Chapter 2—Functional Descriptions
2-44 Model 330. 340SC, and 370SC Service Manual
Figure 2-15
Video Processor Board, Block Diagram
Decoder
The optional decoder is a daughter board installed on the VPB. Since the VPB can
only operate on an RGB/sync signal, use of the decoder is necessary in order for
the projector to use a composite signal. The decoder takes a composite (NTSC,
PAL, or SECAM) or S-Vid input and converts it into an RGB Sync signal for
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