Table Of Contents - NEC FP1355 Service Manual

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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