iv
1.4 CRT compensation block .................................................................................................. 1-10
1.4.1 Earth magnetism cancel circuit.............................................................................. 1-10
1.4.2 Rotation circuit ......................................................................................................... 1-10
1.4.3 East-west horizontal magnetic field vertical position
canceling function ................................................................................................... 1-11
1.4.4 Corner purity circuit ................................................................................................. 1-11
1.4.4.1 Corner purity circuit operation .................................................................. 1-12
1.4.5 Vertical magnetic field landing cancel circuit ...................................................... 1-12
1.4.6 Digital dynamic convergence clear (DDCC) circuit ............................................ 1-12
1.4.6.1 Production of compensation current waveform ..................................... 1-13
1.4.6.2 Waveform, and operation on the picture ................................................ 1-13
1.4.6.3 Adjustment method .................................................................................... 1-13
1.4.6.4 Block diagram ............................................................................................. 1-14
1.4.7 East-west horizontal convergence canceling function ....................................... 1-19
1.5 USB circuit ........................................................................................................................... 1-19
1.5.1 Outline ....................................................................................................................... 1-19
1.5.2 USB downstream power supply ............................................................................. 1-19
1.5.3 HUB controller power output .................................................................................. 1-19
1.5.4 USB power on reset ................................................................................................ 1-19
1.6 Control block ....................................................................................................................... 1-20
1.6.1 Function of control circuit ....................................................................................... 1-20
1.6.2 Auto-tracking process ............................................................................................. 1-20
1.6.3 EEPROM ................................................................................................................... 1-20
1.6.4 On-Screen-Manager (OSM) controller .................................................................. 1-20
1.6.5 Heater voltage control ............................................................................................. 1-20
1.6.6 Protection circuit operation .................................................................................... 1-20
1.6.6.1 X-ray protector ............................................................................................ 1-20
1.6.6.2 High voltage data error detection ............................................................ 1-21
1.6.6.3 Beam current protector .............................................................................. 1-21
1.6.6.4 Power-On Indicator (LED) flickering pattern
in each protector operating ...................................................................... 1-21
1.6.6.5 Operating time ............................................................................................ 1-21
1.6.6.6 The DDC communication .......................................................................... 1-21
1.6.6.7 Microcomputer pin assignment ................................................................ 1-22
1.7 X-ray protection circuit and safety protection circuit ................................................... 1-23
1.7.1 X-ray protection circuit ............................................................................................ 1-23
1.7.2 Beam current protection circuit.............................................................................. 1-23
1.7.3 IC701 overcurrent protection circuit ..................................................................... 1-23
1.7.4 IC701 overload protection circuit .......................................................................... 1-23
1.7.5 IC902 overcurrent protection circuit ..................................................................... 1-23
Summary of Contents for DPro2070SB
Page 22: ...1 15 Fig 7 The principle of DDCC compensation ...
Page 23: ...1 16 Fig 8 a DDCC adjustment item ...
Page 24: ...1 17 Fig 8 b DDCC adjustment item ...
Page 25: ...1 18 Fig 9 DDCC circuit diagram ...
Page 103: ...4 Wave form 1 POWER 2 CONTROL MAIN 3 DEFL MAIN 4 DEFL SUB COIL DRIVE MAIN 5 VIDEO ...