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NSM–5
UI section
PAMS Technical Documentation
Page 12
Issue 1 02/2002
Nokia Corporation
Power Key
Micro switch is used as a power key on UI module. Circuitry includes mi-
cro switch and two diodes which is needed for MAD interface. Power key
is connected to CCONT. Power switch is active in LOW state. Power key
is connected to ROW4.
Backlighting
Switching circuits for backlighting are placed on UI module. Display and
keyboard lighting is connected together. When LIGHT–signal is HIGH the
lights are on and when LIGHT–signal is LOW state lights are off.
Backlighting is made by LEDs, three LEDs on the bottom of the display.
Light is on when LIGHT–signal is in HIGH state.
In keyboard backlighting is made by 8 LEDs. Backlighting is on when
LIGHT–signal is on HIGH state.