Compaq P1220 Wartungshandbuch PDF herunterladen (Seite 2)

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Contents

1. Circuit description ...................................................................................................................... 1-1

1.1 Power block ......................................................................................................................... 1-1

1.1.1 Outline ...................................................................................................................... 1-1

1.1.2 Rectifying circuit ....................................................................................................... 1-1

1.1.3 Surge current suppression ...................................................................................... 1-1

1.1.4 Higher harmonic circuit ............................................................................................ 1-2

1.1.5 Sub power circuit ...................................................................................................... 1-4

1.1.6 Main power circuit..................................................................................................... 1-4

1.1.7 Degaussing circuit .................................................................................................... 1-7

1.1.8 Power management circuit ...................................................................................... 1-7

1.1.9 Protective circuit ....................................................................................................... 1-7

1.2 Horizontal deflection block ................................................................................................ 1-12

1.2.1 Distortion compensation waveform generating circuit ........................................ 1-13

1.2.2 Deflection current compensation circuit ................................................................ 1-22

1.3 Vertical output block ........................................................................................................... 1-24

1.4 High voltage block .............................................................................................................. 1-25

1.4.1 High voltage control circuit...................................................................................... 1-25

1.4.2 Protective function circuit ........................................................................................ 1-25

1.4.3 DBF (Dynamic Beam Focus) circuit ....................................................................... 1-27

1.5 CRT compensation block ................................................................................................... 1-29

1.5.1 Rotation circuit .......................................................................................................... 1-29

1.5.2 Corner purity circuit .................................................................................................. 1-29

1.5.3 Earth magnetism cancel circuit .............................................................................. 1-30

1.5.4 Digital dynamic convergence clear (DDCC) circuit ............................................. 1-31

1.6 Control block........................................................................................................................ 1-38

1.6.1 Sync. signal process ................................................................................................ 1-38

1.6.2 Front button ............................................................................................................... 1-38

1.6.3 I2C bus control .......................................................................................................... 1-38

1.6.4 Power control ............................................................................................................ 1-38

1.6.5 ABL, Beam protector ................................................................................................ 1-39

1.6.6 CRT support .............................................................................................................. 1-39

1.6.7 High voltage control ................................................................................................. 1-39

1.6.8 Display Data Channel .............................................................................................. 1-40

1.6.9 LED ............................................................................................................................. 1-40

1.6.10 Clamp pulse ............................................................................................................. 1-41

1.6.11 SPARK ...................................................................................................................... 1-41

1.6.12 Avoidance operation during input SYNC switching ........................................... 1-41

1.6.13 CS switch and vertical linearity switch ............................................................... 1-41

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Compaq P1220 Wartungshandbuch Seite 2