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test is complete.
The test takes 75 seconds. The test can take up to 180 seconds
because if the test fails the first time, the DEU operates the test a
second time before it reports a fault.
To do the self test, select LSK 6R, RUN.
To not do the self test, select LSK 6L, INDEX.
DEU SELF-TEST Page
When the you select RUN on the SELF TEST MENU page, the
core software takes 7 to 10 seconds to reset. The control screen
shows DEU SELF-TEST during the DEU reset. If the reset cannot
occur because of an internal DEU fault, the DEU SELF-TEST
FAIL screen shows. If the DEU BITE is inoperative, the DEU
SELF-TEST page will stay in view.
SELF-TEST IN PROGRESS
If the reset operates correctly, you see the SELF-TEST IN
PROGRESS page.
Training Information Point
If the DEU SELF-TEST page shows longer than 3 minutes, select
the INIT REF key on the CDU.
CDS - TRAINING INFORMATION POINT - CDU CDS BITE PAGES - DEU SELF TEST 1
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DEU Self-Test Results
When the self-test is over, the CDU shows the results. If the DEU
is OK, the CDU shows DEU SELF-TEST PASSED. The DEU
stores the results of the self-test. The CDU shows the CAUTION
display. Do not remove power to the DEU during this time. When
the CDU shows the INDEX, the test results are stored.
If the DEU senses faults during the self-test, the CDU shows
SELF-TEST FAILED. The DEU stores the results of the self-test.
The CDU 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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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.
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.
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.
The remote light sensor brightness value shows as a
　
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