*
Select function (left, center, or right CDU)

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CDU center, left, or right special function

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Description (same for all CDUs)

*
Special function condition -ready, inhibited, or completed

*
Special function instructions -what to look for on the CDU display

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CDU center, left, or right white test pattern

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CDU center, left, or right black test pattern

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CDU center, left, or right checkerboard test pattern.

CDU Display -Special Function Description
The CDU special function permits the operator to look for faults in the CDU LCD glass or drive circuits. Normal operating formats are not on the CDU during this special function.
The approximate time to run a CDU special function is two to five minutes.
There are no limitations or special requirements to run a CDU special function.
To do a CDU special function, select a CDU from the MAT select function screen/dialogue box. Next, read and follow the instructions on the MAT screens/dialogue boxes that show.
CDU LCD Test Pattern -White
This special function causes the CDU display to show a white test pattern. Look for defects on the display.
CDU LCD Test Pattern -Black
This special function causes the CDU display to show a black test pattern. Look for defects on the display.
CDU LCD Test Pattern -Checkerboard
This special function causes the CDU display to show a checkerboard test pattern. Look for defects on the display.
EFFECTIVITY BEJ ALL  34-61-00 
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777 AIRCRAFT MAINTENANCE MANUAL

FMCS -CDU SPECIAL FUNCTIONS

EFFECTIVITY BEJ ALL  34-61-00 
Page 98.109 
D633W101-BEJ  May 05/2003