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
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