THOMSON VP2750 Technical Manual page 59

KEY DISPLAY BOARD (KDB)
DISPLAY CONTROL CIRCUIT
This front-panel control circuit consists of:
a- Control microcontroller IK001F. This issues display commands, and relays the front-
panel keyboard commands to the servo control microcontroller.
Note: The control microcontroller is also the satellite receiver on certain models.
b- Display GK01 BJ446GK.
c- Front panel control keyboard.
d- Camera video/audio input socket circuit AV3, on the front panel on certain models.
e- Satellite receiver control circuit (on certain models).
DISPLAY
The control MCU (IK001) issues the display grid control signals from its outputs 36 through 49
and 27 through 37.
At outputs 50 through 64 or 38, or 41 through 44, 1 through 8, it generates display segment
commands.
For a segment to be lit (anode), there must be a high level (5 V) simultaneously on a grid
control and a segment control.
Filament heating is obtained from LP050 winding 16/17 and DP051.
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