Sanyo CR21KX2 Manuel utilisateur

VIDEOL-AUDIO-R

TV/AVMENU

SERVICE MANUAL Colour Television

Specifications

Power Source . . . . . . . . . AC220-240V, 50Hz/60Hz.

Colour System . . . . . . . . PAL (AV input : PAL/NTSC4.43/NTSC/PAL-60Hz)

Television System . . . . . . B/G

Channel Coverage . . . . . VHF: E2-E12

UHF: 21-69

CATV: S1-S41, X, Y, Z, Z+1, Z+2

Video IF . . . . . . . . . . . . . . 38.0MHz

Aerial Input Impedance . . 75Ω

Ext. Terminals

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

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

Video monitor outputs: Phono jack ✕1(1Vp - p, 75Ω)

Audio monitor outputs: Phono jack ✕1(436mVrms, less than 600Ω)

Sound Output (RMS) . . . . 5W + 5W

Dimensions . . . . . . . . . 625 (W) ✕460.5 (H) ✕ 483.8(D)mm

Weight . . . . . . . . . . . . . . . approx. 21.5 Kg

Specifications subject to change without notice.

Product Code:111358204

Original Version

Chassis Series: AC5-A

C4VE

FILE NO.

Model No. CR21KX2

Service Ref. No. CR21KX2-00

(Singapore)

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

transmission system and power source dif-

fer from the design specifications. Refer to

the specification table.

REFERENCE NO. SM5110396

P▲

P▼

JXMYA

-/--

TV/AV

A B

CH SCAN

TIMER

MENU PIC MODE

SWAP

BASS

SURROUND

Contents

-2-

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

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

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

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Service Adjustments with replacing Memory IC (IC802) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-11

Service Mode Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-13

Service Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Special Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Purity and Convergence Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Cabinet Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Chassis Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-25

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 .

-3-

Chassis Block Diagrams

Front

key

A1901A

PRE-AMP.

D1910

LED

5V-2

ANT

VIDEO IN

L-IN(AUDIO)

R-IN(AUDIO)

AUDIO MONITOR OUT

FRONT

AV IN

REAR

AV IN

VIDEO IN

IC802

MEMORY

SCL SDA

Key in

R/C in

VIF

31 29 33 30

Stand by

Mute

Mono/St.

Vol.

Protect

27 10

AFT

BLK

36V

11 IF OUT

CPU

VIF

RF AGC

A101

TUNER

X161

SAW Filter

R-IN

R-OUT

MONO/ST.

IC1201

AUDIO SW

15V

SELECTED VIDEO OUT

AUDIO-OUT

Ext.AUDIO-IN

Ext.VIDEO-IN

RF AGC

AFC

ABL

28 13

IF in

AFT

SIF

out

SIF

VCC

VIDEO

VERT

VCC

RGB

VCC

HOR.

VCC

5V-2

54 8 43

18 25

H-VCC

9V-1

85VRC

BLK

VIDEO-OUT

INT. VIDEO IN

R-OUT

G-OUT

B-OUT

H-OUT

V-OUT

IC201

IF/VIDEO/

CHROMA

MUTE

VOL.

L-IN

R-IN

Rout

Lout

IC001

AUDIO AMP.

180V

IC501

VERT./DEF.

SWITCH

VR631 130V Reg.

Reg.

24V

15V

5VRC

Reg.

24V

Protect

T431

H-DRIVE

TRANS.

Q432

H-OUT

25V

130V

L902

AFC ABL

T471

FBT

Q901

CRT

Heater

180V

Heater

Low B

36V

H-VCC

9V-1

5V-2

Protect

POWER SUPPLY CIRCUIT

Protect

4/5

IC801

SP901

(L)

SP902

(R)

REAR

MONITOR

OUT

VIDEO MONITOR OUT

L-IN(AUDIO)

R-IN(AUDIO)

11/12

Q431

H-DRIVE

CRT UNIT

T611

CONVERTER

TRANS.

AUDIO MONITOR OUT

IIC Bus

MAIN SIGNAL PROCESSING CIRCUIT

-4-

Chassis Block Diagrams

SYSTEM CONTROL

BASS EXPANDER ON/OFF (ON=HIGH) BASS EXPANDER CIRCUIT

COLOUR SYSTEM OPTION INPUT

KEY SWITCH IN KEY

SWITCH

TV/AV SWITCH

(TV=LOW, AV=HIGH) SCL

SDA

POWER ON/OFF

PHOTO COUPLE

(ON=HIGH, OFF=LOW)

IC201

IF/VIDEO / CHROMA/DEF.

IC801

CPU

QXXABV864

OSD BLK OUT(Active=High)

OSD RED OUT(Active=High)

OSD GREEN OUT(Active=High)

OSD BLUE OUT(Active=High)

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

X801

32.768KHz CPU OSC OUT

CPU OSC IN

LED

ON-TIMER LED OUT (ON TIMER ON=Low)

RC SIGNAL IN

(ACTIVE=HIGH)

RC PRE-AMP.

SOUND VOLUME OUT

(ACTIVE=LOW)

IC001

AUDIO AMP.

VIF-M OUTPUT (HIGH=NTSC3.58, LOW=OTHER)

A101

F/S TUNER

AFT SIGNAL INPUT

RESET INPUT (ACTIVE=LOW)

MUTE OUTPUT

(MUTE ON=HIGH) 29

MONO/STEREO

IC1201

AUDIO SWITCH

SECAM KILLER INPUT (HIGH=SECAM)

IC2001

TELETEXT

*Not equipped

-5-

IC Block Diagrams

IC201 < IF/Video/Chroma/Def. > LA76818

VOL

DET

23456

AGC

VIF

8910

VCC 5V

11 12 13

BUS

PEAKING

CORING

BLACK

STRETCH

SYNC

SEP

14 15

ABL

REST

CLAMP

OSD

CONTRAST

BRIGHT

16 17 18 19 20

CONTRAST

BRIGHT

RGB

MATRIX

OSD

DRIVE/OUT-OFF

VCC

21 22 23

FSC/

SYNC SW

24 25 26 27

VER

RAMP HOR

VCC

VER

C/D

HOR

OUT

PHASE

SHIFTER

AFC2

AFC1

VER

SEP

HOR

C/D

1/256

COLOR

CLAMP

LPF

ALC

CLAMP

DEMO

PAL

ACC

BPF

ON/OFF

DELAY

LINE

TRAP

AFT

VIDEO

DET

TRAP

LIM

AMP

BPF

SPLL

BPF

VIDEO

AMP

IDENT VIDEO

SW APC1 TINT

VXO DDS APC2

DC ADS.

CLAMP

VCO

1H DELAY

HOR

VCO

FBP

2829

VCC

353637

CLMP

4445

CLMP

V/C VCC

4950

A2C

PLL

525354

Audio Output

FM Output/Selected

Audio Output

PIF AGC

RF AGC Output

PIF Input1

PIF Input 2

IF Ground

IF Vcc

FM Filter

AFT Output

Bus Data

Bus Clock

ABL

Red Input

Green Input

Blue Input

Fast Blanking Input

RGB Vcc

Red Output

Green Output

Blue Output

fsc output or C

Sync output

Vertical Output

Ramp ALC Filter

Horizontal/BUS Vcc

Horizontal Output

Horizontal AFC Filter

Flyback Pulse Input

VCO IREF

Clock (4MHz) Outupt

CCD Vcc

CCD Filter

CCD/Horizontal Ground

SECAM B-Y Input

(Cb Input)

SECAM R-Y Input

(Cr Input)

Chroma APC2 Filter

Clamp Filter

4.43 MHz Crystal

Chroma APC1 Filter

Selected Video Output

Video/Vertical/BUS Ground

External Video Input(Y-IN)

Video/Vertical Vcc

Internal Video Input (S-C IN)

Black Level Detector

Video Output

VCO Filter

VCO Coil 2

VCO Coil 1

APC Filter

Ext. Audio Input

SIF Output

SIF APC Filter

SIF Input

IC Block Diagrams

-6-

IC201 <IF System Block Diagram> LA76818

11 12

BUS

Interface

SAW

PIF

In1

PIF

In2

IF In

30K

RF AGC

Out

120K

IF VCC

GND

VIF AMP

VIF 1 VIF 2 VIF 3

IF AGC

Drive

AGC

2ndIF

AGC

RF AGC

Delay

6bit

IF AGC

Def

1bit

(6 Vcc)/7

BUS

0.022u PIF

AGC

Data Clock

APC

Det

+π/4

-π/4

Snd

Det

Amp

SIF.Out

Sound

Trap

Video

Det

Buzz

Canceller

APC

Filter

330

0.47u +

PLL Pull-in SW

BUS

Lock

Det

Video.Level

3bit

Amp

10p

SIF.In

Sound

BPF

VCO.Coil

VCO

COIL1

VCO

COIL2

48 49

VIF

VCO

Chroma

Counter

B/N

INV

Ident

OSC

C/D

Amp

SIF. Sys

2bit

pre-

scaller

SIF

VCO

500K

BPF

SIF

APC

Filter

0.01u 1000p

LIM

AMP

Det

FM.Level

5bit

Chroma

C/D

APC

Det

500K

Det

BUS

Chroma

VCO

VIF

Counter

Reset

Pulse

VCO

Ident

VIF.Sys

2bit

Phase

Detector

A.MUTE

1bit

VOLUME

D/A

VOLUME

Filter

A.SW

1bit

Input

Select VOLUME

(ATT)

2.5V

Amp

FM Gain

1bit Deem-TC

1bit

De-

emph

FM Mute

1 bit

A.Fil.Def

1bit

VOLUME

7bit

VCO

Alignment

AFT 10 AFT

Vcc

100K

0.1u

VCO

Filter

0.47u

Audio.out

Audio in

10u

Video

Out

Filter

Out

0.01u

to BUS Line

-7-

IC Block Diagrams

IC501 < Vertical Output > LA78040/TDA9302H

Thermal

Protection

AMP

Pump

INVERTING

INPUT

Vcc

PUMP UP

OUT

GND

Ver. OUTPUT

OUTPUT

STAGE Vcc

NON INV.

INPUT

IC001 < Audio AMP.> AN5274

Volume

Ripple

Filter

Over

Current

Thermal

Protection

Circuit

12345678910

11 12

Mute Control

Ch.1 Input

Volume Control

Ripple Rejection

Ch.2 Input

Ripple Filter

Ch.2 Output

Negative

Feedback Ch.2

GND

Vcc

Negative

Feedback Ch.1

Ch.1 Output

Service Information

This TV set has a built-in power supply protection circuit.

It is provided to protect the TV set in case of a power supply circuit malfunctions. When something abnormality

occurs during TV reception, the TV set goes to the stand-by mode.

When an abnormality occurs during TV reception, it causes pin 27 of the CPU to go continually Low(less than

0.75V) for about one second. The CPU detects that this has occurred and outputs the signal from pin 31 to

switch off the power supply lines.

Releasing the protective circuit and restoring power supply

To release the protective circuit and restore power supply, turn the power to the TV set OFF and then ON again

via either the main power switch or the ON-OFF button on the remote control. This will work only if the power

supply trouble was temporary. If there is permanent trouble such as a damaged circuit, power cannot be

restored and the circuit will have to be repaired.

■Protection Circuit

-8-

Service Adjustments with Replacing Memory IC(IC802)

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 [2].

[1] Initializing Procedure

1. Put a new memory IC.

2. Turn on the TV set.

3. Press and hold the TV/AV Selector on the TV set for more than 2 seconds. The following picture appears on the

screen.

4. Press the PROGRAMME UP on the TV set while the above On-Screen Display is still on the screen. 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.

- Plug & play : No executed

- Inhibit data : Cancelled

- Ch skip data : Cancelled

- Sound volume data : 10/63 steps.

- Volume Lock : OFF

- Tuning Lock : OFF

- Colour system : AUTO

CLR

Press and hold for more than 2 seconds

TV/AV

-9-

Service Adjustments with Replacing Memory IC(IC802)

[2] Required Service Adjustments

Readjust the following service adjustments.

Adjustments Service Mode No. & Item

RF AGC Item 01, RF AGC

Horizontal centre Item 02, H-PHA

Vertical size Item 04, V-SIZ

Vertical-S correction Item 05, V-SCO

Vertical linearity Item 06, V-LIN

Gray scale Item 14-17, 19-21

Further adjustment please refer to page 12 and 13.

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

Service mode adjustments table in CPU ROM

NO. ITEM DATA

RANGE INITIAL

DATA DESCRIPTION

RF AGC Adj.RF AGC 00~63 30

H-Phase (H-Centering) Adj. (50Hz)H-PHA 00~31 5

V-Position (V-Centering) Adj. (50Hz) Fixed.V-POS 00~63 40

V-Size Adj. (50Hz)V-SIZ 00~127 69

V-S Correction (50Hz)

V-SCO 00~31 15

V-Linearity Adj. (50Hz)

V-LIN 00~31 19

H-Centering Adj. (60Hz)H-P60 -80~+70 +5

V-Size Adj. (60Hz)

V-S60 -32~+31 0

OSD H-Position Adj.

OSDHP 00~255 29

OSD Contrast Adj.OSDC 00~127 45

Correction of the V-size accompanying brightness change.V-SCP 00~07 7

Correction of the H-size accompanying brightness change.H-SCP 00~07 7

Sub Bias Adj.SBIAS 00~127 105

Red Bias Adj.RBIAS 00~255 0

Green Bias Adj.GBIAS 00~255 0

Blue Bias Adj.BBIAS 00~255 0

Red Drive Adj.RDRIV 00~127 64

Green Drive Adj.GDRIV 00~15 8

Blue Drive Adj.BDRIV 00~127 64

1-LINE APPEAR

21 DRV White Balance Adj.

22 B-YD 00~15 10 B-Y DC level Adj.. Colour compensation (PAL)

23 R-YD 00~15 10 R-Y DC level Adj.. Colour compensation (PAL)

24 B-YDN -08~+07 0NTSC B-Y DC level Adj. (Difference value over PAL.)

25 R-YDN -08~+07 0NTSC R-Y DC level Adj. (Difference value over PAL.)

26 SBDC -08~+07 -8 SECAM B-Y DC level Adj. (Difference value over PAL.)

27 SRDC -08~+07 -5 SECAM R-Y DC level Adj. (Difference value over PAL.)

28 G-YA 0,1 0G-Y angle Adj. (The reproducibility of a colour is changed.)

29 RBGB 00~15 8 R-Y, B-Y Gain Blance Adj. (Do not change.)

30 RBAG 00~15 8R-Y, B-Y Angle Adj. (Do not change.)

31 G-YAN 0,1 0NTSC G-Y Angle Adj. (Difference value over PAL.)

32 RBGBN -08~+07 0 NTSC R-Y, B-Y Gain Balance Adj. (Difference value over PAL.)

33 RBAGN -08~+07 0NTSC G-Y, B-Y Angle Adj. (Difference value over PAL)

34 COGV 00~03 0Coring Adj.

35 BLKS 00~03 3 Setting of Black stretch start.

36 BLKG 00~03 3Setting of Black stretch gain.

37 BRTA 0,1 0 On and off of ABL.

38 BRST 0,1 0Setting of ABL.

39 BRTH 00~07 0Setting of ABL.

(Do not change)

White peak limitter.WPL 00~03 2

Y Gamma setting.YGAM 00~03 0

Switching of Pre-shoot and Over shoot in AV mode.

PORW 0,1 0

Pre-shoot/Over shoot Adj. in AV mode.PORS 00~03 2

RF Coring Gain Adj.

RFCO 00~03 0

-10-

Service Adjustments with Replacing Memory IC(IC802)

NO. ITEM DATA

RANGE

INITIAL

DATA DESCRIPTION

Switching of RF Pre-shoot and Over shoot.

PORWN 0,1 0

RF Pre-shoot/Over shoot Adj.

PORSN 00~03 0

RF Tint Adj.

TINT -16~+15 0

NTSC 4.43 Tint Adj.

TINT 443 -16~+15 -12

RF Sharpness Adj.SHRF -32~+31 0

OSD TEXT Contrast.TEXTC -128~+127 0

Volume Control Adj.VOLUM 00~255 127

De emphasis TC.DEEM 0,1 0

VIF System Switch.VIFSW 00~03 0

SIF System Switch.SIFSW 00~03 1

Video Level Adj.V-LVL 00~07 4

FM Level Adj.FMLVL 00~31 16

IF Test.IF-TE 0,1 0

IF Test-1.IF-T1 0,1 1

IF-T2

60 IF-T3 IF Test-3

61 H-FRQ 00~63 34 Correction of Horizontal Frequency.

62 FBTS 0,1 0Switching of H-blanking and Flyback Pulse.

63 COOP 00~07 7Setting of Colour Killer Level.

64 HBLKL 00~07 7H-Blanking Control. (Left)

65 HBLKR 00~07 3 H-Blanking Control. (Right)

66 AFCRF 0,1 0RF AFC Gain & Gate Adj.

67 VSURF 0,1 0RF V-Sync. Separation Adj.

68 CDMRF 00~07 0 RF V-Countdown Circuit Adj.

69 AFCAV 0,1 1AV AFC Gain & Gate Adj.

70 VSUAV 0,1 0AV V-Sync. Separation Adj.

71 CDMAV 00~07 0 AV V-Countdown Circuit Adj.

72 HLVDRF 0,1 1

Incorrect operation prevention at the time of a special signal (RF mode)

73 HLVDAV 0,1 1

Incorrecr operation prevention at the time of a special signal (AV mode)

74 VCO-SW 0,1 0 C-VCO Adj. Switch.

75 VCO-ADJ 00~03 3C-VCO Adj.

76 CROSS-BW 00~03 0Pattern Output.

77 AVNCON 00~127 64 Contrast Adj. of the blue back in AV mode.

78 AVNBRI 00~127 64 Brightness Adj. of the blue back in AV mode.

0,1 1IF Test-2

00~255 136

79 POMT 00~255 25 Power Mute Time Adj.

80 CHMT 00~255 10 Channel Change Mute time Agj.

81 SYST 00~15 5Selection of the number of times of a Colour system judgment.

82 S-STE 0,1 1Stereo/Mono Option. Stereo=1, Mono=0

83 VOLTBL 00~03 0Selection of the change characteristic of volume.

84 CHIP818 0,1 0

Option of 818(1:TINT Control reversal)/828(2:TINT through control) selection.

300 R00 00~255 112 CPU Debug Date.

371 R71 00~255 0CPU Debug Date.

372 R72 00~255 177 CPU Debug Date.

311 R11 00~255 0CPU Debug Date.

310 R10 00~255 68 CPU Debug Date.

309 R09 00~255 112 CPU Debug Date.

308 R08 00~255 33 CPU Debug Date.

301 R01 00~255 64 CPU Debug Date.

302 R02 00~255 0CPU Debug Date.

303 R03 00~255 0CPU Debug Date.

304 R04 00~255 1CPU Debug Date.

305 R05 00~255 0CPU Debug Date.

306 R06 00~255 0CPU Debug Date.

307 R07 00~255 0CPU Debug Date.

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 in the above.

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