User Guide

Table 10 Cover UI keys

GENIO 38 GENIO 39 GENIO 40

GND S1000/REW S1001/Play S1002/FF

Backlight and illumination

Display and cover UI key illumination

Phone illumination diagram for both displays and cover keys is shown in figure below. The external regulator

is controlled by Betty. It drives either the main display or both cover UI display and cover UI LEDs at the same

time. This depends on the GENIO28 state, controlled by Rapido. The current is limited by the feedback

regulator resistor. It is set to 18mA.

Figure 108 Illumination overview

Keyboard illumination

In order to get the required thickness, the keyboard is illuminated by EL foil instead of LEDs. The EL foil is

flexible and located between keydomes and the keymat. It is based on electroluminescent material: this

emits light if electrostatic field is caused by high voltage AC. It means a special regulator is needed. Handle

it with care!

Note: To avoid electrostatic shocks don’t touch regulator circuit if EL foil emits light!

RM-135

System Module and User Interface Nokia Customer Care

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