Sharp 37DM-23H Specifications

SHARP ELECTRONICS (UK) LIMITEDCA1/CA10 Chassis Course Notes

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 5Figure 3 : Mains Rectifier CircuitD701, D702, D703 and D704 full wave

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 6Figure 4 : Power Supply Waveforms

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 7Figure 5 : CA10 Power Supply - Non-isolated Side

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 8Figure 6 : Power Supply Regulation Circuit - Secondary SideVoltage regu

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 9will allow Q704 to conduct more and the LED will become brighter.As th

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 10Over current controlOver current control is performed by monitoring th

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 11When the magnetic field within T701 collapses, the back emf generated

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 12Primary ProcessorAs described previously, to control the operation of

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 13System ControlResets and oscillatorsWhen the power supply starts up t

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 14Data communicationWithin the CA10 chassis, there are a number of data

ContentsIntroduction to the CA10 Chassis ... Page 1CA10 Receiver Specifications ...

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 15Protection circuitsThere is a protection input on IC101, pin 77 ( PRO

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 16Line StageLine signal generation is carried out within IC201, with syn

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 17Once IC201 has detected a feed back pulse, it will switch the line dr

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 18Line output circuit descriptionTo enable enough emf to be generated by

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 19Figure 18 : Line Current and Voltage Waveforms ( Idealised )Note that

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 20Figure 19 : Sand Castle PulseFigure 20 : Sand Castle Pulse DetailR625

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 21East/West correctionPrinciple of circuit operationIf the width of the

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 22top of this capacitor will be in excess of 160V peak. The start point

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 23Figure 24 : Diode Modulator CircuitThe obvious advantage of this circ

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 24Supplies generated by the line stageA number of conventional supplies

Tuner and IF ... Page 31Tuner and IF processing ...

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 25Beam current limiterBeam current limiting is carried out to remove th

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 26The signal on pin 22 is a pulse ( at vertical rate ) sitting on a DC p

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 27Vertical StageVertical time base generationA R/C oscillator within IC

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 28Figure 29 : Vertical Drive CircuitVertical scan coil drive circuit

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 29The vertical output stage used in the CA10 chassis is based around tw

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 30Figure 30 : Vertical Output StageTuner and IF

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 31Tuning and IF control is provided by the system microprocessor, IC 10

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 32this is provided from the +150 volt line via the dropper resistors R21

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 33into two paths. The first path goes into the base of Q203 via the a

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 34Figure 33 : Spectrum of the Base Band SignalEach signal path from IC20

Vertical Driver Stage ... Page 56Vertical Output Stage ... Pa

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 35RF AGC operationAs signals received from off air transmissions can va

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 36Audio ProcessingIn the current range of models fitted with the CA10 ch

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 37Note that SRS is provided on some models ( 51DS05H, 59DS05H and 66DS0

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 38Sound Retrieval System ( SRS )In the current range of models fitted wi

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 39Video ProcessingIC201 provides the majority of the signal processing

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 40Signal sources and switchingVideo signals can either be obtained from

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 41RGB SwitchingFigure 38 : RGB Input and Switching CircuitIt is possibl

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 42TeletextTeletext processing is carried out within IC106 ( STV5346 ).

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 43CRT drive circuitDrive for the CRT cathodes is provided on the CRT ba

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 44Indicating DevicesFigure 41 : Stereo and OPC LED Drive CircuitThere ar

FiguresFigure 1 : Overall Block Diagram of the CA10 Chassis ... Page 3Figure 2 : Mains Filter and Indicator Circuit ...

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 45Practical Fault FindingI C bus line disconnection2It is possible to i

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 46Power supply voltage line resistances to earthSome times it is necessa

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 47Introduction to the CA1 ChassisAs the CA10 chassis is designed for use

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 48CA1 Receiver SpecificationsFeatures 37DM23H 37DT25H 51DT25HTube Size (

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 49Block Diagram of the CA1 ChassisA block diagram of the CA1 chassis is

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 50CA1 Power SupplyThe power supply used in the CA1 chassis is very simila

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 51the base of a control transistor. The collector of this transistor wi

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 52CA1 ResetWhenever the receiver is switched on from the mains ( on/off b

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 53Data CommunicationFigure 46 : CA1 Data CommunicationTo enable the rece

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 54CA1 Power On ControlDuring the stand by mode, IC1001 ( main microproces

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 1Introduction to the CA10 ChassisAs with the last Sharp colour televisi

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 55CA1 ProtectionFigure 48 : CA1 Protection CircuitUnlike the CA10 chassi

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 56CA1 Discrete Component Vertical StageUnlike the CA10 chassis, the verti

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 57Vertical Output StageFigure 50 : CA1 Vertical Output StageVertical dri

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 58being a pulse which is used for the flyback generation.At the collector

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 59CA1 Line StageWithin this chassis, the line driver stage does not use

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 60primary winding of the line output transformer.A pulse is fed back from

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 61CA1 CRT Drive AmplifierUnlike the CA10 chassis, the CA1 does not use a

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 62CA1 Audio Output AmplifierTo enable the CA1 chassis to reproduce audio

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 63CA1 Service Set Up ModeTo adjust the preset values contained within th

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 64CA1 Non Volatile Memory CodesAll user setting are contained within the

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 2CA10 Receiver SpecificationsThe table below lists all of the current ra

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 6517 Luminance Delay - PAL18 Luminance Delay - SECAM19 S-Correction1A Au

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 6632 Aging on. Automatic Switch on33 Switch on Delay Time34 Volume Setti

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 674E Password First Digit4F Password Second Digit50 Password Third Digit

CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 68Binary code 1 0 1 0 0 1 0

CA1/CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 69Future DevelopmentsSharp are currently developing two wide screen

CA1/CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 70Faults

CA1/CA1 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 71Notes

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support Group Page 3CA10 Block DiagramTo give an overview of the CA10 Chassis, the block d

CA10 Course NotesSharp Electronics (UK) LimitedCE Technical Support GroupPage 4This self running switched mode power supply is based around a single f