Input video signals are amplified by means of IC401, and the amplified signals drive the video output stage (IC402). Video gain is adjusted by DC voltage at pin 12 for ABL control.
The video output signals from IC401 are amplified again by IC402, and IC402 applies video signals to each cathode of the CRT. Cutoff voltages are adjusted by Q405, Q406, and Q407 which is operated by I²C BUS control through the microprocessor.
The OSD signal is applied from IC403 to IC402. It is controlled by I²C BUS control line.
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