Sanyo C21LB25S Manuel utilisateur

SERVICE MANUAL Colour Television

Product Code: 1 113 549 04 (C21LB25S)

1 113 550 04 (C29LK35)

Original Version

Chassis Series: LA4-A

C4BE/C4BES/C4CE

FILE NO.

Model No. C21LB25S

C29LK35

Service Ref. No. C21LB25S-00

C21LB25S-01

C29LK35-00

(Argentina)

Give complete “SERVICE REF. NO.” for parts

order or servicing. It is shown on the rating

plate at the cabinet back of the unit.

This T.V. receiver will not work properly in

foreign countries where the television trans-

mission system and power source differ from

the design specifications.Refer to the specifi-

cation table.

VIDEO

MODE AUDIO

MODE

POWER

▲CH▼

+VOL

RECALL

MENU IMAGE

SLEEP

DISPLAY

MUTE

FXMR

VOL-

Specifications

Power Source . . . . . . . . .AC110V-240V, 50Hz / 60Hz

Receiving System . . . . . .PAL (M/M, N/N), NTSC (M/M)

Channel Coverage

Antenna mode VHF: CH02-CH13, UHF: CH14-CH69

CATV mode VHF band: CH01-CH13, Mid band: CH14-CH22

Super band: CH23-CH36, Hyper band: CH37-CH64

Ultra band: CH65-CH94 and CH100-CH125

Low mid band: CH95-CH99

Video IF . . . . . . . . . . . . .45.75MHz

Aerial Input Impedance . .75Ω

Ext.Terminals

Video inputs: Phono jack ✕2 (1Vp - p, 75Ω)

Audio inputs: Phono jack (R/L) ✕2 (436mVrms, more than 40KΩ)

Headphone Jack: Mini stereo jack ✕1

Sound Output (RMS) . . . .3W + 3W

Speakers . . . . . . . . . . .5cm x 9cm x 2

Dimensions . . . . . . . . .C21LB25S: 606(W) ✕479(H) ✕483(D)mm

C29LK35: 656(W) ✕600(H) ✕496(D)mm

Weight . . . . . . . . . . . . .C21LB25S: approx. 21.0 Kg

C29LK35: approx. 32.0 Kg

Specifications subject to change without notice.

MENU ▼ CH ▲

VOLUME

VIDEO

L-AUDIO-R

MENU ▼ CH ▲

VOLUME

VIDEO

L-AUDIO-R

REFERENCE NO. SM5110159

Contents

-2-

Safety Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Chassis Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

IC Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7

Service Adjustments with replacing Memory IC (IC802) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-17

Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Purity and Convergence Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-21

Chassis Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-35

Safety Notice

SAFETY PRECAUTIONS

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 pro-

vided 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 net-

works 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.

X-RADIATION PRECAUTION

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

structed 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 ser-

vice 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 volt-

age check 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 .

Chassis Block Diagrams

-3-

IC802

MEMORY

24LC04B/P

X' TAL-SW1 (PAL-M)

TUNER

(WITH PLL)

ANT

AC POWER

CIRCUIT

T611

CONVERTER

TRANS.

B1:130V (MAIN HIGH)

B2: 15-18V (AUDIO)

B4: 25V (VERT.)

B5: 12V (MAIN LOW)

FROM IC801(CPU) PIN-37 PAL-M

PAL-N

NTSC

SAW

Filter

IIC BUS CONTROL

OSD

A-L A-R

REAR AV IN

SIF

FILTER

4.5MHz

B6:9V

B7:5V

B8:5V

REG.IC

VERT. -OUT

AUDIO-OUT

SIF IN

VIF/SIF OUT

INT.VIDEO-IN

EXT.VIDEO-IN

SOUND

CARRIER

TRAP

4.5MHz

BQ901

CRT

T401 F.B.T

DEFLECTION

YOKE

Q432

HORIZ.-OUT

HEADPHONE

JACK

SP901

SP902

AUDIO RIGHT

AUDIO LEFT

FRONT AV IN

VIDEO

SDA

SCL

27 28

IC801

CPU

QXXAVB338

X' TAL-SW2 (PAL-N)

BLK

SDA

SCL

A101

X131

SDA

SCL

10 14

6/7

IF IN IC201 QXXAVB488M

IF/VIDEO/CHROMA/DEFLECTION ( 1-CHIP IC )

BLK

272328

30 3436

VERT. OUT

HORIZ. OUT

IC501

LA7841

FROM IC801(CPU) PIN-38

IC651

IC3401

UPC1851BCU

MTS DECODER/AUDIO CONTROL & SW

39 38

26 IC001

LA4600

AUDIO AMP. 3

K1101

VIDEO

A-RA-L

K1001 K1111

MAIN SIGNAL PROCESSING CIRCUIT

Chassis Block Diagrams

-4-

SYSTEM CONTROL

13 KEY SWITCH IN KEY

SWITCH

SCL

SDA

POWER ON/OFF PHOTO COUPLE

(ON=HIGH, OFF=LOW)

IC201

VIDEO / CHROMA

SLAVE ADDRESS

IC801

CPU

QXXAVB338

2728

34 ADJUSTMENT DATA IN

OSD BLK OUT

OSD RED OUT

OSD GREEN OUT

OSD BLUE OUT

DEFLECTION

CIRCUIT

HORIZ. SYNC IN (ACTIVE=LOW)

VERT. SYNC IN (ACTIVE=LOW)

POWER PROTECT IN

(POWER ERROR=LOW) POWER CIRCUIT

etc.

SCL

SDA

IC802

MEMORY

OSC

32.768KHZ CPU OSC OUT

CPU OSC IN

LED ON-TIMER LED OUT (ON=LOW)

RC SIGNAL IN

(ACTIVE=LOW)

RC PRE-AMP.

SOUND MUTE OUT

(ACTIVE=HIGH)

IC001

AUDIO AMP.

A101

TUNER

RESET IN (RESET=LOW) 17

X'TAL-SW1(PAL-M) ON=HIGH

X'TAL-SW2(PAL-N) ON=HIGH

19 VIDEO SIGNAL IN

RELAY OUT FOR DEGAUSSING

(ON=HIGH) 6

STEREO/MONO OPTION

HIGH(OPEN)=MONO, LOW=STEREO

PIP OPTION HIGH(OPEN)=NON, LOW=PIP

IC3401

MTS DECODER

IC Block Diagrams

-5-

IC201 < IF/Video/Chroma/Def. > QXXAVB488

VIF IN

IFAGC OUT AFT

TV IN

EXT IN

AUDIO

OUT

2725242122412819201830239101445

QXXAVB488

SYNC IN

KILLER FILTER

IDENT FILTER

COLOURAPC

AFAMP

4.5/6.0

SIF IOADJ BUS

I/F

DET

LIMITTER

B EXIT

INPUT

R EXIT

INPUT

G EXIT

INPUT

V SYNC

TRIG

SYNC

SEP.

SYSTEM

ELIMINATE

BGP

GENE.

PHASE

CONT

KILLER

DET

LOCK

DET

CHROMA

APC

DET

PAL

SECAM

SELF

ADJ

V.RAMP

AFC

1H DL

VCXO

ACC

DET

F/F

2NDAMP

CHROMA

BPF

1STAMP

(ACC)

HPF

AFT

AFT OUT

VIDEO

MUTE

H STOP

H.PHASE

AUDIO MUTE SW SDA

SCL

FAST BLK

B IN

R IN

B-OUT

R- OUT

G-OUT

G-IN

H-VCC

SECAM REF

V.SIZESERVICE

H-OSC

SELFADJ.

CLAMP

50/60 OUT

TINT

DRIVE

ABCL

ID CUT BLUEBACK

WHITE

BACK

COLOR

CONTRAST

SERVICE BRIGHT

STATION DET STATION

SYSTEM SET

SYSTEM

IFAGC

DELAYADJ

DEFEAT

DLTIME

DLFINE

VIDEO

VCC

VIDEO

GND

DEFLECTION

GND

TRAP

D.TRAP

F.TRAP

BLACK STRECH OFF

FAGC

VIDEO

DET

VIF

AMP

APC

DET

ADJ

DET

BLACK

STRECH

VIDEO

TONE

CHROMA

TRAP

VIDEO

MUTE

CLAMP

SHARPNESS

CONTRAST

DELAY

FEF

FILTER

AGC

R-Y IN

B-Y IN

H OUTPUT

SYSTEM

DECODE

BRIGHT

CHROMA

DEMODULATOR

DR/VE

AMP

AFC GAIN

RGB MATRIX

CONTRAST

32 FH

VCO

MUTE

DET

BLK

VERTICAL

COUNTDOWN

HORIZONTAL

COUNTDOWN

EXITAUDIO

GND

VCC

VIF

SIF

SIF IN

4 6 7 2 9 31 38

V-OUT

V-FB

V RAMP

BLK

AUDIO

DIRECT

OUT

AF DC

HI VCC

IF OUT

IFAPC

IF VCO

BLACK

PEAK ACL/CLK Y-SW

OUT

X TAL 4.43

X TAL 3.58

BLACK PEAK

IC Block Diagrams

-6-

IC501 < Vertical Output > LA7841

THERMAL

PROTECTION PUMP

AMP

GND

Ver. Output

Output

Stage Vcc

Non Inv. Input

Inverting

Input

Vcc

Pump Up

Output

LA7841

123 4 567

IC001 < Audio AMP. > LA4600

Standby SW

Ch1

Input

amplifier

Rf1

Ch1 input

Small signal

GND

Ch2 Input

P.P

REF

amplifier

Rf2

RNf1

RNf2

Ch2

Input

amplifier

Pop noise prevention block

Pre-

drive

amplifier

Pre-

drive

amplifier

Output

amplifier

TSD protector 2

Ch1 output

Large signal

GND

Output

amplifier

Ripple filter

Filter

Standby Vcc

Ch2 output

IC611 < Switching Regulators > QXXAVB325

START O.V.P LATCH

REG.

T.S.D

Iconst

Rconst+ Rconst-

O.S.C

Comp.2

Vth(2)

C1 R1

DRIVE

Comp.1

Vth(1)

3Drain

Terminal

Source

Terminal

Over current/

Feed Back

Terminal

GND

4Power Supply

O.V.P: Overvoltage protection circuit

T.S.D:Thermal shutdown circuit

IC Block Diagrams

-7-

910 11 15 18 14 13 17 16 20

Noise BPF

Noise

Detector I2C Bus

Interface

SAP Demodulation Block

Composite

Signal Input

2.2µF

0.1µF

0.047µF

SAP Signal

Detector

SAP Offset

Absorption

0.47µF0.1 µF

68KΩ

5.1

KΩ

16.6

KΩ

Noise

Detector

23 22

24 46 3

4.7µF

1µF

0.1µF

1KΩ

22µF

1/2Vcc

1µF

34 35 38 36 39 37 41 40

Filter

Control

Stereo

Demodulation

Block fH

LPF fH

Trap

Switch

75µS

De-emphasis Offset

Absorption

dbx Noise

Reduction

Block

Matrix Selector

Block

Surround

Block

Tone Control Block

Volume Control Block

33 32 31

302719

2.2µF

0.1µF 2200pF

+Vcc

10 µF

D/A

2.2µF

0.1µF

2200pF

0.022µF

4.7µF

1 µF

10 µF

3.3 µF

1 µF

KΩ

1 µF

D/A

Input

Attenuator

I2C Bus

Interface D/A

Filter

Power Supply

Reference Voltage

Pilot Detector 1

Pilot Detector 2

Phase

Detector 1

Phase

Detector 2

SAP Signal Output

SAP Signal Input

Spectral Timing Setting

VCA Offset Absorption

Wide-band Timing Setting

Wide-band RMS Setting

Spectral RMS Setting

Variable Emphasis Input

Offset Absorption

Variable Emphasis

Offset Absorption

Analog Ground

Timing Current Setting

SDA

SCL

GND(I2Cbus)

R-channel

Output

L-channel

Output

Surround Timing Setting

R-channel Offset

Absorption

R-channel Capacity of

High Frequency Band Width

R-channel Capacity of

Low Frequency

Band Width

L-channel Offset

Absorption

L-channel Capacity of

High Frequency

Band Width

L-channel Capacity of

Low Frequency

Band Width

External R-channel Input 3

External L-channel Input 3

External R-channel Input 1

External R-channel Input 2

External L-channel Input 1

External L-channel Input 2

L-channel Fixed Output

Monaural Offset Absorption

R-channel Fixed Output

IC3401 < MTS Decoder, Audio Control & Switch> UPC1851BCU

-8-

Service Adjustments with Replacing Memory IC(IC802)

RECALL

Note:The CPU (IC801) and memory IC (IC802) store the service adjustments data and controls data for each circuit.

When the Memory IC(IC802) is replaced, some of the service adjustments should be readjusted to obtain the

best performance. The necessary service adjustments are carried out by using the RC handset. Please set

up the TV set with following steps [1] to [4].

[1] Initializing Procedure

1. Put a new memory IC.

2.Turn on the TV set.

3. Press and hold the MENU button on the TV set, then press 0 button on the remote control transmitter.

The following picture appears on the screen.

This completes the initialization of memory IC.

Following shows the initialized contents of memory data by this procedure.

1.TV/AV mode :TV mode

2. Antenna or cable setting : Antenna

3. Colour system : AUTO

4. Channel Memory : Clear

5. Receiving Channel : Ch02

6. Sound Volume : 11/63 steps

7. Color : 30/63 steps

8. Contrast : 63/63 steps

9. Brightness : 32/63 steps

10. Sharpness : 31/63 steps

11.Tint : 31/63 steps

12. Language : Spanish

13. Password : Clear

14. Channel Block : Clear

15. Sleep Timer : Clear

16. Clock, ON/OFF Timer : Clear

17. Picture Mode : MANUAL

18. Stereo/Mono Setting : Stereo

19. Bass : 31/63 steps

20.Treble : 31/63 steps

21. Balance : 31/63 steps

22.Video status (Picture mode data)

Item NORMAL STRONG SOFT MANUAL

Colour 28 34 22 28

Contrast 63 63 63 63

Brightness 35 15 40 35

-9-

Service Adjustments with Replacing Memory IC(IC802)

Readjust the following service adjustments.

Adjustments Service Mode No. & Item

Horizontal centre adjustment Item 01, H-P

Vertical centre adjustment Item 02, V-P

Vertical size adjustment Item 03, V-S

OSD position adjustment Item 04, OSD

RF AGC adjustment Item 05, AGC

AFT adjustment Item 06, VCO

Grey scale adjustment Item 18-24

Further adjustment please refer to page 11 and 12.

No. Item Initial value Range Description

01 H-P 08 00~15 Horizontal centre adjustment

02 V-P 04 00~07 Vertical centre adjustment

03 V-S 64 00~127 Vertical size adjustment

04 OSD 20 01~63 OSD position adjustment

05 AGC 64 00~127 RF AGC adjustment

06 VCO 128 00~255 VCO (AFT) adjustment

07 SIF 00 00 SIF VCO adjustment

08 SELF 00 00~15 SELF-adjusting

09 DLT 02 00~03 DL-time adjustment

10 DL F 00 00, 01 DL-fine adjustment

11 B

ST 00 00, 01 Black stretch on/off setting

12 ABCL 01 00, 01 ABCL adjustment

13 AB-G 00 00, 01 ABCL gain adjustment

14 TRAP 03 00~03 Trap frequency adjustment

15 WBK 00 00, 01 White back setting

16 BBK 00 00, 01 Blue back setting

17 AFCG 02 00~02 AFC gain adjustment

18 RBI 00 00~255 Red bias adjustment

19 GBI 00 00~255 Green bias adjustment

20 BBI 00 00~255 Blue bias adjustment

21 RD 64 00~127 Red drive adjustment

22 BD 64 00~127 Blue drive adjustment

23 DRV -- -- White balance adjustment

24 -- -- -- Y-cut setting

25 OPT1 -- -- Option

26 OPT2 -- -- Option

27 CCD 20 01~255 Closed Caption position adjustment

Service mode adjustments table in CPU ROM

Grey scale adjustment

Notes:

The initial value that the CPU writes down the CPU ROM data to the memory when replaced the memory IC.TV set

may not operate correctly with this initial value. It is required to set up the fine adjustment for service adjustments

described below.

[2] Service Adjustments-1

Following table shows the initial values which have been stored in the CPU ROM, and items for the service

adjustments.

00010011 00100100

23 DRV R 64 B 64

-10-

Service Adjustments with Replacing Memory IC(IC802)

[Entering to Service Mode]

1. Press and hold the MENU button on the TV set and press the 2 button on the remote control handset. Following

setting items appears on the screen.

Display for [H-P] Horizontal centre adjustment

00010011 00100100

01 H-P 08

Read Status

Item No. Item Data value

Data value for Red

Display for [DRV] White balance adjustment

Read Status

Item No. Item

Data value for Blue

To return to normal TV mode, press the MENU button on the TV set or remote control handset.

2. Select item by pressing the CHANNEL DOWN (Item No. UP) or CHANNEL UP (Item No. DOWN) button on the

remote control handset.

3. Adjust data value by pressing the VOLUME + or VOLUME

button on the remote control handset.

Example

123

▲CH▼

DISPLAY

MUTE

▲CH▼

+VOL

MENU IMAGE

VOL-

01➔02➔03➔04➔05......27

27➔26➔25➔24➔23......01

▲CH▼

+VOL

DISPLAY

MUTE

VOL-

Read Status of

STEREO IC

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