On Screen Display (Osd); Asc (Auto Size And Center) - Sony CPD-420GS Training Manual

On Screen Display (OSD)

IC003 (OSD) is the On Screen Display character and graphic generator.
IC1001 (N Board) via the I 2 C data bus controls IC003 at pin 3 (SDA) and
pin 4 (SCL). The N Board also provides IC003 pin 5 (HSYNC), pin 6
(VSYNC) and pin 7 (HFLY) with the necessary sync timing signals. IC003
provides OSD R, G, B and Fast Blanking to RGB DRIVE IC001 for mixing
the OSD with the main video signal. The OSD R G B signal is output from
IC003 pin 14 (ROUT), pin 15 (GOUT) and pin 16 (BOUT) and is input to
IC001 pin 13 (B OSD), pin 14 (G OSD) and pin 15 (R OSD). The Fast
Blanking signal is output from IC003/17 (FBLK) and is input to IC001/17
(OSD BLK) which blanks the area where the OSD is to be displayed.
IC001/17 OSD BLK
The +12V DC supply from the D Board is input to IC009/1. IC901/3 out-
puts regulated +5V DC to IC003 pin 9 and pin 19 providing VCC operating
voltage.
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ASC (Auto Size and Center)

The ASC function automatically adjusts for proper size and centering of
the video image on the screen. This is provided by IC003 (OSD). The
HSYNC, V.SYNC and HRTRC signals from the N Board are input to IC003
pin 5 (HSYNC), pin 6 (VSYNC) and pin 7 (HFLY). When the ASC function
is selected, IC001/16 (V DET) outputs composite blanking to IC003/8 (AV).
This signal is processed by IC003, which outputs correction data via the
I 2 C data bus to the N Board for proper Size and Centering calculations.
This corrects the H Phase/H Size and V Size/Centering of the video sig-
nal.
IC003/8 AV
IC003/7 HFLY