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9600 Service Manual - gmecorp-usa.com

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Video Control 3<br />

SCAN CONVERTER PCB INTERFACE<br />

After the video data has been processed by the Image Processor circuitry, left and right<br />

video data is also sent to the scan converter interface circuitry. The scan converter<br />

interface buffers the left and right video data out of the Image Processor PCB via<br />

connector P9 to the Scan Converter PCB.<br />

PIO<br />

The Image Processor PCB contains two PIO chips. PIO U4 provides internal control<br />

signals used within the Image Processor PCB. PIO U3 provides external control signals<br />

which go to the Video Switching PCB. Input signals from the Video Switching PCB are<br />

read by PIO U3. The Image Processor creates a 24 bit serial data output from PIO U3<br />

that controls the Video Switching PCB. The 24 bit serial data output from U3 to the<br />

Video Switching PCB controls the following items:<br />

• Video Crosspoint Switch<br />

• Genlock<br />

• Anti-Alias Filter<br />

• Logarithmic Amplifier<br />

• X-Ray Disable

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