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You do these tests to examine the DU liquid crystal display (LCD). The DU BITE circuits do not monitor the LCD quality. The failures you 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 shows again until you get to the top of the display. 
All the DUs must 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 
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DU COLOR TEST (TYP)

 

DU STRIPE TEST

CDS - TRAINING INFORMATION POINT - CDU CDS BITE PAGES - DU OPTICAL TEST

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737-600/700/800/900 TRAINING MANUAL

CDS -- TRAINING INFORMATION POINT - CDU 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 TESTS MENU page. This shows the WXR/TERR DISP TEST page.
You do these tests to do a check of the weather radar and GPWS ARINC 453 interfaces to the DEUs.
WXR/TERR DISPLAY TEST Page
To do the WXR DISPLAY TEST, use the directions on the CDU page. Select the test mode on the weather radar control panel.
Then select the map mode and the WXR switch on the EFIS control panels. The weather radar pattern shows on the display units.
If one of the weather radar test patterns does not show when you do the test, the ARINC 453 interface to the graphics generator has a failure.
Push LSK 6R, CONTINUE, to do a test of the terrain display.

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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - CDU CDS BITE PAGES - WXR/TERR DISPLAY TEST - TERR DISPLAY General
You do this test to make sure the GPWS ARINC 453 interface to the DEUs is good.
WXR/TERR DISPLAY TEST Page 5
After the WXR display test is complete, you can do a test of the GPWS display. Follow the directions on the CDU page. Select TERR on the two EFIS control panels. You must be in the correct mode on the navigation displays.
If one of the terrain patterns does not show when you do the test, the ARINC 453 interface to the graphics generator is bad or the WXR/TERR relay has a failure.
To go out of the test, push LSK 6R, CONTINUE. Then push LSK 6L, INDEX.
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CDS - TRAINING INFORMATION POINT - CDU CDS BITE PAGES - WXR/TERR DISPLAY TEST - TERR DISPLAY

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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - CDU CDS BITE PAGES - IDENT/CONFIG General
To do a check of the configuration data, select IDENT/CONFIG on line select key (LSK) 4L from the CDS MAIN MENU. This shows the IDENT/CONFIG page.
IDENT/CONFIG Page
The IDENT/CONFIG page shows this data:
-Operational software (OPS) part number
-Operational program configuration (OPC) software

part number
-Display unit data base (DUDB) software part number
-DEU hardware part number
-Program pins.

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CDS - TRAINING INFORMATION POINT - CDU CDS BITE PAGES - IDENT/CONFIG

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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - CDU CDS BITE PAGES - INPUT MONITORING General
To do a check of the discrete status inputs, select INPUT MONITORING on line select key (LSK) 5L from the CDS MAIN MENU. This shows the DISCRETE STATUS MENU page.
You can only monitor discrete input status with this page. You can not monitor ARINC 429 input status.
DISCRETE STATUS MENU Page
On the DISCRETE STATUS MENU page, you select one of the five connectors. The connectors are A, B, D, E, and F.
DISCRETE STATUS Page
The DISCRETE STATUS pages shows a matrix of all the pins on the connector. This is what shows for the status of each pin:
　
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