Tektronix WVR8200, Service Manual

Page: 23 / 78

Theory of Operation
The WVR8200 and WVR8300 are modular waveform rasterizers. They can be
con
fi gured, with options, to accept Analog Composite inputs. Audio options can
add inputs for digital only or analog audio capability.
All models use an external DVI-I monitor for the display. All models also have
outputs to drive serial digital and analog picture monitors.
This theory of operation is mainly based on the High-level block diagram. (See
Figure 2-1.) When necessary, other block diagrams may also be referenced.
The lower portion of the block diagram covers functions on the main board. The
upper sections cover those of the optional video input and audio boards.
The primary functions on the main board are:
1. Serial digital input processing
2. Reference input
3. Waveform processing engine
4. Rasterizing, recursion, and picture processing engine
5. Control processor and its associated peripherals
6. Auxiliary and ancillary data processing
7. Secondary power distributions
There are also miscellaneous circuits, such as the thermal control system for
the fan.
Power Distribution is not shown in the block diagram but is covered at the end of
this section.
WVR8200 and WVR8300 Waveform Rasterizers Service Manual 2–1