Barco 808/Cine8

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5) RGB switcher board:

This board is controlled by the controlled board, and tells the RGB switcher board to send the video. S-video, RGB, or component signal (if applicable) to the CRT video boards. As per the picture, the respective green LED’s should light up when a signal is selected and fed into the projector


 
6) Quad decoder board:

This board breaks down the video and S-video signals down to the  RGB components to feed to each CRT. This board also provides a blanking signal to the V board for electronic blanking of the image.