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