Tektronix Grass Valley 4000, Installation And Service, Page: 141 / 286

3-3
System Overview
Control Panel
The control panels for the Model 4000 systems contain circuit boards for
controlling the panel functions.
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Input Voltages: 120 to 240 volts nominal (auto-ranging)
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Operating voltages: +5V and +14V
Signal Paths
The video takes one of the following paths (See Figure 3-1 ):
The normal path is:
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Input Module
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Crosspoint Module
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Keyer Module
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Mixer Interface Module
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Mix/Wipe Module
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Output Module
For reentry signals, the path is the same as the normal path except that instead of
going to the output module, the signal is routed to a reentry module then back into
the crosspoint module.
For effects send, the signals use the following path:
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Input Module
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Crosspoint Module
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Keyer Module
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Mixer Interface Module
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Effects Send Module
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Output Module
This will send the video and key out on an aux bus to a DVE.
The return signal path for the modified video and key is:
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Input module
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Crosspoint Module
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Effects Send Module
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Mixer Interface Module
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Mix/Wipe Module