737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - CDU CDS BITE PAGES - DU LOOP TEST THIS PAGE INTENTIONALLY LEFT BLANK
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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - CDU 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 MENUS 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 data:
-DU location
-ARINC 429 loop status
-Remote light sensor brightness
-Coax output source
-Coax cable input activity
-Bezel light sensor brightness -Unit brightness.
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.

A DU location that is not valid 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 shows as a 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.

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 coax cable input that currently transmits to the DU. From left to right the letters show these coaxial couplers:

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CDS -- TRAINING INFORMATION POINT - CDU CDS BITE PAGES - DU LOOP TEST
-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 shows as a percentage of maximum value. The range is 0 to 100. BAD shows if the input is bad.
The unit brightness 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 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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REMOTE DU ARINC 429 LIGHT LOCATION LOOP SENSOR RIB PASS 50
BEZEL COAX INPUT LIGHT OUTPUT ACTIVITY SENSOR
2 YYYY 50
BRIGHTNESS CONTROLS
UNIT WXR 50 50
DU - LOOP TEST

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

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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT- CDU CDS BITE PAGES - DU LOOP TEST 2 General
The display electronics unit (DEU) has two graphic generators (GG). The GGs send display data to the display units (DU).
The GG display data goes to the DUs on coax cables. Each GG has one coax cable output. The coax cable output connects to a coax coupler.
The coax coupler receives the GG display data and divides the signal into six outputs. Each coax cable output sends the same display data to the six DUs.
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1243 1243 1243 1243 1243
1243
1

4 3
2

COAX COAX COUPLERS
COUPLERS
DEU 1 DEU 2 COAX
211 2
OUT GG A B A
B DU
Y Y Y Y
DISPLAY COAX
1 2 4 3COUPLERDEU 1 DEU 2

CDS - TRAINING INFORMATION POINT- CDU CDS BITE PAGES - DU LOOP TEST 2
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737-600/700/800/900 TRAINING MANUAL CDS -- TRAINING INFORMATION POINT - CDU CDS BITE PAGES - DU OPTICAL TEST
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.  stripes. This test lets you easily see line defects. The line defects can be less easy to see on a solid display. 
　
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