Sanyo CM21SP81A, CM21SP81 User Manual

SERVICE MANUAL Colour Television

Product Code: 111359614 (CM21SP81)

111359634 (CM21SP81A)

Original Version

Chassis Series: AC5-CG

C2ES/C2ESA

FILE NO.

Model No. CM21SP81

CM21SP81A

(Middle East)

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 differ from the design specifications. Refer to the specification table.

Specifications

Power Source . . . . . . . . . AC110-240V, 50Hz/60Hz.

Colour System . . . . . . . . PAL/SECAM/NTSC4.43/NTSC/PAL-60Hz

Television System . . . . . . B/G, D/K, K’, I, M/M

Channel Coverage . . . . . VHF: E2-E12, R1-R12, K1-K9, A2-A13, J1-J12

UHF: 21-69, A14-A69, J13-J62

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 ✕ 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) . . . . 6W

Speaker . . . . . . . . . . . . . 6 cm ✕ 12 cm ✕ 2 pcs.

Dimensions . . . . . 619 (W) ✕ 461 (H) ✕ 485 (D) mm

Weight . . . . . . . . approx. 22.0 Kg

Specifications subject to change without notice.

REFERENCE NO. SM5110579

85236

P▲

P▼

JXMYA

-/--

TV/AV

A B

CH SCAN

TIMER

PIC MODE

SWAP

BASS

SURROUND

Service Ref. No. CM21SP81-00

CM21SP81A-00



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 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.

X-RADIATION PRECAUTION

The primary source of X-RADIATION in 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 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

(MAIN SIGNAL PROCESSING CIRCUIT)

CRT UNIT

LED

D1910

A1901A

RC RECEIVER

KEYS

SW1901 - SW1906

FRONT CONTROL

Q901

180V

KEY-IN

CRT

ON-TIMER

RC-IN

IC801

CPU

L902

HEATER

IC501

SCL

SDA

Q432

VERT. /DEF.

IC802

EEPROM

OSD B-OUT

OSD G-OUT

OSD R-OUT

H-OUT

T431

H-DRIVE

IC201

IF/VIDEO/CHROMA

FOCUS

SCREEN

TRANS.

OSD G-IN

OSD R-IN

5/6

IF IN

Q431

H-DRIVE

R-OUT

OSD B-IN

EXT. VIDEO IN

G-OUT

B-OUT

MATRIX

RGB

VIDEO OUT

INT. VIDEO IN

FBT

T471

SIF OUT

POWER SUPPLY CIRCUIT

VERT. OUT

SIF IN

5VRC

Reg.

T611

CONVERTER

HORIZ. OUT

AUDIO OUT

TRANS.

IC281

AUDIO MONITOR OUT

11V

SECAM

R-Y OUT

SELECTED VIDEO OUT

24V

B-Y OUT

130V

VR631

SWITCH

VIDEO IN

EXT. AUDIO IN

X161

SAW

FILTER

A101

TUNER

REAR

AV TERMINAL

VIDEO IN

AUDIO IN

FRONT

AV TERMINAL

VIDEO IN

IC001

AUDIO OUT

SP902

AUDIO MONITOR OUT

VIDEO MONITOR OUT

REAR

TERMINAL

AUDIO AMP.

AUDI O I N

SP901

-4-

Chassis Block Diagrams

SYSTEM CONTROL

BASS EXPANDER CIRCUIT

A101

F/S TUNER

SDA

SCL

CIRCUIT

DEFLECTION

IC201

etc.

KEY

SWITCH

BASS EXPANDER ON/OFF (ON=HIGH)

COLOUR SYSTEM OPTION INPUT

KEY SWITCH IN

CPU

IC801

QXXAVC305P

SCL

POWER ON/OFF

SDA

IF/VIDEO / CHROMA/DEF.

PHOTO COUPLE

AFT SIGNAL INPUT

(ON=HIGH, OFF=LOW)

OSD GREEN OUT(Active=High)

OSD RED OUT(Active=High)

OSD BLK OUT(Active=High)

OSD BLUE OUT(Active=High)

211817

POWER CIRCUIT

HORIZ. SYNC IN (ACTIVE=LOW)

VERT. SYNC IN (ACTIVE=LOW)

(POWER ERROR=LOW)

POWER PROTECT IN

SDA

SCL

IC802

MEMORY

SOUND MUTE

(MUTE=H)

IC001

AUDIO AMP.

RESET INPUT (RESET=LOW)

SECAM KILLER INPUT (HIGH=SECAM)

(ON TIMER ON=Low)

RC SIGNAL IN

(ACTIVE=HIGH)

ON-TIMER LED OUT

VIF-M OUTPUT (HIGH=NTSC, LOW=OTHER)

RC PRE-AMP.

LED

CPU OSC OUT

CPU OSC IN

OSC

X801

32.768KHz

-5-

IC Block Diagrams

IC201 < IF/Video/Chroma/Def. > LA76818A

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 AFC Filter

Horizontal Output

VOL

AGC

VCC 5V

BUS

ABL

CLAMP

VCC

19 20

DRIVE/OUT-OFF

SYNC SW

VCC

FSC/

RAMP

VER

HOR

VCC

HOR

OUT

26 27

AGC

VIF

CONTRAST

BRIGHT

OSD

VER

C/D

SHIFTER

PHASE

VER

SEP

AFC2

DET

PEAKING

CORING

STRETCH

BLACK

REST

CONTRAST

BRIGHT

MATRIX

RGB

SEP

AFC1

DET

DELAY

LINE

SYNC

AMP

VIDEO

AFT

ACC

DEMO

COLOR

CLAMP

HOR

C/D

LIM

TRAP

BPF

TRAP

ON/OFF

BPF

PA L

CLAMP

ALC

LPF

1/256

IDENT

VIDEO

APC1

TINT

VCO

HOR

VCO

SPLL

VIDEO

AMP

DC ADS.

1H DELAY

VXO

DDS

APC2

BPF

A2C

PLL

CLMP

CLAMP

FBP

SIF Input

SIF APC Filter

525354

SIF Output

Ext. Audio Input

APC Filter

4950

VCO Coil 1

VCO Coil 2

VCO Filter

Video Output

Black Level Detector

4445

Internal Video Input (S-C IN)

V/C VCC

Video/Vertical Vcc

External Video Input(Y-IN)

Video/Vertical/BUS Ground

Selected Video Output

Chroma APC1 Filter

4.43 MHz Crystal

Clamp Filter

Chroma APC2 Filter

353637

SECAM R-Y Input (Cr Input)

SECAM B-Y Input (Cb Input)

CCD/Horizontal Ground

CCD Filter

VCC

CCD Vcc

Clock (4MHz) Outupt

VCO IREF

2829

Flyback Pulse Input

IC Block Diagrams

-6-

IC201 <IF System Block Diagram> LA76818A

SIF

1000p

APC

Filter

10p

0.01u

SIF.In

SIF.Out

LIM

500K

1bit

Deem-TC

1bit

FM Gain

Det

AMP

BPF

500K

Det

Amp

BPF

Sound

Det

Snd

Out

De-

Amp

emph

FM.Level

SIF

VCO

0.01u

5bit

pre-

SIF. Sys

scaller

2bit

Filter

1 bit

FM Mute

2.5V

Chroma

Det

APC

OSC

C/D

Video

Out

Video

Amp

Sound

Det

Tr ap

Audio in

BUS

Ident

B/N

INV

Video.Level

10u

3bit

Audio.out

(ATT)

VOLUME

Input

Select

1bit

A.Fil.Def

Filter

VOLUME

1bit

A.SW

VCO

Chroma

7bit

VOLUME

D/A

VOLUME

1bit

A.MUTE

Buzz

Canceller

0.1u

Vcc

Detector

2bit

VIF.Sys

Pulse

Chroma

VIF

BUS

AFT

100K

AFT

Counter

VCO

PLL Pull-in SW

Det

APC

VCO

COIL2

VCO

COIL1

APC

Filter

330

VCO.Coil

0.47u

VCO

Filter

0.47u

VCO

Alignment

Phase

VCO

Ident

VIF

Reset

Counter

Det

Lock

-π/4

+π/4

Clock

Data

AGC

VIF 3

to BUS Line

VIF 2

BUS

Interface

VIF AMP

In1

PIF

IF In

VIF 1

SAW

PIF

IF AGC

In2

AGC

2ndIF

Def

1bit

Drive

AGC

RF AGC

30K

120K

Out

RF AGC

IF AGC

6bit

Delay

IF VCC

BUS

(6 Vcc)/7

GND

PIF

AGC

0.022u

-7-

IC Block Diagrams

IC501 < Vertical Output > LA78040/N

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

Thermal

Protection

AMP

Pump

INVERTING

INPUT

Vcc

GND

PUMP UP

OUT

OUTPUT

Ver. OUTPUT

NON INV.

STAGE Vcc

INPUT

-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

[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.

TV/AV

Service Adjustments with Replacing Memory IC(IC802)

-9-

DATA INITIAL

No. ITEM RANGE SETUP DESCRIPTION

DATA

01 RFAGC 0~63 31 RF AGC Adj.

02 H-PHA 0~31 9 H-Phase (H-Centering) Adj. (50Hz)

03 V-POS 0~63 40

V-Position (V-Centering) Adj. (50Hz)Fixed.

04 V-SIZ 0~127 78 V-Size Adj. (50Hz)

05 V-SCO 0~31 10 V-S Correction (50Hz)

06 V-LIN 0~31 20 V-Linearity Adj. (50Hz)

07 H-P60

-16~+15

+5 H-PHASE Adj. (60Hz)

08 V-S60 -

64~+32

0 V-Size Adj. (60Hz)

09 OSDHP 0~255 26 OSD H-Position Adj.

10 OSDC 0~127 45 OSD Contrast Adj.

11 V-SCP 0~7 7 Correction of the V-size

accompanying brightness change.

12 H-SCP 0~7 7 Correction of the H-size

accompanying brightness change.

13 SBIAS 0~127 105 Sub Bias Adj. (Do not change)

14 RBIAS 0~255 0 Red Bias Adj.

15 GBIAS 0~255 0 Green Bias Adj.

16 BBIAS 0~255 0 Blue Bias Adj.

17 RDRIV 0~127 64 Red Drive Adj.

18 GDRIV 0~15 8 Green Drive Adj.

19 BDRIV 00~127 64 Blue Drive Adj.

20 1-LINE APPEAR White Balance Adj.

21 DRV White Balance Adj.

22 B-YD 0~15 8 B-Y DC level Adj.

23 R-YD 0~15 8 R-Y DC level Adj.

24 B-YDN -

16~+15

0 NTSC B-Y DC level Adj.

25 R-YDN -

16~+15

0 NTSC R-Y DC level Adj.

26 SBDC -

16~+15

−6 SECAM B-Y DC level Adj.

27 SRDC -

16~+15

−2 SECAM R-Y DC level Adj.

28 G-YA 0,1 0 G-Y angle Adj.

29 RBGB 0~15 8

R-Y, B-Y Gain Blance Adj. (Do not change.)

30 RBAG 0~15 8

R-Y, B-Y Angle Adj. (Do not change.)

31 G-YAN 0,1 0 NTSC G-Y Angle Adj.

32 RBGBN -

16~+15

0 NTSC R-Y, B-Y Gain Balance Adj.

33 RBAGN -

16~+15

0 NTSC G-Y, B-Y Angle Adj.

34 COGV 0~3 0 Coring Gain Adj.

35 BLKS 0~3 3 Setting of Black stretch start.

36 BLKG 0~3 3 Setting of Black stretch gain.

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

38 BRST 0,1 0 Setting of ABL.

39 BRTH 0~7 0 Setting of ABL.

40 WPL 0~3 2 White peak limitter.

41 YGAM 0~3 0 Y Gamma setting.

42 PORW 0,1 0 Switching of Pre-shoot and

Over shoot in AV mode.

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

DATA INITIAL

No. ITEM RANGE SETUP SCRIPTION

DATA

43 PORS 0~3 2

Pre-shoot/Over shoot Adj. in AV mode.

44 RFCO 0~3 0 RF Coring Gain Adj.

45 PORWN 0,1 0

Switching of RF Pre-shoot and Over shoot.

46 PORSN 0~3 0 RF Pre-shoot/Over shoot Adj.

47 TINT -16~+15 0 RF Tint Adj.

48 TINT443 -16~+15 -12 NTSC 4.43 Tint Adj.

49 SHRF -32~+31 0 RF Sharpness Adj.

50 TEXTC

128~+127

0 OSD TEXT Contrast.

51 VOLUM 0~255 127 Volume Control Adj.

52 DEEM 0~1 0 De emphasis TC.

53 VIFSW 0~3 0 VIF System Switch.

54 SIFSW 0~3 1 SIF System Switch.

55 V-LVL 0~7 4 Video Level Adj.

56 FMLVL 0~31 16 FM Level Adj.

57 IFOM-S 0,1 0 Over Modulation Switch

58 IFMN-S 0,1 1 Audio Monitor Switch

IFTRAPS

0,1 1 SIF Trap Switch ON/OFF

60 IFMLVL 0~255 136 Video Level & Modulation

61 TRAP-T 0~7 4 Trap Test

62 H-FRQ 0~63 34 Horizontal Frequency

63 FBTS 0,1 0 FBT Blanking Switch

64 COOP 0~7 7 Color Killer Option

65 HBLKL 0~7 7 H-Blanking Control. (Left)

66 HBLKR 0~7 3 H-Blanking Control. (Right)

67 AFCRF 0,1 0 RF AFC gain & Gate Adj.

68 VSRF 0,1 0 RF Vert. Sync. Separation Adj.

69 CDMRF 0~7 0 RF Vert. Count-Down Circuit Adj.

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

71 VSUAV 0,1 0 AV Vert Sync. Separation Adj.

72 CDMAV 0~7 0 AV Vert Count-Down Circuit Adj.

73 HLVDRF 0,1 1 H Lock, V Detect RF

74 HLVDAV 0,1 1 H Lock, V Detect AV

VCO-SW

0,1 0 C-VCO Adj. Switch

VCO-ADJ

0~3 3 C-VCO Adj.

CROSS-BW

0~3 0 Output Pattern Picture

AVNCON

0~127 64 AV Blue Back Signal Contrast

79 AVNBRI 0~127 64 AV Blue Back Signal Brightness

80 POMT 0~127 25 Power Mute Time Adj.

81 CHMT 0~31 10 Channel Change Mute time Agj.

82 SYST 0~15 5

The number of times that a colour system AUTO is judged.

83 S-STE 0~3 0 Stereo/Mono Option. 0=MONO,

1=SIMPLE AV STEREO, 2,3=AV STEREO

84 VOLTBL 0~1 1 Volume Table

85 MPP 0,1 0

Multi Personal Preference function on/off

o=without M.P.P., 1=with M.P.P.

( /JE0090B)

+ 21 hidden pages