Case 580SR Service Manual page 946

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118 SECTION 55 - ELECTRICAL SYSTEM
4.5 BACKLIGHTING AND DIMMING
A proper and uniform backlighting for matrix, gauge
pointer and symbols shall be provided.
Separate backlighting electronics shall be provided
for matrix and symbols-gauge pointers. The back-
lighting will be achieved by LEDs and dimming shall
be provided through the setup menu selections.
The backlighting shall go at its maximum level when
the front, rear and driving lights are off.
The gauges backlighting dimming is switched on
when the cluster sees a HIGH level on front work
lights, rear work lights or driving lights for more then
100 ms.
The lamps intensity is decreased when side lights
are activated. The 2 different luminance levels are
defined as 100% during daytime use and 50% when
backlighting is active.
The display intensity of luminance will be 6 cd/m2
(not dimmed). The maximum available luminance
spread will be 30%. To avoid dark zones the maxi-
mum difference of intensity of luminance between
closed points is 15%. Note that the matrix backlight-
ing may go to 0 by customer selection. The lamps
and the audible alarm will warn the customer of an
alarm condition occurring.
DIMMING LAW
The dimming adjustment is done through the setup
menu, it can be used in single. In single step mode,
the luminance level go from min to max value in
10 steps.
The luminance levels of display and gauges always
varies in parallel.
The cluster switches between day and night lumi-
nance levels using the work and driving light status,
and is able to manage the display and gauges inde-
pendently using the same law and customer setting.
Only the night settings can be adjusted since the
day setting of the display is 100% intensity.
During dimming setup the matrix shows the dim-
ming symbol together with the percentage of lumi-
nance: its value varies using a step of 10%. The
dimming symbol appears when the proper menu is
selected and stays on the matrix for at least 2 sec-
onds.
The dot matrix visualization will be as follows:
The default value is 80% and the may go to zero if
set by the customer.