Circuit Description - NEC MultiSync FP1370 Service Manual

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........................................................................................... 8-12
6) Rotation Correction Circuit................................................................................................ 8-12
7) H Centering Circuit.......................................................................................................... 8-14
2-3. VERTICAL DEFRECTION CIRCUIT.....................................................................................................8-15
1) Sawtooth wave generating, vertical size and position control and linearity control circuits..................8-15
2) Vertical filter circuit............................................................................................................................... 8-15
3) Vertical output amplifier circuit..............................................................................................................8-16
3. HIGH VOLTAGE CIRCUIT...................................................................................................... 8-17
1) High Voltage Control Circuit................................................................................................. 8-17
2) High Voltage Output Circuit.................................................................................................. 8-17
3) High Voltage Protector Circuit.............................................................................................. 8-17
4 .BLANKING CIRCUIT............................................................................................................ 8-19
1) Blanking Circuit................................................................................................................. 8-19
2) Spot Killer Circuit............................................................................................................... 8-19
3) Auto Adjust Blanking Circuit................................................................................................. 8-19
5. DYNAMIC FOCUS CIRCUIT................................................................................................... 8-20
1) The horizontal parabolic wave generation and gain control circuit................................................ 8-20
2) The vertical parabolic wave generation and gain control circuit................................................... 8-20
3) The output amplifier circuit and the coupling circuit................................................................... 8-21

CIRCUIT DESCRIPTION

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