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Sharp CA1/CA10 Chassis Course Notes

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Content Preview
SHARP ELECTRONICS
(UK) LIMITED
CA1/CA10 Chassis
Course Notes

Contents
Introduction to the CA10 Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 1
CA10 Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
CA10 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
Mains input circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
Standby operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Start up operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Voltage regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Supply increase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Supply decrease . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
Over current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
Snubber circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
Power on control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Primary processor power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Power supply turn on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Primary Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
System Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
Resets and oscillators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
Data communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
I2C bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
Parallel communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
Protection circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Software reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Line Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16
Line time base generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16
Line drive circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16
Line output circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Line scan correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19
Sand castle pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 19
East/West correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Principle of circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Circuit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Pulse width modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Supplies generated by the line stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 24
Beam current limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Beam limiting input of IC201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Vertical circuit failure - CRT protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
EHT input of IC201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
Vertical Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
Vertical time base generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
Vertical scan coil drive circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 29

Tuner and IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31
Tuner and IF processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31
Automatic frequency control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 32
Tuning features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 32
IF signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 33
Audio IF processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 34
Video IF and signal processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 34
RF AGC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
Automatic tuning operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Signal sources and generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 37
Signal switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 37
Loudspeakers driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 37
Sound Retrieval System ( SRS ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 38
Headphone driver stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 38
Video Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 39
Signal sources and switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 40
RGB Switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 41
Teletext . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 42
On screen display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 42
CRT drive circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 43
Indicating Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 44
Practical Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
I2C bus line disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
Tuner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
IC201 ( IF, Y/C processor and time base generator ) . . . . . . . . . . . . . . . . . Page 45
IC305 ( Sound processor ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
SRS module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
Shorting of SDA to SCL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
Disconnection of IC703 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 45
Power supply voltage line resistances to earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Service Set Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Access and operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Vertical adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 46
CA1 Receiver Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 48
CA1 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 50
Regulation Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 50
IC201 Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 51
CA1 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 52
Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 53
CA1 Power On Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 54
CA1 Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 55
Automatic Beam Current Limiting and X-Ray Protection . . . . . . . . . . . . . . . . . . . . . Page 55
CA1 Discrete Component Vertical Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 56

Vertical Driver Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 56
Vertical Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 57
Frame Scanning Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 58
CA1 Line Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 59
Driver Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 59
CA1 CRT Drive Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 61
CA1 Audio Output Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 62
CA1 Service Set Up Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 63
CA1 Non Volatile Memory Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 64
CA1 NVM Locations and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 64
Procedure for Programming the NVM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 67
NVM Programming Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 68
Future Developments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 69
Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 70
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 71
Produced by
Sharp Electronics (UK) Limited
CE Technical Support
Sharp House
Thorp Road
Newton Heath
Manchester
M40 5BE
Copyright © Sharp Electronics CE Technical Support Group November 1997

Figures
Figure 1 : Overall Block Diagram of the CA10 Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 3
Figure 2 : Mains Filter and Indicator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 4
Figure 3 : Mains Rectifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
Figure 4 : Power Supply Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 6
Figure 5 : CA10 Power Supply - Non-isolated Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 7
Figure 6 : Power Supply Regulation Circuit - Secondary Side . . . . . . . . . . . . . . . . . . . . . . . . Page 8
Figure 7 : Current Regulation Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
Figure 8 : Snubber Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
Figure 9 : Primary Processor Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 11
Figure 10 : Primary Side Microprocessor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 12
Figure 11 : Reset Operation Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
Figure 12 : Reset Pulse Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
Figure 13 : Data Communication of IC101 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
Figure 14 : Audio Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 15
Figure 15 : Block Diagram of Line Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 16
Figure 16 : Line Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 17
Figure 17 : Line Output Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 18
Figure 18 : Line Current and Voltage Waveforms ( Idealised ) . . . . . . . . . . . . . . . . . . . . . . . Page 19
Figure 19 : Sand Castle Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Figure 20 : Sand Castle Pulse Detail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Figure 21 : Sand Castle Pulse Generation Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
Figure 22 : IC502 Ideal Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 21
Figure 23 : Idealised East/west Pulse Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
Figure 24 : Diode Modulator Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23
Figure 25 : East/West Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 23
Figure 26 : Beam Current Limiter Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Figure 27 : Signal Present on Pin 22 ( BLIM ) of IC201 . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
Figure 28 : Vertical Stage Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 27
Figure 29 : Vertical Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
Figure 30 : Vertical Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 30
Figure 31 : Tuner and IF Signal Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31
Figure 32 : Video/Audio IF Split . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 33
Figure 33 : Spectrum of the Base Band Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 34
Figure 34 : Automatic Gain Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
Figure 35 : Audio Stage Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 36
Figure 36 : Headphone Amplifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 38
Figure 37 : Video Switching circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 39
Figure 38 : RGB Input and Switching Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 41
Figure 39 : Teletext Processor Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 42
Figure 40 : CRT Drive Amplifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 43
Figure 41 : Stereo and OPC LED Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 44
Figure 42 : Overall Block Diagram of the CA1 Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 49
Figure 43 : CA1 Voltage Regulation Feed Back Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 50
Figure 44 : IC201 Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 51
Figure 45 : CA1 Reset Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 52
Figure 46 : CA1 Data Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 53
Figure 47 : CA1 Power On Control Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 54
Figure 48 : CA1 Protection Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 55
Figure 49 : CA1 Vertical Driver Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 56
Figure 50 : CA1 Vertical Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 57
Figure 51 : CA1 Vertical Scanning Coils Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 58
Figure 52 : CA1 Line Driver Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 59
Figure 53 : CA1 CRT Drive Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 61
Figure 54 : CA1 Audio Amplifier Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 62

CA10 Course Notes
Introduction to the CA10 Chassis
As with the last Sharp colour television chassis ( CS ) the new CA10 design incorporates the latest
technology from Japan and Spain where the receivers are designed and manufactured at the production
plant in Barcelona.
Once again the reliable switched mode power supply, based around a field effect transistor, is used to
provide power for the operation of the set. This has changed little since the CS chassis, but a detailed
explanation of its circuit operation is given in the following pages.
Extensive use is made of dedicated integrated circuits and the number of surface mounted IC’s is kept
to a minimum to maintain an easier level of serviceability. The majority of IC packages are of the dual
in line type. A break down of the major IC’s explaining their basic functions is outlined below.
IC101 is the only large surface mounted IC and provides overall system control.
IC104 stores all the user information such as tuning and picture settings as well as geometry
and CRT drive characteristics. This is an eight pin surface mounted device
IC105 is the EPROM, which contains the program to run the main system microprocessor.
IC106 ( STV5346 ) is a single chip teletext decoder/processor whose output is at RGB levels.
This
is a 28 pin surface mounted device.
IC201 ( TDA8844 ) provides the time base generators ( line and frame ), IF stage, majority of the
Y/C processing and video switching ( including RGB ).
IC304 ( M5218L ) is the headphone amplifier.
IC305 ( MSP3410D ) provides all the audio signal processing requirements, including decoding,
volume control and signal switching.
IC401 ( HEF4053 ) provides for video switching ( including the Y and C signals ).
IC702 provides primary power supply on/off control and communication with the main system
processor for key scan and remote control functions. It also controls the receivers self timer
operation.
IC901 ( TDA6107Q ) drives the CRT.
Note that IC101 and IC702 are produced by Sharp and therefore can only be obtained through the Sharp
Spare Parts Centre. IC104 and IC105 are generally available, but contain programs and therefore must
also be obtained direct from Sharp Spare Parts Centre.
As the tuner is directly controlled by the I2C bus it enables direct channel entry and stable control of the
tuning and AFT functions. By receiving controlling inputs from IC201 ( IF processor ) and IC106 ( teletext
processor ) the main system processor can carry out automatic tuning and sorting.
Various audio inputs can be used to generate either mono, stereo or SRS ( Sound Retrieval System )
sound, depending on receiver specification - see next page for model specifications. Output from the top
of the range receiver is 2 x 20W ( MPO ) and an additional 20W from the external sub-woofer. As the
audio signal is controlled by the data bus, it is possible to have separate control of both loudspeaker and
headphone outputs.
Video switching from a number of sources is possible, this includes RGB from a rear SCART socket and
S-VHS from the rear AV SCART socket.
All of the above contribute to make a reliable and easily repairable television chassis, that is fitted into
all of the new Sharp range of large screen television receivers as listed on the following page.
Sharp Electronics (UK) Limited
CE Technical Support Group
Page 1

CA10 Course Notes
CA10 Receiver Specifications
The table below lists all of the current range ( as of January 1998 ) of Sharp television receivers utilising
the CA10 chassis. Note that the receivers featuring a sub-woofer will have an extra drive PWB fitted and
the SRS models will have the SRS sound processing sub PWB fitted.
Features
51DS02H
51DS03H
51DS05H
59DS03H
59DS05H
66DS03H
66DS05H
Tube Size ( inches )
21
21
21
25
25
28
28
Visible Screen ( cm )
51
51
51
59
59
66
66
Tube Type
B Matrix
B Matrix
B Matrix
B Matrix
B Matrix
B Matrix
B Matrix
Number of Pre-sets
99
99
99
99
99
99
99
Auto Sort
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Fast Text
Yes
Yes
Yes
Yes
Yes
Yes
Yes
NICAM
Yes
Yes
Yes
Yes
Yes
Yes
Yes
SRS/3D Sound
-
-
Yes
-
Yes
-
Yes
AI-OPC
-
-
Yes
-
Yes
-
Yes
On/Off Timer
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Rear S-VHS Input
-
-
Yes
-
Yes
-
Yes
21 Pin Euroscart
2
2
2
2
2
2
2
Ext Speaker Output
-
-
-
-
S Woof
-
S Woof
Power Output ( MPO )
2x4
2x10
2x10
2x10
2x10+20
2x10
2x10+20
Headphone Jack
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Stand
Yes
Yes
Yes
Yes
-
Yes
-
Cabinet
-
-
-
-
Yes
-
Yes
Width ( mm )
539
612
612
695
695
740
740
Height ( mm )
468
458
458
537
537
566
566
Depth ( mm )
484
492
492
431
431
470
470
S/B Power
3W
3W
3W
3W
3W
3W
3W
Note :
Sharp reserve the right to make design and specification changes for product improvement.
The performance specification figures are nominal values of production units. There may be some
deviation from these figures in individual units.
To complete this range of television receivers, the CS chassis is used for the Dolby Pro-logic models
59CSD8H and 66CSD8H.
Sharp Electronics (UK) Limited
Page 2
CE Technical Support Group

CA10 Course Notes
CA10 Block Diagram
To give an overview of the CA10 Chassis, the block diagram shown below represents a pictorial view
of the receiver and its individual components.
16
Figure 1 : Overall Block Diagram of the CA10 Chassis
Power Supply
Sharp Electronics (UK) Limited
CE Technical Support Group
Page 3

CA10 Course Notes
This self running switched mode power supply is based around a single field effect transistor, Q701 and
generates the following supplies for use in various parts of the receiver. Note that other supplies are
generated by the line stage and are covered in the Line Stage section of these notes.
Supply
Purpose
Point of Generation
+18V
Audio and frame output amplifiers
D718, pin 8 of T701
-18V
Audio and frame output amplifiers
D719, pin 8 of T701
+150V
Line output, CRT drive amplifier and VT line
D720, Pin 4 of T701
generation
+13V
Source of +8V supply
D711, pin 5of T701
+8V
IC201 supply
IC706
+7V
Source of STB5V and 5V
D722, pin 1 of T701
STB5V
Supply for IC101/2/5/6
Q706
+5V
Supply for IC305, tuner
Q707
Note : The voltages attributed to the rails on the circuit are not necessarily the measured voltage. See
the Power supply voltage line resistances to earth section of these notes for actual measured
voltages and nominal cold resistances to ground.
Mains input circuit
Figure 2 : Mains Filter and Indicator Circuit
From the mains plug ( fitted with a 3A fuse ), the mains passes into the set via connector GN0304 and
into the fuse, F701 ( 3.15A anti-surge ). After the mains switch, S701, the mains applied indication neon
is connected across the live and neutral lines via R701 and R702. From this point the mains is fed to
the de-gauss circuit, via L701 and the positor POR701, undesirable spikes generated by the de-gause
operation, are removed by C702. Choke L701 provides further noise suppression. After L701 the mains
is also sent to the standby control circuit. Finally, after passing through L702 and L703, the mains is
supplied to the bridge rectifier.
Sharp Electronics (UK) Limited
Page 4
CE Technical Support Group

CA10 Course Notes
Figure 3 : Mains Rectifier Circuit
D701, D702, D703 and D704 full wave rectify the incoming mains and this rectified voltage is smoothed
by C705. The resultant 320VDC is now fed to the switched mode power supply.
D705 is used to limit possible damage caused to the bridge rectifier from internally generated noise that
could come close to the PIV of the diodes. Note that in some versions of the CA10 chassis, this diode
is not fitted.
Standby operation
Because of proposed legislation, which will limit the stand by power consumption, changes have been
made to the operation of the set during the stand by mode. This is achieved by muting the operation
of the power supply in the standby mode so that no oscillation takes place. The operation of the power
supply described below, therefore, relates to when the set is running. How the set comes out of standby
will be covered in the Power on control section of these notes.
Start up operation
Rectified and smoothed mains voltage ( +320VDC ) is used to provide the start up voltage to the gate
of Q701. Current flows via R713 and R714 causing C714 to charge up, the earth return for the capacitor
is via R718 and winding 15/14 of T701. This allows a voltage to be built up on the gate of Q701 ( this
will turn on Q701 when it gets to about four and a half volts ). D712 ensures that the steady DC on the
gate of Q701 does not exceed twelve volts as any voltage higher than this may damage the device.
C712 removes any high frequency pulses that may damage Q701.
As Q701 turns on, current will flow via the bridge rectifier, pins 17 and 12 of T701 and the source/drain
of Q701 finally returning to the bridge rectifier by the earth return resistor, R716. This will induce an emf
into the primary winding of the chopper transformer, which will be reflected by the secondaries via the
magnetic induction within the transformer itself.
The voltage generated by the winding connected between pins 14 and 15 will also increase as the
conduction of Q701 increases. This increase in voltage will cause D716 to conduct when its zener
voltage is reached ( 5.6 volts ). Therefore C713 will start to charge and when the base/emitter voltage
of Q703 reaches 0.65 volts it will conduct and effectively remove the gate supply. Q701 is now turned
off and current ceases to flow in the primary winding of T701 and the emf will start to decay.
As the secondary voltages decay, pin 15 of T701 will go negative and this negative charge is transferred
via C714 to the gate of Q701, holding the FET fully off for a time period decided by the charging rate of
C714 ( via R713/4 ) and the discharge rate of C713 ( via the base/emitter junction of Q703 ). Once the
magnetic field has collapsed totally, the cycle is repeated.
Sharp Electronics (UK) Limited
CE Technical Support Group
Page 5

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