Sharp 37GT-25S Manuel utilisateur

37GT-25S

SERVICE MANUAL

SHARP CORPORATION

PAL SYSTEM COLOUR TELEVISION

SEJB37GT25S00

GA-1 CHASSIS

In the interests of user safety (required by safety

regulations in some countries) the set should restored

to its original condition and only parts identical to

those specified should be used.

MODEL 37GT-25S

Issued: 31st Oct. ‘00

This document has been published to

be used for after sales service only.

ELECTRICAL SPECIFICATION........................3

IMPORTANT SERVICING NOTES....................4

SERVICE ADJUSTMENTS................................5

PRINTED WIRING BOARDS...........................12

SOLID STATE DEVICE BASE DIAGRAM.......20

SCHEMATIC DIAGRAM, WAVE FORMS........21

TROUBLESHOOTING TABLES......................28

PARTS ALLOCATION TABLES.......................16 PART LIST.......................................................30

BLOCK DIAGRAM...........................................26

CONTENTS

37GT-25S

Use this page to keep any special servicing information as Thecnical Report (Bulletin), Technical Information, etc.

If only part number changes are required, just change part number directly on Part List Section.

If you need more information, please refer to the Technical Report (Bulletin).

SERVICE MANUAL UPDATE LOG SHEET

Part #

Technical Report #

Technical Bulletin # Cause / Solution Page # Application

Data /Serial #

37GT-25S

ELECTRICAL SPECIFICATIONS

•Power Input .......................220V-240 Volts AC 50Hz

•Power Consumption

•Audio Power Output Rating .....................2W (MPO)

Speaker............................32Ω2W, 8cm Round, 1pc

Normal Operation....................................34W

Stand-by Operation................................7.0W

•White Level

Set the brightness control, with no signal connected, so that the CRT cathode current is 600mA. The maximum

correction applied to each cathode current to achieve a screen temperature of 8550 degrees K-1 MPCD should not

exceed 15% of its original value.

X=0.290 Y=0.300

WARNING

The chassis in this receiver is partially live, always use an isolation transformer when

servicing this chassis.

To prevent electric shock, do not remove cover. No user-serviceable parts inside. Refer

servicing to qualified service personnel.

Convergence.........................Self Converging System

Focus....................................Bi-Potencial Electrostatic

Sweep Deflection...........................................Magnetic

Specifictions are subject to change without prior notice.

•Aerial Input Impedance

VHF/UHF...........................75 ohm Unbalanced

•Tuning Ranges .............48.25MHz thru 855.25 MHz

VHF.........................................CH02-CH12, S1-S41

UHF.......................................................CH21-CH69

•Picture Intermediate Frecuency................38.9MHz

•Sound Carrier Trap.............................33.4MHz

•Adjacent Sound Carrier Trap................40.4MHz

•Adjacent Picture Carrier Trap...............31.9MHz

37GT-25S

Only qualified service personnel are allowed to carry out mintenance and repair of this receiver.

It is important that the static charge is removed from the high voltage system when carrying out

work on the receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated

lead) from the CRT cavity connector to the CRT ground tag. This must be carried out with the AC

supply disconnected from the reciver.

Note the following:

•The CRT in this receiver employs Integral Implosion Protection.

•If the CRT has to be changed it MUST be replaced with the correct type for continued safe

working

•DO NOT lift the CRT by its neck.

•When handing the CRT, ensure that shatterproof goggles are worn.

•Ensure that the CRT is discharge before handling.

X-RAY

This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions

and servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem

when in close proximity to the receiver for long periods of time. To reduce any risks associated with

this, please observe the following precautions:

1. When undertaking any servicing on this chassis, DO NOT increase the EHT to more than 29.5 KV,

(at a instantaneous beam current of 1000µΑ).

2. Ensure that during normal operation the EHT does not exceed 27.5KV±1.5KV (at a beam current of

800µΑ). Tjis level has been pre-set in the factory. Always check that this level has not been exceeded

after carrying out any repair on the receiver..

3. DO NOT replace the CRT with any other type than that specified in the parts listing as this may

cause excessive x-ray radiation.

BEFORE RETURNING THE RECEIVER TO THE CUSTOMER

In addition to the above checks, the following should also be carried out before returning the receiver

to the customer.

1. Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or

pinched by any other parts.

2. Ensure that all protective devices are in good condition. These will include non-metallic control

knobs, insulating fish papers, cabinets backs, compartment covers or shieds, mechanical insulators,

etc.

IMPORTANT SERVICING NOTES

SERVICING OF HIGH VOLTAGE SYSTEM AND CRT

37GT-25S

SERVICE ADJUSTMENT

•SERVICE MODE FUNCTION

1. Connect a test pattern to the antenna terminal.

2. Tune the receiver to this signal.

3. Turn the receiver off using the mains switch.

4. Press the volume down and channel up buttons on the front of the receiver at the same time.

5. Keeping these buttons pressed, turn the mains on.

6. When the set starts up it will be in service mode.

7. Release the two buttons.

•Use the channel up and down buttons to move between the options.

•Use the volume control buttons to change the data.

•The data is stored automatically when the service mode is exited or at switch off.

•To exit the service mode, press the standby or menu button on the remote control.

To ensure correct operation of the AFT, this must be adjusted to 40.

-SERV-

AGC

AFT

H-SHIFT

V-SHIFT

V-AMPL

V- SLOP

S-CORR

Y-DLY

GAIN R

GAIN G

GAIN B

NVM

00∼ 3F

00 ∼ 7F

00 ∼3F

00 ∼FF

Indicates operative Service Mode

Auto Gain Control

Auto Frequency Control

Horizontal Shift

Vertical Shift

Vertical Amplitude

Vertical Symmetry

S Correction

Luminance/Chrominance Delay

Red Gain

Green Gain

Blue Gain

NVM Data Change

On Screen

Display

Hexadecimal

Adjustment

Range

Function

XXXX

On Screen

Display

Hexadecimal

Adjustment

Range

○○○○○○○

37GT-25S

Adjustment of Data within the NVM memory

To access the NVM memory, press the channel up button on the remote control until the NVM setting is

reached. Note that the NVM address is shown in green and the NVM value is shown in red.

Each of the NVM values are stored as a hexadecimal code, each code comprises of two hexadecimal

numbers. Each of these numbers will break down into a four bit binary code as in the example below.

Hex code A 5

Binary code 1010 0101

Button on remote to toggle Bit 7654 3210

In the example given above, the hexadecimal code is A5, the binary equivalent is 1010 0101. The remote

control button to toggle each bit on or off (1 or a 0) is shown below the binary code. Therefore to change this

to A6, remote control buttons 1 then 0 would have to be pressed.

NVM LIST DESCRIPTION

PAGE ADDRESS DESCRIPTION VALUE

00 RTEMP: TEMPERATURE RED 15

01 GTEMP: TEMPERATURE GREEN 11

02 BTEMP : TEMPERATURE BLUE 09

03 VSHIFT: VERTICAL SHIFT 3B

04 HSHIFT: HORIZONTAL SHIFT 1E

05 VTAMP: VERTICAL AMPLITUDE 28

06 VSLOPE: VERTICAL SLOPE 14

0 Y_DELAY: LUMA DELAY 08

08 Y_DELAY_S: LUMA DELAY SECAM 08

09 S_CORR: S-CORRECTION 02

0A E_CAG : CAG ADJUSTEMENT VALUE 0F

0B EA_OPT: TV OPTIONS

0: FP: SYSTEM B/G (0)- B/G+L, MESSAGE RECHERCHE

1: AV FRONTAL: NOT INCLUDED(0), INCLUDED(1)

2: TUNING LOCK (HOTEL): LOCKED+SWITCH-ON PR1(1)

NO LOCKED (0)

3: UHF-ONLY: BAND UHF(1) ALL BANDS(0)

4: PAL ONLY(1), PAL+ SECAM(0)

5: CHILD LOCK: CHILD LOCK ACTIVE(1)

CHILD LOCK NO ACT(0)

6: AUTO FIRST: TUNING FIRST MENU: AUTO (1)

MANUAL (0)

: ING_OSD: OSD_ENGLISH(1) OSD-SYMBOL(0)

0C EAFT: AFT ADJ FOR B/G & L SYSTEMS 40

0D EAFT_: AFT ADJ FOR L' SYSTEMS 1F

0E EVOLMAX: MAX. VOLUME LIMIT FF

0F CHECKSUM: SIGNATURE A5

10 RTEMP2: TEMPERATURE RED 15

11 GTEMP2: TEMPERATURE GREEN 11

12 BTEMP2: TEMPERATURE BLUE 09

13 VSHIFT2: VERTICAL SHIFT 3B

14 HSHIFT2: HORIZONTAL SHIFT 1E

15 VTAMP2: VERTICAL AMPLITUDE 28

16 VSLOPE2: VERTICAL SLOPE 14

1 Y_DELAY2: LUMA DELAY 08

18 Y_DELAY_S2: LUMA DELAY SECAM 08

37GT-25S

PAGE ADDRESS DESCRIPTION VALUE

19 S_CORR2: S-CORRECTION 02

1A E_CAG2: CAG ADJUSTEMENT VALUE 0F

1B EA_OPT2: TV OPTIONS

0: FP: SYSTEM B/G (0)- B/G+L, MESSAGE RECHERCHE

1: AV FRONTAL: NOT INCLUDED(0), INCLUDED(1)

2: TUNING LOCK (HOTEL): LOCKED+SWITCH-ON PR1(1)

NO LOCKED (0)

3: UHF-ONLY: BAND UHF(1) ALL BANDS(0)

4: PAL ONLY(1), PAL+ SECAM(0)

5: CHILD LOCK: CHILD LOCK ACTIVE(1)

CHILD LOCK NO ACT(0)

6: AUTO FIRST: TUNING FIRST MENU: AUTO (1)

MANUAL (0)

: ING_OSD: OSD_ENGLISH(1) OSD-SYMBOL(0)

1C EAFT2: AFT ADJ FOR B/G & L SYSTEMS 40

1D EAFT2_L: AFT ADJ FOR L' SYSTEMS 1F

1E EVOLMAX2: MAX. VOLUME LIMIT FF

1F CHECKSUM: SIGNATURE A5

20 RTEMP3: TEMPERATURE RED 15

21 GTEMP3: TEMPERATURE GREEN 11

22 BTEMP3: TEMPERATURE BLUE 09

23 VSHIFT3: VERTICAL SHIFT 3B

24 HSHIFT3: HORIZONTAL SHIFT 1E

25 VTAMP3: VERTICAL AMPLITUDE 28

26 VSLOPE3: VERTICAL SLOPE 14

2 Y_DELAY3: LUMA DELAY PAL 08

28 Y_DELAY_S3: LUMA DELAY SECAM 08

29 S_CORR3: S-CORRECTION 00

2A E_CAG3: CAG ADJUSTEMENT VALUE 00

2B EA_OPT3: TV OPTIONS

0: FP: SYSTEM B/G (0)- B/G+L, MESSAGE RECHERCHE

1: AV FRONTAL: NOT INCLUDED(0), INCLUDED(1)

2: TUNING LOCK (HOTEL): LOCKED+SWITCH-ON PR1(1)

NO LOCKED (0)

3: UHF-ONLY: BAND UHF(1) ALL BANDS(0)

4: PAL ONLY(1), PAL+ SECAM(0)

5: CHILD LOCK: CHILD LOCK ACTIVE(1)

CHILD LOCK NO ACT(0)

6: AUTO FIRST: TUNING FIRST MENU: AUTO (1)

MANUAL (0)

: ING_OSD: OSD_ENGLISH(1) OSD-SYMBOL(0)

2C EAFT3: AFT ADJ FOR B/G & L SYSTEMS 40

2D EAFT3_L: AFT ADJ FOR L' SYSTEMS 1F

2E EVOLMAX3: LMAX. VOLUME LIMIT FF

2F CHECKSUM: SIGNATURE A5

30 FT1_I_NVM-T1_I_NVM-1: LENGTH TABLE FF

31 CHECKSUM: SIGNATURE 1 A5

32 EAGING,AGING_ON (AGING MODE) FF

33 VOLOFFSET: VOLUME OFFSET 05

34 EAVOL: VOLUME VALUE (DECIMAL) 14

35 CONT: CONTRAST 33

36 COLOR: COLOR SATURATION 1

3 BRIGHT: BRIGHTNESS 1F

38 LUPK: 0,0,P5,P4,P3,P2,P1,P0

LUMA PEAKING VALUE LUPK

39 E_P_ACT: CURRENT PROGRAMME 01

3A E_START: TV STATUS 00

37GT-25S

PAGE ADDRESS DESCRIPTION VALUE

3B N_HUE: HUE CORRECTION 0

3C CONT2: CONTRAST 33

3D COLOR2: COLOR SATURATION 1

3E BRIGHT: BRIGHTNESS 1F

3F LUPK2: 0,0,0,0,0,P2,P1,P3

LUMA PEAKING VALUE LUPK

40 DK_OPTION: OPTION FOR DK SYSTEM

[X X X X X X X DK_S]

41 HCR1_NVM: END OF HORIZONTAL CLAMP PULSE 13

42 OSD_WORD: OSD STATUS

(1=RT/0=OT,1=NO WHITE BARS IN MENU

CLOCK-D.C.-,PIN OPTION,R830-D.C.-,

FRONT LOCK,AV LOCK,

E_NORMALIZADO PICTURE)

43 OP_TXT_SYS: TELETEX SYSTEMS OPTIONS

(X X X X X X FLOF TOP)

44 HCR0_NVM: BEGINING OF HORIZONTAL CLAMP PULSE. 00

45 EVTH_L: L-L’ VOLTAGE 1F

46 EVTL_L: L-L’ VOLTAGE 1F

4 SDV0_TXT: VERTICAL SYNC DELAY FOR TXT. 1E

48 S_SPEED: SEARCH SPEED FOR ALL BANDS 0F

49 SU_SPEED: SEARCH SPEED FOR UHF 5 A

4 A SVL_SPEED: SEARCH SPEED FOR VHL 0F

4B SVH_SPEED: SEARCH SPEED FOR VHH 3C

4C L_RANGE: RESERVED 2F

4D EPSW: PASSWORD ACTIV 00

4E EPSW1: PASSWORD 1R DIGIT 00

4F EPSW2: PASSWORD 2§ DIGIT 00

50 EPSW3: PASSWORD 3R DIGIT 00

51 EPSW4: PASSWORD 4§ DIGIT 00

52 LANGUAGE: CHARACTER SET (FOR TXT) 00

53 OSD_WORD1: bit 0: SIZE OSD PROG: 0=14”, 1=21”

bit 1: TIMING FOR OSD ON SCREEN

bit 2: CHARACTER SET FOR TXT ENABLED (MENU)

54 HOTEL: FOR HOTEL MODE 2 : FRONTAL BUTTONS

DISABLED, SWITCH ON WITH SSW PULSE

55 IFS_SCRT: CONTROL FOR IFS IN SCART MODE. 01

56 HOTEL2: HOTEL MODE FOR S.E.I.S.

VCR CONSTANT FOR ALL PROGRAMS

5 B_CONTROL2: OSO,VSD,CB,BLS,BKS,CS1,CS0,BB 9 A

58 B_CONTROL3: HOB,BPS,ACL,CMB,AST,CL2,CL1,CL0 24

59 V_ZOOM: VERTICAL ZOOM 0D

5 A V_SCROLL: VERTICAL SCROLL 20

5B B_CONTROL0: INA,INB,INC,CCC_D,FOA,FOB,XA,XB 1 A

5C B_CONTROL1: FORF,FORS,DL,STB,POC,CM2,CM1,CM0 C0

5D B_CONTROL5: EVG,HCO,LBM,VID,STM,NCIN,VIM,AKB 26

5E B_CONTROL6: IFS,AFW,IE_1,COR,RBL,MAT,PRD,SBL 3C

5F B_CONTROL : 0,0,0,HBL,GAI,IE_2,DS,DSA 00

60 V_SCCON: SANDCASTLE CONTROL REGISTER 00

61∼ FF RESERVED ---

00 ∼ 9F RESERVED ---

A0 10

A1 02

A2 00

A3 30

A4 04

PAGE MEMORY FOR LIST MODE PROGRAM 0

37GT-25S

{

Page 100

{

Page 200

{

Page 300

{

Page 400

DEFAULT LIST MODE PAGES MEMORIZATION NOTE:

In page memory for LIST MODE, every digit is written in one nibble (4 bits).

The default values for programs 0∼7 are as follows: 100, 200, 300, 400.

Example: Program 0

NVM Position: A0 A1 A2 A3 A4 A5

{

NVM Value:

PAGE ADDRESS DESCRIPTION VALUE

A6 10

A7 02

A8 00

A9 30

AA 04

PAGE MEMORY FOR LIST MODE PROGRAM 1

AC 10

AD 02

AE 00

AF 30

B0 04

PAGE MEMORY FOR LIST MODE PROGRAM 2

B2 10

B3 02

B4 00

B5 30

B6 04

PAGE MEMORY FOR LIST MODE PROGRAM 3

B8 10

B9 02

BA 00

BB 30

BC 04

PAGE MEMORY FOR LIST MODE PROGRAM 4

BE 10

BF 02

C0 00

C1 30

C2 04

PAGE MEMORY FOR LIST MODE PROGRAM 5

C4 10

C5 02

C6 00

C7 30

C8 04

PAGE MEMORY FOR LIST MODE PROGRAM 6

CA 10

CB 02

CC 00

CD 30

CE 04

PAGE MEMORY FOR LIST MODE PROGRAM 7

D0 ∼ FF RESERVED FF

37GT-25S

Fig. 4

c) When ∨button is pressed, upper picture scanning increases and

lower picture scanning decreases.

d) Adjust the vertical symmetry to obtain symmetrical scanning between

upper and lower picture (Fig.4).

1. HOR SHIFT

a) Receive Philips pattern signal.

b) When ∧button is pressed, picture moves to the left.

c) When ∨button is pressed, picture moves to the right.

d) Adjust the horizontal location to obtain picture centering (Fig.1).

•GEOMETRY ADJUSTMENT PROCEDURE

2. VERT SHIFT

a) Receive Philips pattern signal.

b) When ∧button is pressed, picture moves up.

c) When ∨button is pressed, picture moves down.

d) Adjust the vertical location to obtain picture centering (Fig.2).

3. VERT AM

a) Receive Philips pattern signal.

b) When ∧button is pressed, vertical size of picture increases.

c) When ∨button is pressed, vertical size of picture decreases.

d) Adjust the vertical size to obtain picture overscan (Fig.3).

Fig. 2

Fig. 1

4. VERT SLOP Fig. 3

a) Receive Philips pattern signal.

b) When ∧button is pressed, upper picture scanning decreases and

lower picture scanning increases.

••

•PIF/AGC Adjustment ••

••

•Screen Adjustment

3. Focus Adjustment

Set contrast to 10/10, brightness to 5/10 and

colour 0/10.

Apply mains voltage of 220V AC/50HZ to TV.

Receive Philips pattern signal to a level between

60 and 80 dBµV.

Adjust focus potentiometer to obtain

maximum definition.

1. AFT Adjustment

AFT must be adjusted to a fixed value of 40.

Receive the «COLOUR BAR» signal (Channel E-

12). Signal strength: 53 dBµV.

2. RF-AGC Cut-In Adjustment (I2C BUS)

Switch set OFF and ON again, setting is now

memorized.

Enter into Service Mode.

Push CH ∧until AGC appears on screen.

Push key of R/C.Setting is made

automatically. During this setting the colour bar

shall go from red to yellow. When setting is

finished, colour bar disappears and B-STOP

(bus stop)is shown on screen.

4. G2 Adjustment

the screen VR of FBT.

5. Check BKGD. If it is necessary adjust BKGD

according to instructions detailed in the next

page.

Apply mains voltage of 220V AC/50HZ to TV.

Receive the «MONOSCOPE» pattern signal to a

level between 60 and 80 dBµV.

Enter into Service Mode. Press the TEXT key of

R/C and set to level.

Set to the point where the raster disappears on

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