Read Sharp 56FW-53H (serv.man15) Service Manual online
Colour Television – DA100/DW100 Chassis
Sharp Electronics (UK) Ltd
Technical Support
September 99
Contents
POWER SUPPLIES...........................................................................................................................1
Switch Mode Power Supply......................................................................................................1
Start up operation...........................................................................................................1
Voltage regulation ..........................................................................................................2
Over-voltage Protection..................................................................................................2
Over-current control .......................................................................................................2
Voltage regulation ..........................................................................................................2
Over-voltage Protection..................................................................................................2
Over-current control .......................................................................................................2
Slave Processor Power Supply.................................................................................................3
Degauss Circuit........................................................................................................................4
5v Regulator ............................................................................................................................5
Degauss Circuit........................................................................................................................4
5v Regulator ............................................................................................................................5
DA100 (59ESD7H and 66ESD7H) 4:3 chassis................................................................5
DW100 (56FW53H to 6FW54H) 16:9 chassis .................................................................6
DW100 (56FW53H to 6FW54H) 16:9 chassis .................................................................6
CLASS D OUTPUT STAGES ............................................................................................................7
Tda7480 Pin Functions.............................................................................................................7
Pin 9 – Frequency ..........................................................................................................7
Pin 12 – Mute/Standby function ......................................................................................7
Pin 12 – Mute/Standby function ......................................................................................7
Audio Output............................................................................................................................8
Field Output .............................................................................................................................9
Field Output .............................................................................................................................9
Vertical Fly-back...........................................................................................................10
VIDEO AND SYNC PROCESSOR ...................................................................................................11
Description.............................................................................................................................11
Analogue front-end.......................................................................................................11
Input Selector ...............................................................................................................11
Clamping......................................................................................................................11
Automatic Gain Control ................................................................................................12
Analogue-to-Digital Converters.....................................................................................12
Digitally Controlled Clock Oscillator ..............................................................................12
Analogue Video Output ................................................................................................12
Average Beam Current Limiting....................................................................................12
Protection Circuitry .......................................................................................................12
Scan Velocity Modulation Output ..................................................................................12
Input Selector ...............................................................................................................11
Clamping......................................................................................................................11
Automatic Gain Control ................................................................................................12
Analogue-to-Digital Converters.....................................................................................12
Digitally Controlled Clock Oscillator ..............................................................................12
Analogue Video Output ................................................................................................12
Average Beam Current Limiting....................................................................................12
Protection Circuitry .......................................................................................................12
Scan Velocity Modulation Output ..................................................................................12
PICTURE ROTATION......................................................................................................................13
SCAN VELOCITY MODULATOR ....................................................................................................14
LINE OUTPUT STAGE....................................................................................................................15
East West Circuit....................................................................................................................16
Circuit Description ........................................................................................................16
MICROPROCESSOR CONTROL ....................................................................................................17
Reset .....................................................................................................................................18
PROTECTION .................................................................................................................................19
Microprocessor.......................................................................................................................19
Audio Output ................................................................................................................19
Beam Current...............................................................................................................19
Horizontal Mute ............................................................................................................19
Beam Current...............................................................................................................19
Horizontal Mute ............................................................................................................19
Video/Sync Processor ............................................................................................................20
Safety ..........................................................................................................................20
Vprot ............................................................................................................................20
Vprot ............................................................................................................................20
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