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Tuner, Video and “S” Input Block Explanation
(See Pages 1
7
and 1
8
)
Main Picture (Tuner or Composite)
Input switch (IC2201) receives signals from the tuner, inputs 1 ~ 3 and the front
input (input F). Signals from the tuner or composite signals from inputs 1,2,3 or F
enter IC2201 and the user selected output for the main picture goes to IC2503.
IC2503 is a 3D Y/C separator for the main picture composite signals. After the
composite signals have been changed to 3D-Y/C signals they enter IC2803 and the
color demodulator inside this IC changes the signals to Y/CB/CR. IC2803 also
separates the horizontal and vertical sync. All signals at this point are sent onto the
progressive unit for I/P conversion. All signals entering the progressive unit are
converted to 480P at 31K or 1080I at 33K (user selectable). Signals entering the
progressive unit are converted to digital and resized for the user selected screen
mode and scan mode. The output signals from the progressive unit are converted
back to analog and the Y/CB/CR signals pass through switch IC4305 and go into the
sharpness and detail correction IC (IC4301) or bypass IC4301 through switch
IC4306 and enter IC4608. All picture, color correction and sync processing is done
inside IC4608. The output processed RGB signal from IC4608 is sent to the CRT
drive PCB’s.
Main Picture (“S”)
Inputs from the “S” connectors (inputs 1,2,3 and F) are user selected by IC2201 and
outputted to IC2503 as Y and C signals. Since these signals are already separated
IC2503 simply passes the signals through onto IC2803. From this point the signal
path is exactly the same as (Tuner or Composite).
Sub Picture (Tuner, Composite or “S”)
The sub picture path is used for the twin picture function and the multi picture
tuner scan feature. Any signal input into IC2201 can be used for the sub picture
output. The user selected sub picture output from IC2201 goes to IC2701 for Y/C
separation if the signal is Tuner or Composite. If the signal is of the “S” type it
simply is passed through IC2201 and enters IC2806 for color demodulation and
sync separation. The outputted Y/CB/CR and sync signals are then sent to the
progressive unit for twin picture or multi picture processing.