6-5
CIRCUIT DESCRIPTION
III. Video PWB Circuit Operation
1. Y/C separation
(1) Overall configuration
The video input signal is input from Pin 1 of the “YC” connector, and led to IC5005, IC5006, Q3060, and
Q9009.
IC5005 and IC5006 are used for signal changeover among this video signal, a Y/C signal processed by 3-line
Y/C separation, another Y/C signal processed by three-dimensional Y/C separation, and one more Y/C signal
(input at Pin 3 and Pin 5 of the “YC” connector) obtained when an input is available at Terminal S. IC5005 is in
charge of changeover in the signal Y system and IC5006 is intended for changeover in the signal C system.
SW
SW
SW
VIDEO
2LINE Y/C
Three-dimensional Y/C
Terminal S input
(2) Three-dimensional Y/C separation (for NTSC)
The video signal input into Q9009 is arranged for band limitation by FL9001. It is corrected for level/F charac-
teristics by the amplifier (of Q9011 and Q9012) at the latter stage. The resultant output is fed from Q9013 to
IC9003 at 1.5Vp-p.
The same signal is sync-clamped by Q9017 and the signal sync-separated at Q9018 is entered in IC9004.
Thus the stable signal at 8 times the horizontal frequency is output from Pin 18.
In IC9009, three-dimensional Y/C separation is conducted by the interface between IC9001 and IC9002. The
Y signal is output from Pin 48, while the C signal is output from Pin 51.
The Y and C signals are processed for band limitation at FL9002 and FL9003. They are amplified at the next
stage, and then input in the changeover circuit of IC5005 and IC5006.
Band limitation /
F chara cteristic correction
Q9009, FL9001
Q9011, Q9012
Three-dimensional
Y/C separation
IC9003 (TC9086)
IC9001, IC9002
Band limitation /
F chara cteristic correction
Q9001~9004, FL9003
Signal Y
VIDEO
IN
Sync separation
QQ9017, Q9018
Horizontal AFC
IC9004
Band limitation /
F chara cteristic correction
Q9005~9008, FL9002
Signal Y output
Signal C output
8fh
VSYNC
Signal C
H/V
Содержание PlasmaSync PX-42M2A
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Страница 153: ...9 1 Ferrite mounting and wiring 1 Ferrite core ZCAT2032 930 61605059 2 Ferrite core ESD R 19 61605166 METHOD OF WIRING ...
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Страница 197: ...PRINTED IN JAPAN 9806MI1250 01272002 PX 42M2A 01272003 PX 42M2G ...