Naviwheel Illumination (Power Led) - Nokia n81 Service Manual

RM-179; RM-223
System Module and User Interface
Figure 70 ITUT keyboard and side key backlight

NaviWheel illumination (power LED)

The NaviWheel illumination has three LEDs in parallel and driven in two modes: S60 and Power-Save mode.
In S60 mode driving current is 15mA with gives 5mA per LED. It is activated whenever S60 LEDs of menu
keyboard are activated. In this mode dimming is not supported.
In order to save current and increase the standby time, the phone provides an extra power saving mode
where the display will be switched off after a certain time of user inactivity. A low frequently blinking
NAVIWheel will indicate, that the phone is still alive (no empty battery). In Power-Save mode driving current
is 6mA which will lead to 2mA per LED.
Page 6 –30 COMPANY CONFIDENTIAL Issue 1
Copyright © 2007 Nokia. All rights reserved.