Sharp 37DT Manual de usuario

SHARP

SERVICE

MANUAL

SEMH37ET35S//

CA-1 CHASSIS

PALSYSTEM COLOUR TELEVISION

MODEL_______ 37ET-35S

——————————————————————————————

In ordertoservicemodel37ET-35S,refertothe

previouslyissued ServiceManual formodel 37DT-25S.

Thismanual onlycontainsthe differencesbeweenthe

abovementionedmodels.

________________________________

In theinterestsofuser-safety(requiredby safety

regulationsin somecountries)thesetshouldbe

restoredtoitsoriginalconditionamd only parts identical

tothosespecifiedshouldbe used.

•PARTS

LIST

.......................................................................................................................................................................................

SHARP CORPORATION

The difference betweenthepreviousmodel37DT-25Sandthecurrentmodel37ET-35S,isonlythecabinet.

PARTS LIST(Only contains the differences)

CODE EX: EUROPEAN MARKET

CODE SP: SPANISH MARKET

* MARK: SPARE PARTS DELIVERY SECTION

REF.NO.PARTS

MISCELLANEOUSPARTS

CABINETPARTS

1-1

1-2

1-3

1-4

1-5

TINS-6586BMNO

CCABA1229BMVO

HBDGB1017BMSB

HDECQ0035BMSA

HDECQ0036BMSA

JBTN-1046BMSA

JBTN-1047BMSA

GCABB1067BMKA

DESCRIPTION

Operation Manual

FrontCabinet

BadgeSHARP

Window power

Window R/C

Button,Power

Button,Up/Down

RearCabinet

CODE

SHARP

SERVICE MANUAL

SEMC37DM23SC/

CA-1 CHASSIS

PAUSECAM SYSTEM COLOUR TELEVISION

MODEL

37DM-23SC

Inthe interests ofuser-safety (Required bysafety regula-

tions insome countries) the set should berestored to its

originalconditionandonlypartsidenticaltothosespecified

beused.

———————————————

CONTENTS

—————————————————

PagePage

•

ELECTRICAL SPECIFICATIONS

..........................2

•

PRINTED WIRING BOARDS

..........................12-13

•

IMPORTANT SERVICE

NOTES

............................3•

SCHEMATIC DIAGRAM AND

•

SERVICE ADJUSTMENTS

...............................4-10

WAVEFORMS

..................................................14-18

•

SOLID

STATE DEVICE BASE DIAGRAM

............10

•

BLOCK

DIAGRAMS

.........................................19-20

•CHASSIS

LAYOUT DIAGRAM

.............................11

.PARTS

LIST

.....................................................21-29

_________________________________________________________________

SHARP CORPORATION

37DM-23SC

ELECTRICAL SPECIFICATIONS

Aerial inputImpedance...........

Convergence...........................

Focus......................................

Audio Power Output Rating ....

Intermediate Frequencies

Picture IFCarrier Frequency ..

SoundIFCarrier Frequency B/G.............

D/K

.............

ColourSub-Carrier Frequency PAL (B/G)

......................................................................34.47MHz

SECAM (D/K)

......................................................

34.65/34.49375 MHz

(Normal)

........ 75ohmunbalanced

.Self Converging System

..Bipotential electrostatic

...............2Watt(M.P.O.)

38.9MHz

33.4MHz

32.4 MHz

Power Input.................

Power Consumption ...

Speaker Size...............

Voice CoilImpedance.

Sweep Deflection........

Tuning Ranges............

220/240VoltsAC 50Hz

............................

38Wh

.................8

cm (Round)

.........................

32ohms

.........................

Magnetic

.48.25MHz-855.25MHz

CATV Special channels

Specifications are subject to change without prior

notice.

WARNING

The chassis inthisreceiverispartiallyhot.Useanisolationtransformerbetweenthelinecordplugandpower

receptacle, when servicing this chassis.

Toprevent electric shock, donotremove cover. Nouser - serviceable parts inside.Refer servicing to qualified

service personnel.

IMPORTAMTSERVICE NOTES

Maintenance andrepairof this receiver shouldbecarried outbyqualifiedservice personnelonly.

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

When servicing the highvoltage system, remove static charge from itbyconnecting a 10k ohm resistor in

series with aninsulated wire (such as a test probe) between picture tube ground tag and high voltage lead

(AC linecord should bedisconnected from AC outlet).

1.Picture tube inthis receiver employs integral implosion protection.

2.Replace with tube of the same type number forcontinued safety.

3.Donotliftpicture tube by the neck.

4.Handlethe picture tube onlywhen wearingshatterproofgogglesandafterdischargingthe highvoltage

completely.

X-RAY

Thisreceiver isdesigned so that any X-Ray radiationiskeptto anabsolute minimum.Sincecertain

malfunctions or servicing may produce potentially hazardousradiationwith prolongedexposure atclose

range, the following precautions should beobserved.

1.Whenrepairingthecircuit,be sure not to increasethehigh voltageto more than

30.0kV (at beam 1000 uA)for the set.

2.To keep the set ina normal operation, besure to makeitfunctionon23.5 kV± 1.5kV (atbeam 800p.A),

inthe case of the set. The set hasbeen factory adjusted to the above mentioned highvoltage. Ifthere

isa possibility that the highvoltage fluctuates as result ofthe repairs, neverforget to check forsuch high

voltage after the work.

3.Donotsubstitute a picturetube with unauthorized types or brands which may cause excess X-Ray

radiation.

BEFORE RETURNING THE RECEIVER

Before returning the receiver tothe user, perform the following safety checks.

1.Inspect all leadinsulation to make certain that leads are not pinched or that hardware isnotlodged

between the chassis and other metal parts inthe receiver.

2.Inspect allprotective devices such as non-metallic control knobs,insulating fishpapers, cabinet backs,

adjustment andcompartment covers orshields,isolationresistor-capacity networks, mechanical

insulators, etc.

SERVICE ADJUSTMENTS

•SERVICE MODEFUNCTION

This mode function isprovided to assist with the settings ofthose adjustments that mayvary from one Picture Tube to

another,or between models.

Inorderto use the Service Mode

1.Press mainswitch to OFF.

2.Connect Test Pattern signal toantenna terminal.

3.Press V< and CH /\ buttons and mainswitch to ON simultaneously.

4.-SERV-will appear on screen. Service modeisnowentered.

5.Select adjustment using buttonsf\ CM V.

Toexit service mode,press mainswitch to OFFor press MENU button on R/C.

Displayed Hexadecimal

on Screen Range Function

-SERV- Indicatesoperative Service Mode.

a.AGC 00~3FAuto Gain Control.

b.AFT 00~ 7FAuto Frequency Control

c.H-SHFT00~ 3FHorizontal Position shift

d.V-SHFT 00~ 3FVertical Position shift.

e.V-AMPL 00-3FVertical Amplitude shift.

f.V-SLOP 00~ 3FVertical Symmetry alteration.

g.V-DLY 00-CFVIDEO Delay.

h.GAIN R 00~ 3FRed Gain.

i.GAIN G 00-3FGreen Gain.

j. GAINB00-3FBlueGain.

k.NVM Access to NVM memory.

6.For"a"thru j selections.

Adjustment to a selection can bemadebypressing buttons

Acolour barisdisplayed on the OSDto indicate the adjustment position, together with hexadecimal numbers (Notfor

Giladjustment).

For"k"Selection.

NVM storage locationsettings variants.

Inorder to have access to the desired storage location,buttons

ahigheror lower location,respectively. Bearinmindthat, forstorage locationindicationa hexadecimal numerical system

isused, instead of a decimal system.

0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F,

10,

11,

.........19,

1A,

1B,

1C,

1D,

1E,1F,

20,

21,..........99,9A, 9B,9C,9D,9E,

9F,

AO,

A1,

..........

BO,..........

CO,

..........

DO,

..........

EO,

..........

FO,

F1,

F2,

F3,

F4,

F5,

F6,

F7,F8,

F9,FA, FB,FC,

FD,

FE,FF.

Fromthe lastlocationFFtothefirst 00can bereached byincreasing andfromfirstto lastbydecreasing. Once the storage

locationto bevaried hasbeenselected, itsvaluecan bemodified bythe bitsthatform partofthe storage locationnumerical

buttons, numbers [0]to\7\, respectively.Thisswitchesitsbinarynumberfrom andbetween 0 and1 eachtimeone

ofthe buttons isDressed.

37DM-2;

DD(HEX)

DESCRIPTION

RED COLOUR TEMPERATURE

GREEN COLOUR TEMPERATURE

BLUECOLOUR TEMPERATURE

VERTICAL SHIFT

HORIZONTAL SHIFT

VERTICAL AMPLITUDE

VERTICAL SLOPE

LUMADELAY PAL

LUMA DELAY SECAM

S-CORRECTION

AGC

OPTIONS:

INGOSD| AFCHLPAL UHFTJ-OCKAV-F FP

76543210

0:FP:SYSTEM B/G(0) - B/G+L,MESSAGE RECHERCHE (1)

1:AVFRONTAL: NOTINCLUDED (0) , INCLUDED (1)

2:TUNING LOCK (HOTEL): LOCKED+SWITCH-ON PR1 (1),NOLOCKED (0)

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

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

5:CHILD LOCK: CHILD LOCK ACTIVE (1)CHILDLOCKNOACT (0)

6:AUTO FIRST: TUNING FIRST MENU:AUTO (1)MANUAL (0)

7:INGOSD:OSDJNGLES (1)OSD-SYMBOL (0)VALUE=60H

AFT ADJUSTMENT VALUE (B/G, L SYSTEMS)

AFT ADJUSTMENT VALUE (L'SYSTEM)

MAXIMUM VOLUME LIMIT

FIRM

RED COLOUR TEMPERATURE

GREEN COLOUR TEMPERATURE

BLUECOLOUR TEMPERATURE

VERTICAL SHIFT

HORIZONTAL SHIFT

VERTICAL AMPLITUDE

VERTICAL SLOPE

LUMA DELAY PAL

LUMADELAY SECAM

S-CORRECTION

AGC

OPTIONS:

INGOSDAFCHLPALUHFTLOCKAVFFP

0:FP:SYSTEM B/G(0)- B/G+L,MESSAGE RECHERCHE (1)

1:AV FRONTAL: NOTINCLUDED(0), INCLUDED (1)

2:TUNING LOCK(HOTEL): LOCKED+SWITCH-ON PR1 (1),NOLOCKED (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 LOCKNOACT (0)

6:AUTO FIRST:TUNING FIRST MENU: AUTO (1)MANUAL (0)

7:INGOSD:OSDJNGLES (1)OSDSYMBOL(0)VALUE==60H

AFT ADJUSTMENT VALUE (B/G, L SYSTEMS)

AFT ADJUSTMENT VALUE (LSYSTEM)

MAXIMUM VOLUME LIMIT

FIRM

RED COLOUR TEMPERATURE

GREEN COLOUR TEMPERATURE

BLUECOLOUR TEMPERATURE

VERTICAL SHIFT

HORIZONTALSHIFT

VERTICAL AMPLITUDE

VERTICAL SLOPE

LUMA DELAY PAL

LUMA DELAY SECAM

S-CORRECTION

AGC

OPTIONS:

INGOSDAFCHLPAL UHFTLOCKAVFFP

76543210

0:FP:SYSTEM B/G(0)- B/G+L,MESSAGE RECHERCHE (1)

1:AVFRONTAL: NOTINCLUDED (0), INCLUDED (1)

2:TUNING LOCK (HOTEL): LOCKED+SWITCH-ON PR1(1),NOLOCKED(0)

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

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

5:CHILD LOCK:CHILDLOCKACTIVE (1)CHILDLOCKNOACT (0)

6:AUTO FIRST: TUNING FIRST MENU:AUTO (1)MANUAL (0)

7:INGOSD:OSDJNGLES (1)OSDSYMBOL(0)VALUE=60H

AFT ADJUSTMENT VALUE (B/G,L SYSTEMS)

AFT ADJUSTMENT VALUE (LSYSTEM)

MAXIMUM VOLUME LIMIT

FIRM

TABLE LONG

FIRM

AGING ON. AUTOMATIC SWITCH ON.

SWITCH ONDELAY TIME

37DM-23

VOLUME

CONTRAST

COLOUR

BRIGHTNESS

PEAKING (RANGE: 0-3FH)

ACTUAL PROGRAMM

TV STATE ON/OFF

HUE

CONTRAST (FACTORY PRESET)

COLOUR (FACTORY PRESET)

BRIGHTNESS (FACTORY PRESET)

PEAKING (RANGE: 0-3FH)(FACTORY PRESET)

ONTIMER LAST VALUE

OFFTIMER LAST VALUE

OSD STATE BIT0:PICTURE NORM ON/OFF

BIT1:SCART/AV LOCKED

BIT2:FRONTAL LOCKED

BIT3:ROW 8/30 PERM.(RESERVED-PROG. INTERNALLY)

BIT4: PINNUMBER OPTION (0-NOT APPEAR, 1-APPEAR)

BIT5:CLOCK STATE (PROGRAMMED INTERNALLY)

BIT6:ELIMINATE VERTICAL WHITE BARS INMENUS

BIT7:(1)REALTIMER+ ALARM / ( 0)ONTlMER

VALUE=51H

BKGD USER'S CORRECTION (NOT USED INTHIS MODEL)

BKGD USER'S CORRECTION PRESET VALUE (NORMALIZED) (")

VOLTAGE LIMITBETWEEN L'-L SYSTEM (MSB)

VOLTAGE LIMITBETWEEN L'-L SYSTEM (LSB)

HORIZONTAL OSD OFFSET

BIT7:DIRECTION SIGN:(0)INCREASE (1)DECREASE

BIT6:DON'TCARE

BIT5 - BIT0:OFFSET VALUE

PROG SEARCH SPEED ALL BAND -HIGH NIBBLECMPLEMENTED-

PROG SEARCH SPEED (VHL BAND) -HIGH NIBBLECMPLEMENTED-

PROG SEARCH SPEED (VHH BAND) -HIGH NIBBLECMPLEMENTED-

CHANNEL RANGE INFACTORY AUTOINSTALL

PASSWORD ON(1)/OFF (0)

PASSWORD FIRST DIGIT

PASSWORD SECOND DIGIT

PASSWORD THIRD DIGIT

PASSWORD FOURTH DIGIT

FREE

•

37DM-23SC

61-FF

100-18Dh

OSDWORD 1:BIT0:OSD PROG SIZE.0=LARGE

1=SHORT

BIT1 :OSDPROG DISPLAYED TIME.

0=SHORT TIME / 1 = LONGTIME

RED REFERENCE FORAUTO BKGD ADJUSTMENT

GREEN REFERENCE FORAUTO BKGD ADJUSTMENT

BLUEREFERENCE FORAUTO BKGD ADJUSTMENT

CONTROL2:OSO,VSD,CB,BLS,BKS,CS1,CSO,BB

CONTROL3:HOB,BPS,ACL,CMB,AST,CL2,CL1,CLO

VERTICAL ZOOM APPROX.

VERTIVAL SCROLL APPROX.

CONTROL0:INA, INB,INC,CCC-D, FOA,FOB,XA,XB

CONTROL,-!: FORF, FORS, DL,STB, POC, CM2, CM1,CMO

CONTROL5:EVG, HCO,LBM, VID, STM, NCIN,VIM, AKB

CONTROL6:IFS,AFW,IE1,COR, RBL,MAT, PRD,SBL

CONTROL7:EVSINC, EBS, FFI,HBL,GAI, IE2,DS,DSA

NOTUSED

PROGRAMS (0-52)

PROGRAMS (53-99)

(14")

(21-)

VALUE= 9AH

VALUE= 24H

VALUE-ODH

VALUE= 20H

VALUE=1AH

VALUE=COH

VALUE=26H

VALUE=3CH

VALUE=OOH

PIF/AGCAdjustment Screen Adjustment

1.VCO + AFT Adjustment 3.Focus Adjustment

1.Connect the output of SSG (Standard Signal Gen-

erator) to the tuner IFoutput terminal.

•SSG output: 38.9MHz (CW) ±5kHz).

•SSG output level: approx. 90dB^iV.

2.Enter into Service Mode.

3.Push CH A until AFT appears.

4. Press 0-nbutton on R/C. Setting ismadeautomati-

cally. During this setting the colour bar shall go from

redto yellow. When setting isfinished, colour bar

disappears andB-STOP (bus stop) isshown on

screen.

5. Switch set OFFand ONagain,setting isnow memo-

rized.

1.Receivethe"COLOURBAR"signal (Channel E-12).

•Signal strength: 60dB|AV.

2.Enter intoService Mode.

3.Push CH A untilAGC appears.

4.Press Onbuttonon R/C. Setting ismadeautomati-

cally.During this setting the colour barshall gofrom

redto yellow. When setting isfinished, colour bar

disappears andB-STOP (bus stop) isshown on

screen.

5.Switch setOFFandONagain,settingisnowmemo-

rized.

2.RF-AGC Cut-in Adjustment (I2CBUS)

4.G2 Adjustment

1.Apply mains voltage of 220 V AC/50 Hzto TV.

2. Receive Phillips pattern signal to a level between 60

and80dBj^V.

3.Set contrast to 10/10,brightness to 5/10and colour

0/10.

4.Adjust focus potentiometer to obtain maximum defi-

nition.

1.Apply mainsvoltage of 220 V AC/50 Hzto TV.

2.Receive MONOSCOPE PATTERN signal to a level

between 60and 80dB^V.

3.Enter into Service Mode.Press the TEXT key of R/C

andset to level.

4.Set to the point where the raster disappearsonthe

screen VR of FBT.

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