Service manual

CA-11
Video Processing
Introduction
ICX2200 has numerous duties involved in television image and sound production. As mentioned above, it
processes sound and video IF. Additionally, it prepares NTSC video utilizing separated chroma, luma, and
OSD from IC6000. Accounting for controlled preference information from the micro such as brightness,
tint, sharpness, contrast, etc... the Jungle chip then produces this video signal as RGB which is amplified
and sent to the picture tube. Finally, the video processor generates the very drive signals that cause the
deflection circuitry to operate and produce high voltage as well as picture.
A/V Switching
At this point, because of its interaction with the video processor, an explanation of the jack-pack switching
section is expedient. Depending on the extra features a CA receiver has (S-VHS Video or Y/C, PiP), the
chassis will have two switching ICs, IC2901 and IC2902. IC2902 is the PiP switching IC. The first
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2
1
CH-2
CH-1
IC2901
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11
10
9
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5
4
3
2
1
CH-2
CH-1
IC2902
C2908
R2901M
R2915M
C2911
C2904
+9VSW
R2919M
R2918M
R2922M
Q2902
C2915M
C2913
C2910
C2912M
C2916
C2917M
C2914
R2920M
R2921M
C2906
C2900
C2909
W2903
J2902M
R2902M
ZD2901
R2923M
R2907
C2902M
C2918
L2901
C2903M
R2905M
C2918
R2917M
ZD2903
R2914
R2916
ZD2902
R2908
R2910M
R2911
R2909
C2907M
R2912
Ext-L
Ext-R
VM Out-L
VM Out-R
CM
Chroma-Comb
Aux Switch1
Ext Video
Y/C Sense
PiP Switch1
TVIN
VIN PiP
J1
External
Left
External
Right
Variable Monitor
Out - Left
Variable Monitor
Out- Right
Video-In S-VHS
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<<Figure CA-10>>