186
Version 2.0
Operator’s Manual
Engineering Mode
The CDU will go on to conduct a
Contrast
test. Observe that the
display goes through its full range of contrast from white to black.
Press
OK
if it varies correctly or
Fail
if it doesn’t. Next, the CDU will
conduct a
Backlight
test. Observe that the display goes through its
full range of illumination. Press
OK
if it varies correctly or
Fail
if it
doesn’t.
Then, the CDU will conduct a
Keylight
test. You may need to dim the
lights in the room or shade the keyboard so that you can see the
backlights behind the function and softkeys. Observe that the keypad
backlights go through their full range of illumination. Press
OK
if it
varies correctly or
Fail
if it doesn’t.
Upon completion of the above tests, a Test Results screen will be
displayed. In addition to the visual tests which you witnessed, the
CDU also performs background tests on the program memory (
FLASH
ROM
) and the real-time
Clock
. These tests check about 90% of the
Summary of Contents for MX420
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