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CDS DEU 2 MAINT/BITE DU LOOP TEST MENU 1/ 1
<COAX1 TO LT DISPLAYS & COAX2 TO RT DISPLAYS
<COAX2 TO LT DISPLAYS & COAX1 TO RT DISPLAYS
<INDEX
CDS BITE PAGES -DU LOOP TEST -DEU 2
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737-700 MAINTENANCE TRAINING MANUAL
LOB DU LIB DU
UC
DU
RIB
DU
ROB
DU
1243 1243 1243 1243 1243
YY YY
LC
DU
COAX COAX COUPLERS COUPLERS 2 + 41 + 3 COAX 1 COAX 1 COAX 2
GG A GG A GG B
ELECTRONICS
UNITS DISPLAY
A31-62-00-808.fm
DEU 1 DEU 2
DEU’S, COAX AND COUPLERS
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737-700 MAINTENANCE TRAINING MANUAL
CDS BITE PAGES - DU OPTICAL TEST
General defects easily. The line defects may not be as easy to see on a solid
display. 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
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CDS BITE PAGES - DU OPTICAL TEST
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CDS BITE PAGES - WXR/TERR DISPLAY TEST
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.
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