Sony UP-21MD Service Manual page 59

2. Output Signai Processing Biock (Encoder Biock)
(1) Video encoder block
On this board, BH7243KV (IC407) (made by ROHM) is used as the encoder of a video signal. This
circuit incorporates an eight-bit, three-channel DA converter and video encoder. By inputting a
subcarrier and composite sync signal, an eight-bit RGB digital signal can be converted into a
composite video signal by one chip. The output of RGB, S video, and composite video signals can be
driven in 75 ohms. Moreover, this circuit has an internal OSD (On Screen Display) selector switch.
Setting and adjustment are all performed by PCBUS. An OSD character signal is sent from the SY-
299 board.
TP703
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GCACTLI/MUTE
CLAWPLREF = VOUT
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Fig. 1-8 Video Encoder Circuit
UP-21MD V1 4-24