User Guide

Figure 109 High voltage regulator circuit

Power LED

In order to save current and increase the standby time, the phone provides an extra power saving mode

where both displays will be switched off after a certain time of user inactivity. A low frequently blinking LED

will indicate, that the phone is still alive (no empty battery).

The LED is located in the lid part adjacent to the cover UI display. In order to save the signal count on the

engine-lid interface, a high side driver is used. The current through the LED is limited to ~2mA. The driver

will be enabled by RAPIDO high active GENIO 54.

RM-135

Nokia Customer Care System Module and User Interface

Page 7 –28 COMPANY CONFIDENTIAL Issue 1