Sanyo C28W1 Manuel utilisateur

Part No. SKSM0216 F2HT/HV SEPTEMBER 1997

Colour Television Service Manual Model C28W1(Europe)

C28WN1(Europe)

Service Ref. No. C28W1-00

Service Ref. No. C28WN1-00

Give complete "SERVICE REF. NO." for parts order or

servicing, it is shown on the rating sheet on the

cabinet back of the TV set.

Note

This TV receiver will not work properly in foreign

countries where the television transmission system

and power source differ from the design specifications.

Refer to the specifications for the design specifications

PRODUCT CODE

1113 29315 (C28W1)

1113 29316 (C28WN1)

ORIGINAL VERSION

Chassis No. WB2-B

Contents

Safety notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Pin configuration of system control, CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Chassis block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-6

IC block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-12

Adjustment locations on the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-15

Service control adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Circuit alignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Adjustments in the service mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-20

Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Cabinet parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Electrical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23-37

-2- F2HT

SAFETY PRECAUTION

X-RADIATION PRECAUTION

The primary source of X-RADIATION in the television receiver is the picture tube. The picture tube is specially

constructed to limit X-RADIATION emissions. For continued X-RADIATION protection, the replacement tube must

be the same type as the original including suffix letter. Excessive high voltage may produce potentially hazardous

X-RADIATION. To avoid such hazards, the high voltage must be maintained within specified limit. Refer to this

service manual, high voltage adjustment for specific high voltage limit. If high voltage exceeds specified limits,

take necessary corrective action. Carefully follow the instructions for +B1 volt power supply adjustment, and high

voltage adjustment to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when a component replacement is made in any area of a receiver.

Components indicated by mark //!\ in the parts list and the schematic diagram designate components in which

safety can be of special significance. It is particularly recommended that only parts designated on the parts list in

this manual be used for component replacement designated by mark /!\ . No deviations from resistance wattage

or voltage ratings may be made for replacement items designated by mark /!\ .

1: An isolation transformer should be connected in the

power line between the receiver and the AC line when

a service is performed on the primary of the converter

transformer of the set.

2: Comply with all caution and safety-related notes

provided on the cabinet back, inside the cabinet, on

the chassis or the picture tube.

3: When replacing a chassis in the cabinet, always be

certain that all the protective devices are installed

properly, such as, control knobs, adjustment covers or

shields, barriers, isolation resistor-capacitor networks

etc.Before returning any television to the customer,

the service technician must be sure that it is

completely safe to operate without danger of electrical

shock.

Specifications (C28W1/C28WN1)

Power source AC 220~240V 50Hz

Television system System B/G)

Colour system PAL

Receiving channel VHF E2~E12

UHF 21~69

CATV S1~S41, X,Y,Z, Z+1, Z+2

Common Specifications

Aerial input impedance 75ohm

AV terminal

21 Pin socket AV1 CENELEC standard<RGB/,S-in>

AV2 CENELEC standard

Front AV terminal AV3 RCA type,Video,Audio-L/R input

Sound output Main 10 watts X2

Picture tube 70cm diagonal, 106 degree

(Visible picture diagonal) 66cm

Dimensions (WxHxD) 739 x 494 x 485 mm

Weight 38.5 Kg

SPECIFICATIONS

SAFETY NOTICE

-3-

F2HT

PIN CONFIGURATION OF SYSTEM CONTROL, CPU

I DENT

CHROMA ID

KEY IN

RC SIGNAL

COLOUR

BRIGHTNESS

CONTRAST

SHARPNESS

SCLK

DATA

I2C BUS SW.

SYNC ID

PAL/NTSC

THRESH HOLD

CLK

AFT

I2C SCL

I2C SDA

OSC

Vcc +5V

H-SYNC

V-SYNC

OSD RED

OSD GREEN

OSD BLUE

OSD BLANKING

POWER ON/OFF

LED DRIVE

AV1 SW

AV2 SW

SOUND MUTE

LINE MUTE

SC1 FUNCTION

SC2 FUNCTION

POWER FAILURE DET.

IGNORE

TITLE IN

PITTARI

NORMAL

IC801

M37207MB-

TO SUB VIDEO

BOARD

TO Y/C SEPARATION

BOARD

D/A

CONVERTER

CIRCUITS

IDENT 4

COLOUR 26

BRIGHT 17

CONTRAST 25

SHARPNESS 14

AFT 44

IC101

TDA8361

FBP

SANDCASTLE PLS

Q203,

Q204,

Q205

TO IC201-

PIN21

TO IC1001

PINS 6, 12

FROM

SCART1, 2

DEFLECTION

BOARD

SYSTEM CONTROL

-4- F2HT

A101

TUNER PACK

Q101 X101

SAW

IC101

TDA8361

IC270

TDA4661

<1H DELAY>

Q122 SIF TRAP

Q135

Q132

Q134

EQUALISER

AV1

AV2

AV3 VIDEO-IN

VIDEO-IN

R/G/B/BLK-IN

IC1001

TA8747N

AV1

AV2

FROM

CPU

BACK BOARD

TELETEXT BOARD

CRT BOARD

TV-IN

MONITOR-OUT

Y-OUT

C-OUT

R/G/B/BLK-OUT

R/G/B-IN

Y-IN

C-IN

BLK-IN

VIDEO-IN(INTERNAL)

VIDEO-OUT

R/G/B-OUT

R/G/B/BLK FOR OSD FROM CPU

Q203

Q204

Q205

R/G/B BUFFER

R/G/B

R-Y/B-Y-OUT

R-Y/B-Y-IN

CRT

Q2761

Q2772

Q2782

VIDEO-OUT

12 22

2313

VIDEO-IN

BLOCK DIAGRAM <VIDEO SIGNAL PROCESSING>

CHASSIS BLOCK DIAGRAMS

-5-

F2HT

A101

TUNER PACK

Q101

IC3801

SIF

IC3811

A2 STEREO

IC101

IF/VIDEO/CHROMA

IC3401

DUAL SOUND

IC3451

NICAM

IC001

AUDIO OUTPUT

FOR FRONT

FRONT

L SPEAKER

FRONT

R SPEAKER

IC1001

AV SELECTOR

BLOCK DIAGRAM < AUDIO SIGNAL PROCESSING>

SIF BOARD

BACK BOARD

NICAM

BOARDD

16 12 1

AF1

AF2

NICAM

MONO.

SIF

MAIN

SUB

AV1

AV2

AV3

TV-L

TV-R

AV1-L

AV2-L

AV3-L

AV1-R

AV2-R

AV3-R

HEADPHONES

IC3501

3D SURROUND

IC3451

AMP

Monitor-out

TV-out

-6- F2HT

IC101

VIDEO/CHROMA/DEFLECTION

Q402

T401

H-DRIVE

Q403

H-OUTPUT

C421

C422

C465

T402

FLYBACK

HIGH

VOLTAGE

L461

Q421

S-C

IC423

PCC

Q461

Q462

ABL

C424 C425

C426

C427

DELECTION

YOKE

HORIZ.

VERT.

C512

R512

IC501

V-OUTPUT

IC521

PCC

IC531

V-DRIVE

NORMAL/

PITTARI

MODE SW

FROM CPU

42 13

SCL

SDA

I2C BUS

V-FEEDBACK

V-DRIVE

H-DRIVE

PCC

V-TRIGGER

BLOCK DIAGRAM <H&V DEFLECTION>

VR371

H-CENTRE

-7-

F2HT

IC BLOCK DIAGRAMS

AMPLIFIER AGC VERTICAL

OUTPUT PHASE 1

DEMODULATOR AFC AND

SAMPLE

AND HOLD VERTICAL

DIVIDER LINE

OSCILLATOR

VIDEO

IDENTIFICATION VIDEO

AMPLIFIER POWER

RESET H AND V

SEPARATION

NOISE

DETECTOR

PREAMPLIFER

MUTE

SWITCH

VOLUME

PHASE 2 XTAL

OSCILLATOR HUE

CONTROL

TUNING SYSTEM

MANAGER PHASE

DETECOR

DEMODULATOR

COLOUR

KILLERS

COINCIDENCE

DETECTOR

ACC

AMPLIFIER MATRIX CLAMPS

SET

CLAMP

SWITCH

OUTPUT

STAGES

LUMINANCE

MATRIX

CHROMINANCE

BANDPASS

PWL

Y DELAY

PEAKING

CHROMINANCE

SWITCH

LUMINANCE

SWITCH

TRAPAND

BYPASS

TUNING

PLL

TEST

LIMITER

SUPPLY

IF IN1

IF IN2

TUNE ADJ

FM DEM1

FM DEM2

AUDEM

EXTAU

SOIF

DEC

DIG

GND2 GND3 Vp DEC

CHROMA CVBS

EXT PEAK IN CON

COLOURRGBIN BRI

FROM

TDA4661

DET

HUE

XTAL OUT

XTAL2

XTAL1

H OUT

FBI/SCO

PH2LF

H OSC

PH1LF

V RAMP

VFB

V OUT

AFCOUT

DEC

AGC

AGC OUT

AU OUT

IDENT

11 9 10 52 12 16 13 15 14 25 26 21 17

3235

3437

41434448

4750

TDA8361

BYI

BYO

RYI

IFVO

CVBS

INT

DEC BG

DECDEM

TDA8361 <IF/VIDEO/CHROMA/DEF.>

-8- F2HT

SIGNAL

CLAMPING LINE

MEMORY SAMPLE-

AND-

HOLD LP

DIVIDER

BY 2

6 MHz

CCO

SAMPLE-

AND-

HOLD

LINE

MEMORY

DIVIDER

BY 192

FREQUENCY

PHASE

DETECTOR

SIGNAL

CLAMPING

SANDCASTLE

DETECTOR

10 134,8

GND1 Vp2 GND2

7 i.c.

n.c.

±(B-Y)

±(R-Y)

TDA4661

addition

stages output

buffers

colour-difference

output sugnals

±(R-Y)

±(B-Y)

colour-difference

input signals pre-amplifiers

analogue supply

digital supply

sandcstle

pulse input

Vp1 3MHz shifting clock

TDA4661 <1H DELAY LINE>

AGC

RAMP PULSE

SHAPER TRIGGER PULSE INFERFACE

∫

CORRECT LINEARUTY

CORRECTION S-C CORR.

PALABOLA

CORR. ETH

CORR.

16 15 14 13 12 11 10 9

654

TA8859AP

ETH IN

VERT

F/B

GND

F/B

Vcc

ETH

DRIVE

VERT.

DRIVE

SCL

SDA

TRIG

TA8859AP <DEFLECTION CORRECTION>

GND

VERTICAL

DRIVE VERTICAL

OUTPUT V-OUTPUT

VCC

15 LA7833

THERMAL

PROTECTION

PUMP UP

V-DRIVE PLS

INPUT

LA7833 <VERTICAL OUTPUT>

-9-

F2HT

AMP2

12 3456789101112

AMP1

SPEAKER SPEAKER

OUT1

OUT2

AUDIO

IN2

AUDIO

IN1

RIPPLE

FILTER

TA8200AH

GND

VCC

TA8216H/TA8200AH<AUDIO OUTPUT>

CLAMP

DECODER

COMB

FILTER

MUTE MUTE

AUDIO

VIDEO

X2 X2 X2

÷2

MONITOR OUT

Y OUT

Y IN

C IN

C OUT

L OUT

R OUT

SW1

SW2

SW3

MUTE

MODE OUT

GND

RE3

RE4

Vcc

RTV

RE1

RE2

LE2

LE3

LE4

LTV

LE1

Y 3

32 16 10 420 34 14 8 2 19 36 17 11 515 9 313 71 21 35

2726

612

TA8747N

R IN L IN VIDEO IN

C IN Y IN

TA8747N <AV SELECTOR>

-10- F2HT

7-STAGE

LIMITTER

AMPLIFIER 1

7-STAGE

LIMITTER

AMPLIFIER 2

SUPPLY

VCO1

VCO2

5.5MHz (B/G)

5.74MHz (B/G)

INTERCARRIER

VCOREF

Vp OPTIONAL STEREO

CHANNEL SEPARATION

ADJUSTMENT

VAF2

VAF1

13 14 12 11 MUTE 10

TDA9821

TDA9821 <DUAL CHANNEL SOUND DEMODULATOR>

DEMODU-

LATOR

DEMO.

TDA2546A

REF.

AMP.

AGC

DEMO.

LIMITER

AMP.

1st Sound IF &

Demodulator LIMITER

AMP.

2nd Sound IF

& FM Demo.

314 12 13 11 5

INPUT

MUTE

OUTPUT

5.5MHz

(5.742MHz)

38.9MHz

5.5MHz

(5.742MHz)

External

FM demodulator

TDA2545A <SIF DEMODULATOR>

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