Sony KP 48S70, Training Manual

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15
On Screen Displays
Overview
On Screen Displays are generated by three different sources in the RA-
3 chassis. They are called Micro, V Chip/CC and PJ OSD. The Micro
OSD produces the source (channel) display and Program Palette (cus-
tomer menu). The V Chip/CC OSD displays V chip rating information
and can blank the picture if the rating for a program violates the settings
in the Parental Control Menu. CC information is displayed when CC On
is selected using the remote control and the received signal contains CC
information. The PJ OSD is used during the flash focus routine and
when PJE adjustments are selected in the Service Mode. These three
OSDs cannot be input to the YCJ at the same time. Therefore there is a
mute system in place to blank each OSD at the appropriate times.
Micro OSD
The Micro OSD is created by IC002 System Control. It contains infor-
mation such as channel number; video input source and the program
palette menu. IC002 System Control creates RGB for these different
on-screen displays. Q002, Q008 and Q009 buffer the RGB signals.
After buffering, the RGB signals are input to IC206/14, 15 and 16. The
YS and YM lines are used to place the OSD in the RGB outputs and
mute the V Chip/CC OSD.
The YS line is used to select the size and position of the OSD and the
YM line is used to determine the level of shading. Here shading refers to
the amount the video level is reduced beneath the OSD. This is evident
in the Program Palette Menu when the video can be seen in the back-
ground while the menu is superimposed over it. The YS signal is input
from IC002/36 to IC206/13. The YM signal is output from IC002/37 to
IC206/12. The main OSD can be muted using Q011, Q012 and Q013.
These mute transistors are controlled by IC002/35 Micro I. Main OSD
will be muted when the PJ OSD is in operation and also while IC1601
Main V Chip/CC is being displayed.
V Chip/CC OSD
IC1601 Main V Chip/CC creates this OSD. It outputs RGB that shows the
rating of the program selected. It will also blank the screen and show a
lock if the selected program is above the rating selected in the Parental
Control Menu. If the CC option is turned ON using the remote control,
then the CC text will be displayed at the bottom of the screen.
The RGB signals are output at IC1601/18, 2 and 3. They pass through
buffers Q010, Q014 and Q015 and are then input to IC206/14, 15 and 16.
Q018 through Q023 are mute transistors that are controlled by the YS
and YM lines from IC002 System Control IC.
PJ OSD
The PJ OSD is used to produce the RGB output during the flash focus
routine. It also is the OSD used during the PJE Service Mode. The
difference between the main OSD and PJ OSD in service mode is that the
main OSD is green and the PJ OSD is white.
The PJ OSD is output from two sources in the PJED circuit (not shown).
RGB, YM and YS are directly input to IC206 YCJ. There are separate
mute lines for each of the RGB sources in the PJED (not shown). See the
appendix for more information on how the PJ OSD is created.