Keyboard Interface; Backlight And Illumination - Nokia RM-509 Service Manual

RM-509; RM-510; RM-511
System Module

Keyboard interface

Figure 39 Keypad matrix

Backlight and illumination

The illumination has four main areas: numeric keypad (2 x white LEDs), functional keypad (2 x white LEDs),
display backlight (4 x white LEDs) and hinge illumination (2 x LEDs). The display backlight is powered by the
integrated DC/DC converter of the Pearl/Gazoo IC. In addition to these LEDs, the two functional keypad LEDs
and numeric keypad LEDS are powered via a current mirror from the Pearl/Gazoo .
There is also a camera flash LED.
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