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DA100 (50Hz) and DA50W Chassis – Repair Notes
Page 5 of 80
Sharp Electronics (UK) Limited - May 2003
Revision 3
Figures
Figure 1: DA100 (50Hz) Chassis – model 56FW53H .................................................................................................................7
Figure 2: Power Supply Layout (Component Side).................................................................................................................... 13
Figure 3: Power Supply Component Locations (Print Side) .................................................................................................... 13
Figure 4: Location of Supply Measurement Points................................................................................................................... 14
Figure 5: Power Supply Schematic Diagram.............................................................................................................................. 15
Figure 6: Q701 Gate Waveform................................................................................................................................................... 16
Figure 7: Standby Power Supply .................................................................................................................................................. 17
Figure 8: Degauss Circuit .............................................................................................................................................................. 18
Figure 9: +5V Generation Circuit ................................................................................................................................................. 19
Figure 10: 3.3V Regulation Circuit............................................................................................................................................... 19
Figure 11: Location of R792 ..........................................................................................................................................................20
Figure 12: Location of R623..........................................................................................................................................................20
Figure 13: Power Factor Circuit (56FW53H)............................................................................................................................ 21
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left)..............................................................22
Figure 15: 56FW53H Power Factor Correction PWB..............................................................................................................22
Figure 16: Location of 56FW53H Power Factor PWB.............................................................................................................22
Figure 17: Location of D735 .........................................................................................................................................................23
Figure 18: Location of Audio Stage components (Main PWB) ...............................................................................................23
Figure 19: Location of Centre Speaker PWB ............................................................................................................................24
Figure 20: Location of Components on the CRT PWB .............................................................................................................24
Figure 21: Location of SMD Capacitor on IC708 .....................................................................................................................25
Figure 22: Horizontal Output Stage...........................................................................................................................................27
Figure 23: Location of Horizontal Stage Components ............................................................................................................28
Figure 24: Q601 Base Drive Waveform .....................................................................................................................................28
Figure 25: GF Focus Modulator Circuit ......................................................................................................................................29
Figure 26: Picture of the FW Focus Modulator PWB .............................................................................................................29
Figure 27: FW Focus Modulator Circuit.....................................................................................................................................30
Figure 28: Location of Link Wire JL2 ........................................................................................................................................ 31
Figure 29: East West Circuit .......................................................................................................................................................32
Figure 30: East/West Circuit – Print Side................................................................................................................................33
Figure 31: East/West Circuit - Component Side......................................................................................................................33
Figure 32: East/West Drive Waveform - Pin 32 of IC801....................................................................................................34
Figure 33: 66cm and 76cm CRT PWB .........................................................................................................................................36
Figure 34: 56FW53H CRT PWB...................................................................................................................................................36
Figure 35: Vertical Output Amplifier.........................................................................................................................................38
Figure 36: Vertical Fly-back Circuit ...........................................................................................................................................39
Figure 37: Vertical Protection Signal (VPROT - Pin 11 of IC801) ........................................................................................39
Figure 38: Vertical Scan Coil Waveform - Top of Coil ...........................................................................................................40
Figure 39: Vertical Scan Coil Waveform - Bottom of Coil.....................................................................................................40
Figure 40: Vertical Stage - Component Side ............................................................................................................................ 41
Figure 41: Vertical Stage - Print Side........................................................................................................................................ 41
Figure 42: Audio Amplifier Circuit (left channel)....................................................................................................................43
Figure 2: Power Supply Layout (Component Side).................................................................................................................... 13
Figure 3: Power Supply Component Locations (Print Side) .................................................................................................... 13
Figure 4: Location of Supply Measurement Points................................................................................................................... 14
Figure 5: Power Supply Schematic Diagram.............................................................................................................................. 15
Figure 6: Q701 Gate Waveform................................................................................................................................................... 16
Figure 7: Standby Power Supply .................................................................................................................................................. 17
Figure 8: Degauss Circuit .............................................................................................................................................................. 18
Figure 9: +5V Generation Circuit ................................................................................................................................................. 19
Figure 10: 3.3V Regulation Circuit............................................................................................................................................... 19
Figure 11: Location of R792 ..........................................................................................................................................................20
Figure 12: Location of R623..........................................................................................................................................................20
Figure 13: Power Factor Circuit (56FW53H)............................................................................................................................ 21
Figure 14: Power Factor Correction PWB – 66 and 76cm Models (PWB on left)..............................................................22
Figure 15: 56FW53H Power Factor Correction PWB..............................................................................................................22
Figure 16: Location of 56FW53H Power Factor PWB.............................................................................................................22
Figure 17: Location of D735 .........................................................................................................................................................23
Figure 18: Location of Audio Stage components (Main PWB) ...............................................................................................23
Figure 19: Location of Centre Speaker PWB ............................................................................................................................24
Figure 20: Location of Components on the CRT PWB .............................................................................................................24
Figure 21: Location of SMD Capacitor on IC708 .....................................................................................................................25
Figure 22: Horizontal Output Stage...........................................................................................................................................27
Figure 23: Location of Horizontal Stage Components ............................................................................................................28
Figure 24: Q601 Base Drive Waveform .....................................................................................................................................28
Figure 25: GF Focus Modulator Circuit ......................................................................................................................................29
Figure 26: Picture of the FW Focus Modulator PWB .............................................................................................................29
Figure 27: FW Focus Modulator Circuit.....................................................................................................................................30
Figure 28: Location of Link Wire JL2 ........................................................................................................................................ 31
Figure 29: East West Circuit .......................................................................................................................................................32
Figure 30: East/West Circuit – Print Side................................................................................................................................33
Figure 31: East/West Circuit - Component Side......................................................................................................................33
Figure 32: East/West Drive Waveform - Pin 32 of IC801....................................................................................................34
Figure 33: 66cm and 76cm CRT PWB .........................................................................................................................................36
Figure 34: 56FW53H CRT PWB...................................................................................................................................................36
Figure 35: Vertical Output Amplifier.........................................................................................................................................38
Figure 36: Vertical Fly-back Circuit ...........................................................................................................................................39
Figure 37: Vertical Protection Signal (VPROT - Pin 11 of IC801) ........................................................................................39
Figure 38: Vertical Scan Coil Waveform - Top of Coil ...........................................................................................................40
Figure 39: Vertical Scan Coil Waveform - Bottom of Coil.....................................................................................................40
Figure 40: Vertical Stage - Component Side ............................................................................................................................ 41
Figure 41: Vertical Stage - Print Side........................................................................................................................................ 41
Figure 42: Audio Amplifier Circuit (left channel)....................................................................................................................43
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