Sanyo CP25ST2T Manuel utilisateur

IFILE NO. I

SERVICE MANUAL Colour Television Model No. CP25ST2T

(New Zealand)

Service Ref.No. CP25ST2T_

—

Specifications

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

Colour System ........PAL

(AV Input: PAIJNTSC/NTSC4.43)

Television System ......B/G

Channel Coverage ....VHF: 1-11

UHF: 21-69

CATV S1-S41 ,X, Y, Z, Z+l ,Z+2

Video IF .38.9MHz

Sound lF”:I:: jjjjj; j.33.4MHz

Aerial Input Impedance ..75Q

Ext. Terminals

Video inputs: Phono jack X3(1 Vp -p, 75!2)

Audio inputs: Phono jack (R/L) X3(436mVrms, more than 40KQ)

Video monitor outputs: Phono jack X1(1Vp -p, 75Q)

Audio monitor outputs: Phono jack(tUL) x1(436mVrms, less than 600Q)

Headphone jack Mini stereo jack X1

Sound Output .........7.5W+7.5W

Dimensions ..........691(W) x528(H) x448(D)mm

Weight ..............approx.27.6 Kg

Product Code: 111338719

Original Version

Chassis Series: AC2-A

IGive 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.

Specifications subject to change without notice.

wF2EZ REFERENCE NO. SM510249

Contents

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

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

lC Block Diagrams ..................................................................5-7

Service Adjustments Location ...........................................................8

Service Adjustments with replacing Memory IC(IC802) .....................................9-11

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

Special Functions .................................................................14-17

Purity and Convergence Adjustment .....................................................18

Cabinet Parts List ...................................................................19

Chassis Electrical Parts List.... .....................................................20-30

Safety Notice

SAFETY PRECAUTIONS

l: An isolation transformer should reconnected in the 3: When replacing achassis inthe cabinet, alwaysbe

power line between the receiver and the AC line certain that all the protective devices are installed

when aservice is performed on the primary of the properly, such as, control knobs, adjustment covers

converter transformer of the set. or shields, barriers, isolation resistor-capacitor net-

works etc.. Before returning any television to the

2: Comply with all caution and safety-related notes pro- customer, the service technician must be sure that

videdon the cabinet back, inside the cabinet, onthe it is completely safe to operate without danger of

chassis orthe picture tube. electrical shock.

X-RADIATION PRECAUTION

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

structedto limit X-RADIATION emissions. Forcontinued X-RADIATION protection, the replacement tube mustbe

thesame typeas the original including suffix letter. Excessive high voltage may produce potentially hazardous

-RADIATION.TO avoid such hazards, the high voltage must be maintained within specified limit. Refer tothisser-

vice manual, high voltage adjustment for specific high voltage limit. lf high voltage exceeds specified limits, take

necessary corrective action.Carefully followthe instructions for+Bl voltpowersupply adjustment, and high volt-

age check to maintain the high voltage within the specified limits.

PRODUCT SAFETY NOTICE

Product safety should be considered when acomponent replacement is made in any area of areceiver.

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 ~.

-2-

.,.,,.,..,

IC801

CPU ~R

(

TELETEXT BOARD

Lrl ICI 200

4AV SW.

[

AV1 L1

[

AV2 L2

[

FV3

F:v”; FL3

FR3

[

AV :

0“’ Ro

Icool

A<U&l:2~o~T

57 R

Speakers

Hssdphonss

*-4= IC515

,------------------------------------ ---------

1POWER SUPPLY CIRCUIT

IIC&4 G652 -

1: : 1~fi

0653

AVS

Circuit

M-l-B (X83 b

III

5V ;

12V ;

9V ;

25V :

140V :

24V :

h====

-J-Tun SOUND MUTE

ON-TIMER LED

TV(L)/AV (H)

AVI (L)/AV2(H)

SIF4.5M Sw

SIF 5.5M SW

SIF 6.5M SW

WOOFER ON/OFF

3D SURROUND ONIOFF

3D STEREO ON/OFF

POWER ON(H)/OFF(L)

OPTION SW (POSITION)

Osc

CSOI ;

CPU 33

3.58M SW

50160Hz SW

ACK

STATUS

SCL --i

~- .. . .. .. . .. .. .. ..

key switches

option SW.

IPROTECT

. . ->...wH”wm r...,r.-,<,.m.. =<..,. >--=., -.-.,.—-.— —.

(((

?j.

ABCL X

. .

G’

sDLTIME i

.DELAY DLFINE ;

~TRAP :

D.TRAP ow:

~,mw CHROMA ....-*

HCHROMA

i--- ~pF

1’

HPF

ICxo I

d1-

BGP

GENE.

-----+1

+IIN

—VERTICAL

COUNTDOWN

1+ +AFC GAIN

IAFC

11111

HIILH.PHASE

—SDA

—SCL

—FAST BLK

—BIN

—RIN v

-G

—G

—SECAM REF

LA7841 eVertical Output >

LA4270 cSound Output >

EiEEhi@

LA7841

I2345,6 7

LA4270 300 1

,,* CH1 I

Thermal

Shutdown

Over

7{?

Voltage

Ri ple +

Fi//er CH2

30K

Vcc

ATfl I

STR81 145A <Double Rectifier>

>1Al

rl 22

,~Q1 Q3 *‘

r2 r3 II

iSTR811 45P

Pin Function

1Delay

Gate

Common

---

MM1369 e3D Surround Processor >

Vcc Lin Gll G12 G13 G14 Fc Qf 1Qf2 Qf3 Qf4 LI

24 123 22 121 120 ]19 118 17 16 15 14

gm 1

CIMI IIATFl_l I 1 r-

M369AD IVIRTUAL AUDIO \-

Mfi

It ~QX,ANDER,RO=SSOR k

+-’T~SIMULATED

STEREO

1 2 3 14 15” 678 9 10 11 _l 2

—

Rin Grl Gr2 Gr3 Gr4 M/g Ref SPC Qi S/Q Rout Gnd

TDA8424 <Sound Controller>

bass Lbass Rtreble Ltreble R

fihfihz~

L-IN –

R-lN -

stereo/spatial 16 15 67 14 8

,----------- -

1-.v ---

1111 I11

------------------------ ,,,

,----------------------------- ,J,

TDA8424 POWER

SUPPLY

zL-OUT

+R-OUT

11’ Vcap SDA SCL D’.GND

Vcc GND

-7-

Service Adjustments Location

HORIZONTAL WIDTH ADJ

I\u

FOCUS ADJ. ‘+B POWER SUPPLY CHECK

SCREEN VR d

Protection Circuit

This TV set has abuilt-in power supply protection circuit.

It is provided to protect the TV set in case of apower 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 24 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 15 to

switch off the power supply lines.

■Releasing the protective ch’cuitand 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 adamaged circuit, power cannot be

restored and the circuit will have to be repaired.

-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 [3].

[1] Initializing Procedure

1.Put anew memory IC.

2. Turn on the TV set.

3. Press and hold the ~V/AV] button on the TV set more than 2seconds. The following picture appears on the screen.

CLR

4. Press the [FUNCTION] button on the TV set while the above On-Screen Display is still on the screen. The following

picture appears on the screen.

AUTO

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

-Set volume control value to 10/63 steps.

-Set all of control values in PERSONAL mode to initial value shown in below table.

Note: When the memory IC replaced, the CPU writes the controls initial value to the replaced

memory IC as shown in below table.

Controls PERSONAL DYNAMIC NATURAL SOFT GAME

COLOUR 31/63 35/63 31/63 31/63 23/63

BRIGHT 31/63 33/63 31/63 34/63 26/63

CONTRAST 55/63 63/63 55/63 26/63 20/63

TINT 31/63 31/63 31/63 31/63 31/63

SHARPNESS 31/63 48/63 31/63 24/63 10/63

BASS*1 7/147/1 47/1 47/1 47/14

TREBLE*1 7/147/1 47/1 47/1 47/14

BALANCE*1 7/147/1 47/147/1 47/14

Note: ●1Only available for Stereo decoder equipped model

-9-

[2] Required Service Adjustments

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

SIF adjustment Item 07, SIF

Grey scale adjustment Item 23-24, DRV

Further adjustment please refer to “Service adjustment-1” on page 13.

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

ments.

Service mode adjustments table in CPU ROM

No. Item Initial value Range Description

01 H-P 80-15 Horizontal centre adjustment

02 v-P 40-7 Vertical centre adjustment

03 v-s 80 0-127 Vertical size adjustment

04 OSD 10-15 OSD position adjustment

05 AGC 64 0-127 RF AGC adjustment

06 Vco 128 0-255 VCO (AFT) adjustment

07 SIF o0-3 SIF VCO adjustment

08 SELF o0-15 SELF-adjusting

09 DLT 20-3 DL-time adjustment

10 DLF o0, 1DL-fine adjustment

11 B-ST o0, 1Black stretch on/off setting

12 ABCL 10, 1ABCL adjustment

13 AB-G o0, 1ABCL gain adjustment

14 TRAP 30-3 Trap frequency adjustment

15 WBK o0, 1White back setting

16 BBK o0, 1Blue back setting

17 AFCG 20-2 AFC gain adjustment

18 RBI o0-255 Red bias adjustment

19 GBI o0-255 Green bias adjustment

20 BBI o0-255 Blue bias adjustment

21 RD 64 0-127 Red drive adjustment

22 BD 64 0-127 Blue drive adjustment

23 DRV .. -- White balance adjustment +Grey scale adjustment

24 -- -- -- Y-cut setting

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.

-1o-

Table des matières

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