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percentage of maximum value. The range is 0 to 100. BAD
shows if the input is bad.
The coax output shows the GG that transmits data to the display
unit. The sources show as:
* 1 for GG A in DEU 1 or DEU 2
* 2 for GG B in DEU 1 or DEU 2.
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The coax cable input activity shows the status of the four coax
cable inputs to the DU. A Y for yes and a N for no shows. A white
highlight box shows around the specific coax cable input that
currently transmits to the DU. From left to right the letters refer
to these coaxial couplers:
* First letter for coax coupler 1 from DEU 1, GG A
* Second letter for coax coupler 2 from DEU 1, GG B
* Third letter for coax coupler 4 from DEU 2, GG A
* Fourth letter for coax coupler 3 from DEU 2, GG B.
The bezel light sensor brightness value shows as a percentage
of maximum value. The range is 0 to 100. BAD shows if the input
is bad.
The unit brightness value shows as a percentage of maximum
value. The range is 0 to 100. BAD shows if the input is bad. This
value changes if you change the unit brightness with the
brightness controls.
The WXR brightness value shows as a percentage of maximum
value. For the left inboard, right inboard, and lower center
display units, the range is 0 to 100. BAD shows if the input is
bad. This value changes if you change the unit brightness with
the brightness controls. For the left outboard, right outboard,
and upper center display units, the value 0 shows.
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General
To do the DU optical test, select line select key (LSK) 3L, DU
OPTICAL TEST from the GROUND TEST MENU PAGE. This
shows the DU OPTICAL TEST MENU page.
You do these tests to examine the DU liquid crystal display
(LCD). The DU BITE circuits do not monitor the LCD quality. The
failures to look for are line defects and element defects in the
LCD.
DU OPTICAL TEST MENU Page
On the DU OPTICAL TEST MENU page, these are the four tests
that you can select:
* RED
* BLUE
* GREEN
* STRIPE.
To do the RED test, select LSK 1L. This makes all the DUs show
red lines. From the bottom of the display, each line shows less
color intensity. The pattern repeats until you get to the top of the
display.
All the DUs should look the same. A DU with a weak backlight
driver looks different than the other DUs.
The BLUE and GREEN tests are similar to the RED test.
Do the STRIPE test the same as the RED test. For the STRIPE
test, the DUs show diagonal white and black stripes. This test
lets you see line defects easily. The line defects may not be as
easy to see on a solid display.
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General
To do the weather radar display test and the terrain display test,
select line select key (LSK) 4L, WXR/TERR DISPLAY TEST, from
the GROUND TEST MENU PAGE. This shows the WXR/TERR
DISPLAY TEST page.
You do these tests to verify the weather radar and GPWS ARINC
453 interfaces to the DEUs.
WXR/TERR DISPLAY TEST Page
To do the WXR DISPLAY TEST, follow the directions on the CDU
　
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