on the remote keypad to control bits 0 to 7 respect ively. The table below shows the options availa ble ;

	B7	B6	B5	B4	B3	B2		B1	B0
1	TOP text	FASTEXT	TUBE 4:3	X	X	SVHS3	Tuner options
	off	/FLOF off				disable	00	= Philips
							01	= ALPS
	TOP text	FASTEXT				SVHS3
0			TUBE 16:9	X	X		10	= Philips ( AGC intern)
	on	(FLOF) on				enable	11	= Not used.

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

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 d eviation 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- Vertica l geometry

Adjust V.LINEAR (linear ity), S CORRECT (S. Correction), VERT SIZE (Vertical amplitude), VERT CENT (v ertical cent ring) to compensate for vertical distortion.

- 15 -

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

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 For HOR WIDTH, adjust for 91% overscan.

PARAROLA

- 16 -

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

CORNER

EW TRAPEZ

3-4-8- AGC

-Adjust the antenna signal level at 70 dBV 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.

- 17 -

Daewoo WP-895, CP-885, CP-885F, WP-895F User Manual

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

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

- 18 -

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

•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 -controller core standard instruction set and timing

•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

4-1-4- Teletext Features

•Four programmable video inputs

•Adaptive data slicer

•Signal quality detection

•WST, PDC, VPS, and WSS acquisition

- 19 -

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

•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

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

- 20 -

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

•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

8 bit -controller

ROM size

96k

RAM size

PAL decoder

SECAM decoder

NTSC decoder

Picture improvement

Teletext page memory

10 pages

Adaptive Comb filter

Panorama Scaler

4-1-11- IC marking and version

Chassis

IC marking

OSD languages

ATSS countries

Text

CP885

VCT3832A

English, French,

GB, France, Germany,

German, Italian,

Italy, Belgium, Spain,

CP885F

VCT3834A

Spanish, Dutch,

Austria, Poland,

Danish, Finnish,

Switzerland, Denmark,

Pan-European Latin.

Norwegian, Swedish,

Finland, Netherlands,

Cyrillic, Greek.

WP895F

VCT3834A

Greek, Polish,

Norway, Sweden,

Hungarian, Czech,

Ireland, Hungary,

WP895

VCT3834A

Slovakian, Romanian,

Czech Republic, Others

Russian.

4-1-12- Pinning

PSDIP

Pin Name

Type

Short Description

64-pin

Power

OUT

High = SMPS ON, Low = SMPS in stand by mode.

AGC

For service only, tuner AGC, TOP alignment.

VSUPP1

SUPPLY

Supply Voltage, Port ( pin 1, 2, 5, 6, 7, 8, 9, 10, 61, 62, 63, 64).

GNDP1

SUPPLY

Ground, Port.

MOD_SW

OUT

High = Negative modulation, Low = Positive modulation (L/L’).

SECAM L/L’

OUT

High = L’, Low = L.

AFC

SC1.SW

SC2.SW

VOUT

OUT

Analog Video Output

VRT

Reference Voltage Top, Video ADC

SGND

Signal Ground for Analog Input

- 21 -

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

PSDIP	Pin Name	Type	Short Description
64-pin	Pin Name	Type	Short Description
64-pin
14	GNDAF	SUPPLY	Ground, Analog Front-end
15	VSUPAF	SUPPLY	Supply Voltage, 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 Voltage, 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	VERTQ/ INTLC	OUT	Differential Vertical Sawtooth Output Interlace Control Output
35	VERT	OUT	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 Velocity Modulation Output
42	ROUT	OUT	Analog Red Output
43	GOUT	OUT	Analog Green Output
44	BOUT	OUT	Analog Blue Output
45	VSUPAB	SUPPLY	Supply Voltage, Analog Back-end
46	GNDAB	SUPPLY	Ground, Analog Back-end
47	VRD	IN	DAC Reference
48	XREF	IN	Reference Input for RGB DACs
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 Voltage, Standby
55	GNDS	SUPPLY	Ground, Standby
56	XTAL1	IN	Analog Crystal Input
57	XTAL2	OUT	Analog Crystal Output
58	RESQ	IN/OUT	Reset Input/Output, Active Low
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

- 22 -

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

1Power

2AGC

3S/B 5V

4Gnd

5MOD SW

6SECAM L’

7AFC/RES

8IR

9SC1 SW

10SC2 SW

11Vout

12VRT

13SGND

14GND

155V

16Cb in

17C in

18Cr in

19IF-IN

20SC1-IN

21SC2-IN

22RCA VIN

23TEST

24H out

253.3 V

26GND

27FBLIN

28Rin

29Gin

30Bin

31VPROT

32SAFETY

VCT 383X

64	OCP
63	KB
62	LED
	MUTE
61	MUTE
60	SDA
59	SCL
	RESET
58	RESET
	XTAL in
57	XTAL in
	OSC GND
56	OSC GND
	GND
55	GND
	S/B 3.3V
54	S/B 3.3V

53

52
	GND
51	GND
	GND
50	GND
	GND
49	GND
	XREF
48	XREF
	VRD
47	VRD
	GND
46	GND
	5V
45	5V
	B out
44	B out
	G out
43	G out
	R out
42	R out
41	SVM out
40	RSW2
39	RSW1
38	GND
37	SENSE
36	EW
35	VERTQ
34	VERT
33	HFLB

- 23 -

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

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 rproduced 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

- 24 -

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

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

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.

- 25 -

+ 60 hidden pages