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Chapter 2---System Description
2.3.4 Video Processor PCB
The Video Processor Board (VPB) is the bottom-most card (see
Figure 5-1) in the card cage. It is connected directly to the
Backplane board through 2 connectors. When an external signal
is being received, the VPB provides Horizontal Sync, Vertical
Sync, and Green Sync signals to the Raster Timing Generator
(RTG) board. It also provides three primary color signals, and G2,
G1 bias and DC RESTORE control signals to the Video Amplifier
Board (VAB).
The following functions are provided by the VPB:
• Video signal input and multiplexing
• Sync signal stripping
• Overlay signal multiplexing
• Brightness and Contrast control, and DC RESTORE
• Video signal gamma correction
• Sensitivity and Threshold signal input and control
• Automatic limiting for Contrast, G2, and internal video
The Video Processor I/O diagram and the list of inputs and
outputs provide information to allow the technician to perform
module-level troubleshooting.
2-24 Model 200 Service Manual