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DIGITAL COMB FILTER
The IC2400 is the digital comb filter for NTSC-U format
it is a 1H, 2L Digital comb filter.
It separates luminance (Y) and chrominance (C) signals
from NTSC system composite video signal by using 2
horizontal (H) lines and delaying 1horizontal line on
memory.
This logical comb filter reduce color dot interference
and realizes high performance Y/C separation.
VIDEO OUTPUT
The RGB signals are applied to the IC5100, which is the
video RGB output.
IC5100 is triple Amplifier with fix gain equal to 51, op-
erating at 9 Mhz of Bandwidth with small signal. It uses
one +Vcc equal or less of 200 DC Volts. AKB option is
not used for this model.
Using LR array the output is connected to its respective
Cathode
FA - SERVICING
SERVICING (continued)
1
2
3-6
COMB FILTER CRITICAL SIGNAL
On the Pin 10 (Fsc) color sub carrier signal tuned to
3.58 Mhz for chrominance and luminance separation.
If this signal is not present the next problems could
be happened:
a) Color flicker
b) Chroma beat
c) Luminance signal noise
SCAN VELOCITY MODULATOR
This signal comes from directly from Video Processor
IC2200.
Three stages for signal are:
1: Class A NPN Amplifier
2: Complementary symmetry Driver
3: Complementary symmetry output Amp
Impedance coupling network connects to SVM coil in
CRT assembly.
YUV SWITCH PROVISION
FA chassis also has a provision to support an additional
YUV input thru IC2902, 74HC4053AP,but this is only a
provision. This IC is a 6x3 DEMUX controlled by control
signal sent by IC6000, MICOM. The outputs point to
rear jack's YUV (Normally Closed inputs).
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