76GF-63 (serv.man2). DA100 Repair Notes — Sharp TV Service Manual (repair manual)

Model
76GF-63 (serv.man2)
Pages
80
Size
6.05 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / CTR / DA100 Repair Notes
File
76gf-63-sm2.pdf
Date

View Sharp 76GF-63 (serv.man2) Service Manual online

DA100 (50Hz) and DA50W Chassis – Repair Notes 
 
Page 1 of 80 
 
DA100 (50Hz) and 
DA50W Chassis 
Repair Notes 
 
 
Revision 3 – May 2003 
 
 
Alan van Winkelen 
Sharp Electronics (UK) Limited - May 2003 
 
Revision 3
DA100 (50Hz) and DA50W Chassis – Repair Notes 
 
Page 2 of 80 
Sharp Electronics (UK) Limited - May 2003 
 
Revision 3
Contents 
Contents ..........................................................................................2 
Figures............................................................................................5 
Introduction......................................................................................7 
Product Specifications...........................................................................8 
IC Identification.................................................................................9 
Note 1 – EPROM Types and Versions........................................................................... 10 
FW Models............................................................................................................................................................................... 10 
28HW53H and 32HW53H:.................................................................................................................................................. 10 
GF Models.................................................................................................................................................................................11 
Note 2 - Second NVM Fitting .................................................................................. 11 
Note 3 IC1801 Types ........................................................................................... 11 
Note 4 – IC801 Types........................................................................................... 11 
Dolby Pro Logic PWB............................................................................................. 12 
Power Supply ................................................................................... 13 
Power Supply Lines ............................................................................................... 14 
Circuit Operation ................................................................................................. 15 
Figure 6: Q701 Gate Waveform ................................................................................ 16 
Standby Power Supply ........................................................................................... 17 
Degauss Circuit ................................................................................................... 18 
+5V Supply Generation........................................................................................... 19 
+3.3V Supply Generation ........................................................................................ 19 
Overriding the Power Supply Control ........................................................................... 20 
Power Factor Correction Circuit................................................................................. 21 
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left) ........................... 22 
Faults in the Power Supply ...................................................................................... 23 
High HT....................................................................................................................................................................................23 
No Operation ..........................................................................................................................................................................25 
Other Problems in the Power Supply.................................................................................................................................25 
Horizontal Stage............................................................................... 26 
Focus Modulation (66cm and 76cm models only) ............................................................... 29 
Circuit Operation ...................................................................................................................................................................29 
Faults in the Horizontal Stage .................................................................................. 31 
Horizontal Output Transistor Failure............................................................................................................................... 31 
Horizontal Drive Problems................................................................................................................................................... 31 
Large Picture........................................................................................................................................................................... 31 
East/West Circuit ............................................................................. 32 
Circuit Operation ................................................................................................. 32 
DA100 (50Hz) and DA50W Chassis – Repair Notes 
 
Page 3 of 80 
Sharp Electronics (UK) Limited - May 2003 
 
Control and Communication .................................................................... 50 
Revision 3
Faults in the East/West Circuit................................................................................. 35 
CRT PWB ....................................................................................... 36 
Faults on the CRT PWB.......................................................................................... 36 
Class D Output Stages ........................................................................ 37 
Pins 8 and 9 – Frequency ......................................................................................................................................................37 
Pin 12 – Standby/Mute Control Pin ....................................................................................................................................37 
Vertical Stage ................................................................................. 38 
Circuit Operation ................................................................................................. 38 
Vertical Fly-Back ................................................................................................ 38 
Faults in the Vertical Stage..................................................................................... 42 
Audio ........................................................................................... 43 
On Board Circuit Operation ..................................................................................... 43 
Mute Circuit Operation ........................................................................................................................................................43 
Centre Speaker PWB ............................................................................................................................................................44 
Faults in the Audio Circuit...................................................................................................................................................45 
Dolby Pro-Logic Circuit Operation .............................................................................. 47 
Faults in the Dolby Pro-Logic Circuit ................................................................................................................................49 
Communication Lines.............................................................................................. 50 
Parallel Bus ..............................................................................................................................................................................50 
I2C Bus.....................................................................................................................................................................................50 
M3 Bus......................................................................................................................................................................................50 
Slave ......................................................................................................................................................................................... 51 
Reset In ................................................................................................................................................................................... 51 
Reset Out (1)........................................................................................................................................................................... 51 
Reset Out (2).......................................................................................................................................................................... 51 
Reset Operation .................................................................................................. 51 
Protection - Microprocessor..................................................................................... 52 
Audio Output...........................................................................................................................................................................52 
Beam Current ..........................................................................................................................................................................52 
Horizontal Mute .....................................................................................................................................................................52 
AV Link............................................................................................................ 53 
Faults Connected with the Microprocessor ..................................................................... 53 
EPROM’s and NVM’s.............................................................................................. 54 
Blanking the NVM ................................................................................................ 54 
NVM Programming Jig ........................................................................................... 55 
Video and Synchronisation Processor......................................................... 56 
Analogue Front End .............................................................................................. 56 
Input Selector.................................................................................................... 57 
Clamping........................................................................................................... 57 
Automatic Gain Control .......................................................................................... 57 
DA100 (50Hz) and DA50W Chassis – Repair Notes 
 
Page 4 of 80 
Sharp Electronics (UK) Limited - May 2003 
 
Revision 3
Analogue to Digital Converters .................................................................................. 57 
Digitally Controlled Clock Oscillator ............................................................................ 57 
Analogue Video Output........................................................................................... 57 
Average Beam Current Limiting ................................................................................. 57 
Protection Circuitry .............................................................................................. 57 
Scan Velocity Modulation Output ............................................................................... 58 
Protection – Video/Sync Processor.............................................................................. 58 
Safety.......................................................................................................................................................................................58 
Vertical Protection (VPROT)...............................................................................................................................................58 
Faults Connected to the VDP.................................................................................... 59 
Picture Rotation................................................................................ 60 
Circuit Description ............................................................................................... 60 
Scan Velocity Modulator ...................................................................... 61 
Circuit Description ............................................................................................... 61 
Faults in the Picture Rotation and Scan Velocity Modulator Circuit ......................................... 62 
Preventative Maintenance ..................................................................... 63 
Servicing Tips .................................................................................. 64 
Error Codes....................................................................................................... 67 
Part Changes ................................................................................... 68 
Remote Control Battery Covers ................................................................................. 68 
CRT Types ........................................................................................................ 68 
Service Mode .................................................................................. 69 
Entering the Service Mode ...................................................................................... 69 
Geometry Adjustments........................................................................................... 70 
G2 Setting ........................................................................................................ 70 
G2 Adjustment ................................................................................................... 70 
Grey Scale Adjustment .......................................................................................... 71 
Voltage Tables ................................................................................. 72 
IC1001 – Microprocessor ........................................................................................ 73 
IC801 – Video Sync Processor (VDP) ........................................................................... 74 
IC305 – Multiple Sound Processor (MSP)....................................................................... 75 
IC1801 – Cathode Drive Amplifier (CDA) ...................................................................... 76 
IC301 / IC302 - Audio Amplifiers ............................................................................. 77 
IC702 - Primary Control ........................................................................................ 77 
IC501 - Vertical Output ........................................................................................ 78 
IC1003 - NVM ................................................................................................... 78 
IC2401 - Megatext.............................................................................................. 79 
IC201 - IF ....................................................................................................... 80 
 
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Download Sharp 76GF-63 (serv.man2) Service Manual (Repair Manual)

Here you can view online or download Sharp 76GF-63 (serv.man2) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp 76GF-63 (serv.man2) CTR. Information contained in Sharp 76GF-63 (serv.man2) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).