Sharp 37GT-28FP Manual de usuario

37GT-28FP

SHARP CORPORATION

CONTENTS

PAL / SECAM SYSTEM COLOUR TELEVISION

S0037GT28FP00

SQUAD-T CHASSIS

SERVICE MANUAL

In the interests of user safety (required by safety

regulationsinsomecountries)thesetshouldrestored

to its original condition and only parts identical to

those specified should be used.

MODEL 37GT-28FP

Issued:14th March 2002

This document has been published to

be used for after sales service only.

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

IMPORTANT SERVICE NOTES.......................4

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

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

COMPONENT LOCATION TABLES................14

ICs ADDITIONAL INFORMATION..................17

○○

SCHEMATIC DIAGRAM, WAVE FORMS.......24

BLOCK DIAGRAM..........................................30

TROUBLESHOOTING TABLES......................32

PART LIST.......................................................37

PACKING OF THE SET...................................42

REMOTE CONTROL DESCRIPTION..............43

37GT-28FP

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

If only part number changes are required, just change part number directly the part number in the Parts Listing Section.

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

SERVICE MANUAL UPDATE LOG SHEET

Part No.

Technical Report No.

Technical Bulletin No. Cause / Solution Page No. Application

Data /Serial No.

37GT-28FP

ELECTRICAL SPECIFICATIONS

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

•Power Consumption

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

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

Normal Operating....................................30W

(Method IEC60107)

Stand-by Operating................................7.5W

•White Level

Setbrightnesscontroltogettotalpicturetubecathodecurrentof600uAundernosignalcondition.Maximum necessary

correction of each picture tube cathode current to get 8950 degree K-20 MPCD screen temperature should not

exceed 15% of its original value.

X=0.290 Y=0.284

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

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

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

•Sound Carrier Trap

L’..........................................................40.4MHz

L...........................................................32.4MHz

B/G.......................................................33.4MHz

•Picture Intermediate Frecuencies

L’.........................................................33.9MHz

L, B/G..................................................38.9MHz

•Adjacent Sound Carrier Trap

L’..........................................................32.4MHz

L, B/G...................................................40.4MHz

•Adjacent Picture Carrier Trap

L’..........................................................41.9MHz

L...........................................................30.9MHz

B/G.......................................................30.9MHz

•Aerial Input Impedance

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

•Tuning Ranges

CATV Special Channels

L/L’..........................55.75MHz thru 855.25 MHz

B/G.........................48.25MHz thru 855.25 MHz

WARNING

The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug

and power receptacle, when servicing this chassis.

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

qualified service personnel.

Specifications are subject to change without prior notice.

37GT-28FP

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

Itis important thatthe static chargeisremovedfromthehigh voltage system whencarryingoutworkon

thereceiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from the

CRT cavity connectortothe CRTgroundtag.This must becarriedout with theACsupply disconnected

from the receiver.

Note the following:

•The CRT in this receiver employs Integral Implosion Protection.

•If the CRThas 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

Thisreceiverisdesignedtokeepanyx-rayemissiontoanabsoluteminimum.Somefaultconditions 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 30KV,

at a instantaneous beam current of 300µΑ).

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

800µΑ). Thislevelhasbeenpre-setinthefactory.Alwayscheckthatthislevelhasnotbeenexceeded

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

Inadditiontotheabovechecks,thefollowingshouldalsobecarriedoutbefore returningthereceiver to

the customer.

1.Inspectalltheleadstoensurethattheyaredressedcorrectlyandthattheyarenotobstructedorpinched

by any other parts.

2.Ensurethatallprotectivedevicesareingoodcondition.Thesewillincludenonmetalliccontrolknobs,

insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators, etc.

IMPORTANT SERVICING NOTES

SERVICING OF HIGH VOLTAGE SYSTEM AND CRT

37GT-28FP

Indicates operative Service Mode

Auto Gain Control

Auto Frecquency Control Fine PAL B/G

Auto Frecquency Control Coarse SECAM B/G, L

Auto Frecquency Control Fine L’

Auto Frecquency Control Coarse L’

HorizontalShift

Vertical Shift

Verical Amplitud

Red Gain

Green Gain

Blue Gain

Red Cut Off

Green Cut Off

NVM Data Change

SERVICE ADJUSTMENT

Service Mode Function

XXXX

POS (Green)

VALUE (Red)

-SERV-

AGC

AFT F

AFT C

AFT FL

AFT CL

H-SHFT

V-SHFT

V-AMPL

GAIN R

GAIN G

GAIN B

CUT R

CUT G

NVM

Displayed

on screen Hexadecimal /

Decim. Range Function

00∼ 3F

02∼ FE

00∼ 0F

02∼ FE

00∼ 0F

00∼ FF

00∼ 3F

00∼ 0F

00∼ 3F

00∼ FF

1. Turn the receiver on and ensure that it is tuned into a test pattern.

2. Turn the receiver off using the mains switch.

3. Press the volume down and channel up buttons together. See Fig. 1.

4. Continue pressing the volume down and channel up buttons while turning

the mains on using the mains switch. See Fig. 1.

5. Keep pressing the volume down and channel up buttons until the picture appears.

6. Release the two buttons and the receiver is now in the service mode.

To move between the various service mode functions, use the channel up and down buttons.

Use the volume buttons to change the data to the desired value.

The data will be stored automatically when exiting the service mode.

To exit the service mode, press the stand-by button on the remote control or turn the receiver off

with the mains switch.

On Screen

Display

(Blue)

}

All required adjustments for servicing this TV set, may be done in «Service Mode», excepting G2 and FOCUS.

How to access the Service Mode

Fig. 1

37GT-28FP

Adjustment of Data within the NVM memory

To access the NVM memory, press the channel up buttonontheremote 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

hexadecimalcode,each code comprises of two hexadecimal numbers. Each of these numbers will break downintoafour

bit binary code as in the example below.

Hex code A 5

Binary code 1010 0101

Button on remote to toggle Bit 7654 3210

Inthe example given above, the hexadecimal code is A5, the binary equivalentis10100101.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.

Note: In the tables below appear b0, b1, b2,.........,b7, whose indicate the bit number:

b0 is the Least Significant Bit (LSB).

b7 is the Most Significant Bit (MSB).

VALUE DESCRIPTION ADDRESS

44 RESERVED

b7: x

b6: CO_BLK

b5: SVHS

b4: FRAME_BLK

b3: BLACK_ST_REF

b2: S_STD2

b1: S_STD1

b0: QSS

38 RESERVED

b7: BLACK_ST

b6: COR

b5: CK_ON

b6: COR

b5: CK_ON

b4: VID_ST2

b3: VID_ST1

b2: CK_1

b1: CK_2

b0: CK_3

A5 SIGNATURE VALUE 11

32 TEMPERATURE RED 12

32 TEMPERATURE GREEN 13

32 TEMPERATURE BLUE 14

26 VERTICAL SHIFT 15

32 RED CUTOFF 16

32 GREEN CUTOFF 17

1F HORIZONTAL SHIFT 18

37 VERTICAL AMPLITUDE 19

08 LUMA DELAY

b6-b5:AUDIO OUT

b4-b5: 00

b3: LUMA DELAY SHIFT

b1-b2:00

b0: V OUT INHIBITION

1 A

VALUE DESCRIPTION ADDRESS

32 TEMPERATURE RED 00

32 TEMPERATURE GREEN 01

32 TEMPERATURE BLUE 02

26 VERTICAL SHIFT 50HZ 03

32 RED CUTOFF 04

32 GREEN CUTOFF 05

1F HORIZONTAL SHIFT 50HZ 06

37 VERTICAL AMPLITUDE 07

08 LUMA DELAY

b6-b5:AUDIO OUT

b4-b5: 00

b3: LUMA DELAY SHIFT

b1-b2:00

b0: V OUT INHIBITION

2C CAG ADJUSTEMENT VALUE 09

63 TV OPTIONS

b7: ENGLISH OSD

b6: AUTOINSTALLATION FIRST

OPTION

b5: CHILD LOCK ENABLED

b4: X

b3: UHF BAND ONLY

b2: BASIC HOTEL MODE

b1: AV FRONT ENABLED

b0: FP VERSION

3A AFT COARSE FOR B/G AND L'

SYSTEMS 0B

38 AFT FINE FOR B/G AND L

SYSTEMS 0C

92 AFT FINE FOR L' SYSTEMS 0D

FF VOLUME LIMIT (MAXIMUM) 0E

NVM List Description

37GT-28FP

VALUE DESCRIPTION ADDRESS

2C CAG ADJUSTEMENT VALUE 1B

63 TV OPTIONS

b7:

ENGLISH OSD

b6: AUTOINSTALLATION FIRST

OPTION

b5: CHILD LOCK ENABLED

b4: X

b3:

UHF BAND ONLY

b2:

BASIC HOTEL MODE

b1: AV FRONT ENABLED

b0: FP VERSION

3A AFT COARSE FOR B/G AND L'

SYSTEMS 1D

38 AFT FINE FOR B/G AND L

SYSTEMS 1E

92 AFT FINE FOR L' SYSTEMS 1F

FF VOLUME LIMIT (MAXIMUM) 20

44 RESERVED

b7: X

b6: CO_BLK

b5: SVHS

b4: FRAME_BLK

b3: BLACK_ST_REF

b2: S_STD2

b1: S_STD1

b0: QSS

38 RESERVED

b7: BLACK_ST

b6: COR

b5: CK_ON

b6: COR

b5: CK_ON

b4: VID_ST2

b3: VID_ST1

b2: CK_1

b1: CK_2

b0: CK_3

A5 SIGNATURE VALUE 23

32 TEMPERATURE RED 24

32 TEMPERATURE GREEN 25

32 TEMPERATURE BLUE 26

26 VERTICAL SHIFT 27

32 RED CUTOFF 28

32 GREEN CUTOFF 29

1F HORIZONTAL SHIFT 2 A

37 VERTICAL AMPLITUDE 2B

08 LUMA DELAY

b6-b5:AUDIO OUT

b4-b5: 00

b3: LUMA DELAY SHIFT

b1-b2:00

b0: V OUT INHIBITION

2C CAG ADJUSTEMENT VALUE 2D

63 TV OPTIONS

b7:

ENGLISH OSD

b6: AUTOINSTALLATION FIRST

OPTION

b5: CHILD LOCK ENABLED

b4: X

b3:

UHF BAND ONLY

b2:

BASIC HOTEL MODE

b1: AV FRONT ENABLED

b0: FP VERSION

3A AFT COARSE FOR B/G AND L'

SYSTEMS 2F

VALUE DESCRIPTION ADDRESS

38 AFT FINE FOR B/G AND L

SYSTEMS 30

92 AFT FINE FOR L' SYSTEMS 31

FF VOLUME LIMIT (MAXIMUM) 32

44 RESERVED

b7: X

b6: CO_BLK

b5: SVHS

b4: FRAME_BLK

b3: BLACK_ST_REF

b2: S_STD2

b1: S_STD1

b0: QSS

38 RESERVED

b7: BLACK_ST

b6: COR

b5: CK_ON

b6: COR

b5: CK_ON

b4: VID_ST2

b3: VID_ST1

b2: CK_1

b1: CK_2

b0: CK_3

A5 SIGNATURE VALUE 35

A5 SIGNATURE VALUE 37

20 NVM SATURATION 38

05 OFFSET FOR VOLUME CURVE 39

1E VOLUME VALUE (DECIMAL) 3A

31 CONTRAST 3B

19 COLOR SATURATION 3C

20 BRIGHTNESS 3D

07 0,0,P5,P4,P3,P2,P1,P0

LUMA PEAKING VALUE LUPK 3E

01 CURRENT PROGRAM 3F

00 TV STATUS: 00H

TV ON

FFH

TV STBY 40

36 FACTORY CONTRAST 41

19 FACTORY COLOR SATURATION 42

20 FACTORY BRIGHTNESS 43

06 FACTORY PEAKING

b5-b0: LUMA PEAKING VALUE 44

16 END OF HORIZONTAL CLAMP

PULSE 45

19 OSD STATUS

b6: X

b5: PIN ENABLED

b4: CLOCK

b3 R8/30

b2: FRONT LOCK

b1: AV LOCK

b0: E_NORMALIZED PICTURE

06 TXT AND OSD OPTIONS

b7: X

b6: ROW 8/30 (TXT)

PREPROCESSING FOR UK

b5: PASSWORD ON/OFF

b4: OSD REMAINING TIME

b3: SIZE OSD PROG: 0= 14”

1= 21”

b2: VPS LOCK ON / OFF

b1: FLOF

b0: TOP

37GT-28FP

VALUE DESCRIPTION ADDRESS

00 BEGINING OF HORIZONTAL

CLAMP PULSE. 48

1F VOLTAGE TO CHANGE TO L-L'

SYSTEM 49

1F VOLTAGE TO CHANGE TO L-L'

SYSTEM 4A

1A VERTICAL SYNC DELAY FOR TXT. 4B

69 SLICER CONTROL TTX ->

NIBBLE_UP = /NIBBLE_DOWN 4C

F0 CHANNEL SEARCH SPEED [UHF] 4D

F0 CHANNEL SEARCH SPEED [VHL] 4E

F0 CHANNEL SEARCH SPEED [VHH] 4F

AA HORIZONTAL SYNC DELAY 50

00 PASSWORD 1st DIGIT 51

00 PASSWORD 2nd DIGIT 52

00 PASSWORD 3rd DIGIT 53

00 PASSWORD 4th DIGIT 54

01 CHARACTER SET (LANGUAGE

TXT) 55

40 MAXIMUM TUNNING VOLTAGE

DECREASE DURING PROG.

CHANGE (IN CASE IT IS NOT

FOUND THE SYNCHRO)

VALUE DESCRIPTION ADDRESS

00 b0: HOTEL MODE: DEACTIVATE

THE TV PANEL FRONTAL KEY.

IT STARTS UP IN SCART

MODE

WHEN SSW SIGNAL IS GIVEN

b1: SPECIAL HOTEL MODE FOR

S.E.I.S. THE TIME CONSTANT

TO VCR MODE

b2: OPTION FOR DK_SYSTEM.

b3: AUTOINSTALL ON.

b4: COUNTRY SELECTION

MENU.

b5-b6: RGB DACs LEVEL.

b7: VPS_LOCK_SET

0F TIMING PACKET SEARCH, VPS. 58

20 VERTICAL SHIFT FOR 60HZ 59

BB ONE STEP DOWN WHEN THE

FIRST SYNCHRO LOOSING IS

PRODUCED

15 UP MAXIMUM STEP No DURING

SEARCHING (



). 5B

00 CORRECTION VALUE OF V-SHIFT

IN ORDER TO BE INDEPENDENT

TO V-AMP BAND OFFSET SPEED

DURING SEARCHING

15 AUTOMATIC PEAK RGB

REGULATION: PIC REGULATOR 5D

D2 BAND OFFSET SPEED DURING

SEARCHING (



)

NIBBLE_UP=/ NIBBLE_DOWN

00 FREE 5F

10 TIMING PACKET SEARCH, 8/30. 60

---- RESERVED 61

PIF/AGC Adjustment

1. B/G, L “AFT C”should not be adjusted. The value should be fixed to 0A.

2. B/G, L “AFT F”Adjustment

2.1. Connect the output of SSG (Standard Signal Generator) to the tuner IF output terminal.

·SSG output 38.9 MHz (CW) ± 5 KHz.

·SSG output level: approx. 90 dB/uV.

2.2. Enter into Service Mode.

2.3. Select parameter AFT F.

2.4. Push «CALL»button on R/C, see Page 43. «AFT OK»will appear in On Screen Display (OSD).

2.5. Switch set OFF and ON again, setting is now memorized.

3. L’“AFT C”should not be adjusted. The value should be fixed to 03.

4. L’“AFT FL”Adjustment

4.1. Connect the output of SSG (Standard Signal Generator) to the turner IF output terminal.

·SSG output 34.47MHz (CW) ± 5 KHz.

·SSG output level: approx. 90 dB/uV.

4.2. Enter into Service Mode.

4.3. Select parameter AFT FL.

4.4. Push «CALL»button on R/C, see Page 43. «AFT OK»will appear in OSD.

4.5. Switch set OFF and ON again, setting is now memorized.

5. RF-AGC Adjustment

5.1. Receive the “COLOUR Bar”Signal (Channel E-10). Signal strength: 53dB/uV

5.2. Enter into Service Mode.

5.3. Select parameter AGC.

5.4. Push “CALL”button on R/C, see Page 43. “BUS STOP”will appear in OSD.

37GT-28FP

Screen Adjustment

1. Focus Adjustment

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

1.2. Receive Philips pattern signal to a level between 60 and 80 dB/uV.

1.3. Set contrast to 10/10, brightness to 5/10 and colour 0/10.

1.4. Adjust focus potentiometer to obtain maximum definition.

2.G2 Adjustment

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

2.2. Receive the “Cross Hatch”pattern signal to a level between 60 and 80 dB/uV.

2.3. Apply High Voltage Probe to Pin 8 of CRT socket

2.4. Adjust G2 potentiometer until obtaining 525V ±10%.

2.5. Check BKGD. If it is necessary adjust BKGD according to instructions detailed below.

Geometry Adjustment Procedure

1. Horizontal Shift

1.1. Receive Philips pattern signal.

1.2 Select H-SHFT with channel up or channel down buttons.

1.3. When volume up button is pressed, picture moves to the left.

1.4. When volume down button is pressed, picture moves to the right.

1.5. Adjust the horizontal location to obtain picture centering (Fig.2).

Fig. 2

2. Vertical Shift

2.1. Receive Philips pattern signal.

2.2. Select V-SHFT with channel up or channel down buttons.

2.3. When volume up button is pressed, picture moves up.

2.4. When volume down button is pressed, picture moves down.

2.5. Adjust the vertical location to obtain picture centering (Fig.3).

Fig. 3

3. Vertical Amplifier

3.1. Receive Philips pattern signal.

3.2. Select V-AMPL with channel up or channel down buttons.

3.3. When volume up button is pressed, vertical size of picture increases.

3.4. When volume down button is pressed, vertical size of picture decreases.

3.5. Adjust the vertical size to obtain picture overscan (Fig.4).

Fig. 4

The following adjustments are required when the Picture Tube or IC801 are replaced, or may be nec-

essary after adjustment of the G2 voltage.

Colour Adjustment (BKGD) Procedures

1. «B-GAIN», «G-GAIN»

1.1. Adjust G2.

1.2. Tune a grey scale pattern.

1.3. Adjust colour to minimum.

1.4. Fix R-GAIN value to 32.

1.5. Position colorimeter in the left point of Fig.5.

1.6. Using brightness and contrast buttons, select a luminance of »120 nits.

1.7. Operate again in Service Mode and select location B-GAIN and G-GAIN to obtain colour coordinates:

X = 0.290 ± 0.015

Y = 0.284 ± 0.015

6 5 4 3 2 1 0

Gain point

DC point

5.5. Push “GREEN”button on R/C (to exit Bus Stop Mode).

5.6. Switch set OFF and ON again, setting is now memorized.

Fig. 5

37GT-28FP

Procedure to Program Functions of Hotel Mode

Below listed can be found the procedure to carry out in the above TV Sets functions called HOTEL MODE as follows:

Consider that HOTEL MODE is implemented by means of HOTEL MODE 1. The HOTEL MODE 2 or HOTEL MODE 3

can be used at the same time than HOTEL MODE 1.

HOTEL 1 Blockade of tuning functions Restriction of sound

HOTEL 2 Blockade of tuning functions Start on SCART mode + SW when

SCART IS ACTIVE (Front Panel inactive)

HOTEL 3 Blockade of tuning functions VCR constant changed

Hotel 1 Mode: blockade of the TUNING function by modifying the value in 0A address of the NVM.

-This change besides blocking the tuning function, makes the TV always starts to operate in program 1.

Procedure:

A) Press the volume up or volume down buttons (RC) as far as the NVM address (green colour) displays “0A”location.

Check the NVM value (red colour) displays the NORMAL VALUE .

B)Pay Attention: Press the button 2 (RC) only once. The NORMAL VALUE has been changed to the HOTEL 1 MODE

VALUE now. If the button 2 (RC) is pressed again the NORMAL VALUE is recovered. For the same reason, if a wrong

button has been pressed, NORMAL VALUE can be recovered by pressing the same button again. See NVM table on

page 6.

Restriction of Sound Volume: by modifying the value in 0E address of the NVM.

Notes:

a) Before blocking the tuning function is necessary to memorise the programs according to the necessities of the destina-

tion hotel.

b) Since the Hotel Mode functions have been programmed the end users of the television won’t be able to tune different

channels neither to erase the existent ones.

1.8. Exit Service Mode and check colour coordinates «X»and «Y»at 20 and 120 nits. It may be necessary to repeat the

same procedure or readjust the cuts as show the be below one.

2. «CUT R», «CUT G»

2.1. Adjust G2, in the case that it has not been made previously.

2.2. Tune a grey scale pattern.

2.3. Adjust colour to minimum.

2.4. Position colorimeter in the right point of Fig.4.

2.5. Using brightness and contrast buttons, select a luminance of »20 nits.

2.6. Operate again in Service Mode and select location CUT-G and CUT-R to obtain colour coordinates:

X = 0.290 ± 0.015

Y = 0.284 ± 0.015

2.7. Exit Service Mode and check colour coordinates «X»and «Y»at 20 and 120 nits. It may be necessary to repeat

the same procedure or the previous one.

Cancel password (PIN)

The following process describes how to cancel actual password (PIN) when the customer forgets the code.

1. Press channel up or down to select the channel, wich you locked with input PIN number.

2. The TV picture will be blue and the key appear on screen.

3. Press and hold volume down on the TV and simultaneously press CHILD LOCK button (see Page.43) on the remote

control several times until the key disappears.

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