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737-700 MAINTENANCE TRAINING MANUAL
CDS BITE PAGES - DEU SELF-TEST 2
DEU Self-Test Results
When the self-test is over, the MCDU shows the results. If the DEU is OK, the MCDU shows DEU SELF-TEST PASSED. The DEU stores the results of the self-test. The MCDU shows the CAUTION display. Do not remove power to the DEU during this time. When the MCDU shows the INDEX, the test results are stored.
If the DEU senses faults during the self-test, the MCDU shows SELF-TEST FAILED. The DEU stores the results of the self-test. The MCDU shows the CAUTION display. Do not remove power to the DEU during this time. When the DEU removes the CAUTION display, you can push LSK 6R to see the faults. When you are finished, push LSK 6L to return to the index.
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737-700 MAINTENANCE TRAINING MANUAL

TEST PASS
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CDS BITE PAGES - DEU SELF-TEST 2

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737-700 MAINTENANCE TRAINING MANUAL
CDS BITE PAGES - DU LOOP TEST THIS PAGE INTENTIONALLY LEFT BLANK
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CDS BITE PAGES - DU LOOP TEST General
To do the DU loop test, select line select key (LSK) 2L, DU LOOP TEST from the GROUND TEST MENU PAGE. This shows the DU LOOP TEST MENU page. The loop test checks the interface between the DEU’s, coax coupler and Dispaly units.
DU LOOP TEST MENU Page
On the DU LOOP TEST MENU page you can select two tests.
To operate the first test, select LSK 2L. This makes the graphics generator (GG) A (coax 1) transmit data to the left DUs and the upper center DU; and the GG B (coax 2) transmit data to the right DUs and the lower center DU.
To operate the second test, select LSK 4L. This makes the graphics generator (GG) B (coax 2) transmit data to the left DUs and the upper center DU; and the GG A (coax 1) transmit data to the right DUs and the lower center DU.
Display Unit Display
When you operate the DU loop test, the display units show this information:
-DU location
-ARINC 429 loop status
-Remote light sensor brightness value
-Coax output source
-Coax cable input activity
-Bezel light sensor brightness value
-Unit brightness value.
737-700 MAINTENANCE TRAINING MANUAL
The DU location shows:
-LOB for left outboard
-LIB for left inboard
-CU for upper center
-CL for lower center
-RIB for right inboard
-ROB for right outboard.

An invalid DU location shows as BAD.
The ARINC 429 loop status shows the status of the ARINC 429 bus from the DU to the DEUs. A PASS or FAIL shows.
　
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