Read Sharp 56FW-53H Service Manual online
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
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
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
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
CRT Types ........................................................................................................ 68
Service Mode .................................................................................. 69
Entering the Service Mode ...................................................................................... 69
Geometry Adjustments........................................................................................... 70
G2 Setting ........................................................................................................ 70
G2 Adjustment ................................................................................................... 70
Grey Scale Adjustment .......................................................................................... 71
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
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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