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Glossary
A-2 Model 250 Service Manual
Field One half of a complete video frame. Odd lines in
one field and even lines in another make up one
frame.
Frame One complete TV picture or screen of
information. It is composed of two fields and has
a total of 525 scanning lines in NTSC
transmission.
Horizontal Scan Reverses the image projection for front or rear
Reversal Jumper projection. Located on the Horizontal Deflection
Board and Scan Reversal PCB.
Horizontal Size Coils Adjustment coils on the Scan Reversal Board.
Used to adjust the horizontal size (width).
Hot Spot The Arc Lamp’s brightest area on the screen.
Used to align and focus the Arc Lamp.
Hue Also referred to as tint. A specific color such a
blue, pink or aqua. Hue or tint control on a
display device adjusts red/green balance.
Ignitor Provides a momentary high voltage to excite the
gases in the Xenon Arc Lamp to ignite.
Image Light Amplifier A device that uses low-intensity images to phase
ILA
®
modulate a high-intensity light through a liquid
crystal layer. It is a key component in
producing very bright, high resolution images
from Hughes-JVC large-screen projectors.
Image Mirror Also referred to as a “Steering Mirror”. It directs
the blue and red images toward the Combining
Prism.
Interlacing The technique that refreshes a display screen by
alternately displaying all the odd lines (field one)
and then all the even lines (field two) of one
frame.
I/R Detector The Model 250 Projector has two I/R Detectors,
one in front, one in back. These windows receive
projector control signals from the I/R Remote
Control.
Laser Power Supply Provides boost voltage through a spark gap to the
Ignitor.