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10. Communications
B data and clock bus
This data bus is a bi-directional bus connecting the Main Micro IC001 with the two Non-Volatile Memory (NVM)
ICs. The data and clock lines are 4Vp-p and are always present as long as the TV is powered ON.
On Screen Displays
The main (white) menu comes from the Digital Processor Micro within the Q box. The menu data is sent on an
EMI communications bus used solely within the Q box to its OSD IC, which is also within the Q box.
The green service mode OSD, channel numbers and user functions (e.g. volume, picture) come from the Main
Micro IC001 on the B board. IC001 communicates with the Q box for this purpose using RXD and TXD as
explained above. The OSD RGB output is applied to the video processor IC on the A board.
The white crosshatch patterns and dots OSD used for convergence in the projection TV set (RA-5A chassis)
comes from the AD board. The OSD RGB output is applied to the video processor IC on the A board.
Summary of Contents for KD-34XBR2 - 34" Hdtv Fd Trinitron Wega
Page 77: ...74 RA 5A Chassis Board Layout ...
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