Circuit Description - NEC MultiSync FP1350 Service Manual

CIRCUIT DESCRIPTION

TABLE OF CONTENTS
1. VIDEO CIRCUIT .................................................................................................................. 8-3
1) Selection of BNC/D-SUB Input ............................................................................................. 8-3
2) Video Signal Amplification Section ....................................................................................... 8-4
3) Video Bias Circuit ............................................................................................................. 8-5
4) ABL Circuit ..................................................................................................................... 8-5
5) On Screen Manager (OSM) ................................................................................................ 8-6
6) Self Test ......................................................................................................................... 8-6
2. DEFLECTION CIRCUIT ........................................................................................................ 8-7
2-1. The oscillation and deflection control integrated circuit ........................................................... 8-7
1) Digital Signal Processor (DSP) .......................................................................................................... 8-7
2) 1bit D/A converter ( 1bit DAC ) ......................................................................................... 8-7
2-2. HORIZONTAL DEFLECTION CIRCUIT ............................................................................... 8-8
1) Horizontal oscillation circuit and Horizontal position control circuit ............................................ 8-8
2) Distortion correction circuit ............................................................................................... 8-9
3) Horizontal Drive Circuit ................................................................................................... 8-11
4) Horizontal Deflection Output Circuit .................................................................................. 8-11
5) Horizontal Size Control Circuit ......................................................................................... 8-11
6) Rotation Correction Circuit ............................................................................................. 8-13
7) H Centering Circuit ....................................................................................................... 8-13
2-3. VERTICAL DEFRECTION CIRCUIT ................................................................................. 8-14
1) Sawtooth wave generating, vertical size and position control and linearity control circuits ............ 8-14
2) Vertical filter circuit ....................................................................................................... 8-14
3) Vertical output amplifier circuit ........................................................................................ 8-15
3. HIGH VOLTAGE CIRCUIT ................................................................................................... 8-16
1) High Voltage Control Circuit .............................................................................................. 8-16
2) High Voltage Output Circuit ................................................................................................ 8-16
3) High Voltage Protector Circuit ............................................................................................ 8-16
4 .BLANKING CIRCUIT .......................................................................................................... 8-18
1) Blanking Circuit .............................................................................................................. 8-18
2) Spot Killer Circuit ............................................................................................................ 8-18
3) Auto Adjust Blanking Circuit ............................................................................................... 8-18
5. DYNAMIC FOCUS CIRCUIT ................................................................................................ 8-19
1) The horizontal parabolic wave generation and gain control circuit .............................................. 8-19
2) The vertical parabolic wave generation and gain control circuit ................................................. 8-19
3) The output amplifier circuit and the coupling circuit ................................................................. 8-19
8-1
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