JVC 250 Service Manual page 15

Chapter 2---System Description
projector. These air-borne particles can land on optics such as the ILA
large diffuse dark areas on the screen.
EMI Shield
The Model 250 has an EMI (Electro-Magnetic Interference) Shield that traps and
collects high frequency noise that is radiated by switching power supplies such as
the Arc Lamp Power Supply and the Low Voltage Power Supply. This high
frequency noise can interfere with the operation of radios, televisions, and other
electronic devices.
Figure 2-2 Relative location of CRTs, Relay Lenses, ILA
2-8
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and cause
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s, and Air Filters.
Model 250 Service Manual