Sharp 37DT User manual

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
1-2
1-3
1-4
1-5
2
TINS-6586BMNO
CCABA1229BMVO
HBDGB1017BMSB
HDECQ0035BMSA
HDECQ0036BMSA
JBTN-1046BMSA
JBTN-1047BMSA
GCABB1067BMKA
*
S
S
S
S
S
S
S
S
DESCRIPTION
Operation Manual
FrontCabinet
BadgeSHARP
Window power
Window R/C
Button,Power
Button,Up/Down
RearCabinet
CODE
EX
AP
AX
AC
AB
AB
AB
AD
AU
CODE
SP
AG
AQ
AB
AA
AA
AA
AB
AM
SHARP

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.
2

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.
3

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)
00
01
02
03
04
05
06
07
08
09
OA
OB
OC
OD
OE
OF
10
11
12
13
14
15
16
17
18
19
1A
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
5

1B
1C
1D
1E
1F
20
21
22
23
24
25
26
27
28
29
2A
2B
2C
2D
2E
2F
30
31
32
33
OPTIONS:
INGOSDAFCHLPALUHFTLOCKAVFFP
7 6 5 4 32 1 0
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
34
35
36
37
38
39
3A
38
3C
3D
3E
3F
40
41
42
43
44
45
.
46
47
48
49
4A
4B
4C
4D
4E
4F
50
51
52
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 (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
i
•

37DM-23SC
53
54
55
56
57
58
59
5A
5B
5C
5D
5E
5F
60
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.
8

•GEOMETRY ADJUSTMENT PROCEDURE
1.H-SHFT
a)Receive Philipspattern signal.
b)When </\ button ispressed, picture moves to the left.
c) When <Vbuttonispressed, picture moves to the right.
d)Adjust the horizontal locationto obtain picture centering (fig. 1)
2.V-SHFT
a) Receive Philipspattern signal.
b)When </\ button ispressed, picturemovesup.
c)When <V button ispressed, picture moves down.
d)Adjust the horizontal location to obtain picture centering (fig. 2)
3.V-AMPL
a)Recive Philipspattern signal.
b)When </\button ispressed, vertical size of picture increases.
c)When <Vbuttonispressed, vertical size of picture decreases.
d)Adjust the vertical size to obtain overscan (fig. 3).
4.V-SLOP
a)Receive Philipspatternsignal.
b)When </\button ispressed, upper picture scanning decreases and
.lower picture scanning increases.
c)When <V button ispressed, upperpicturescanningincreases and
lower picture scanning decreases.
d)Adjust the vertical symmetry to obtain symmetrical scanning between
upperandlower picture(fig. 4).
COLOUR ADJUSTMENT
5.V-DLY
a)Receive Philipspattern signal.
button ispressed, lumaphase delays.
button ispressed, chroma phase delays.
b)When
c)When
d)Adjust the chroma-luma delay.
Thefollowing adjustments are only required when thePicture Tube ischanged.
6."GAIN R","GAIN G", "GAIN B".
a)Adjust G2.
b)Tune inwhite card.
c)Adjust colour to minimum.
d)Position colourmeter inthe center ofscreen.
e)Usingbrightness and contrast buttons, selecta luminanceof120nits.
f) Operate again inService Mode and select location GAIN R,GAIR B to obtain colour coordinates:
X= 0.290 ±0.015
Y= 0.284 ±0.015
g)Exit Service Mode andcheck colour coordinates 'X' and 'Y' at20and 120NITS. Itmay be necessary to repeat
procedure.
NOTE:
Locations: GAIN R alter 'X'coordinate; GAIN G alter the 'Y' coordinates; GAIN B alterthe 'X' and"/'coordinates.

•CHILD LOCK CANCEL
The following process describes howto cancelactualpassword(PIN)when thecustomerforgets code.
1SwitfhONTVSet-
2,Press butter on TV and°TIon R/Csimultaneously.
3.Press MENU button on R/C to inputmenu.
4.Using buttons move to o-nposition.
5.Press MENU button again.
6.Select PINand inputnew PIN(Please donotforget it)
7.SelectEXITandpressMENUbuttonagain.
SOLID STATE DEVICE BASE DIAGRAM
RH-TX0102BMZZ RH-TX0108BMZZ RH-TX0128BMZZ VS2SA1037KQ-1
RH-TX0104BMZZ RH-TX0112BMZZRH-TX0141BMZZ VS2SC2412KQ-1
RH-TX0105BMZZ RH-TX0118BMZZRH-TX0141BMZZ (SMDCOMPONENT)
RH-TX0142BMZZ RH-TX0131 BMZZ
RH-TX0130BMZZ RH-TX0181 BMZZ
RH-TX0180BMZZ
10

37DM-23SC
DESCRIPTION OF SCHEMATIC DIAGRAM
SAFETY NOTE:
1.DISCONNECTTHE AC PLUG FROM THE AC
OUTLET BEFORE REPLACEING PARTS.
2. SEMICONDUCTOR HEAT SINKS SHOULD
BE REGARDED AS POTENTIAL SHOCK
HAZARDS WHEN THE CHASSIS IS OPER-
ATING.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH "A" ( )
ARE IMPORTANT FOR MAINTAINING THE
SAFETY OF THE SET. BE SURE TO REPLACE
THESE PARTS WITH SPECIFIED ONES FOR
MAINTAINING THE SAFETY AND PERFORM-
ANCE OF THE SET.
NOTE:
1.The unit of resistance"ohm" isomitted
(K=1000 ohms, M=Magaohm).
2. All resistors are 1/8watt, unless otherwise
noted.
3.AllcapacitorsareU.F,unlessotherwisenoted
(P=^F).
4. The capacitor with PartNo.RC-FZ9XXXBMNJ
isdesignedtowithstand63V.
WAVEFORM MEASUREMENT
CONDITIONS:
Colour bar generator signal of 70dBfrom RF
input.
SERVICE PRECAUTION:
THE AREA ENCLOSED BY THIS LINE (• • )
IS DIRECTLY CONNECTED WITH AC MAINS
VOLTAGE.
WHEN SERVICING THE AREA, CONNECT AN
ISOLATING TRANSFORMER.
BETWEEN TV RECEIVER AND AC LINE TO
ELIMINATE HAZARD OF ELECTRIC SHOCK.
CAUTION:
This circuit diagram isoriginalone, therefore
there may bea slight difference from yours.
14