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3.
Video Circuit
Outline
Video signal processing is performed in the UOC IC601. The IF signal from tuner,
video inputs from AV1, AV2 and YUV are fed to UOC IC601 for video processing. RGB
output from UOC IC601 is then fed to CRT drive circuit to drive the CRT.
3.1
Video Signal Processing
IF signals from tuner are input to IC601 at pin 18 & 19. It is then fed to an
external sound trap at pin 38 to remove the unwanted SIF component and output signal is
fed to pin 40 IC601. Video inputs from AV1 (pin 42), AV2 (pin 44) and IF signal are fed
to internal Video Switch. The selected video signal will go through YC separation and
colour decoding where output (YUV) is then fed to an internal YUV switch.
YUV signal is input at pin 52, 53 and 51 to IC601. Internal YUV switch will feed
the selected YUV signals to RGB matrix to produce RGB signals. RGB signals are then
send to CRT drive circuit located on L-Board via pin 56, 57 and 58 to drive the CRT.
Fig 3.0
14
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