User Guide

6015/6015i/6016i/6019i (RH-55), 6012 (RM-20)

Troubleshooting - Baseband Nokia Customer Care

•Vibra

• Display and keyboard lights

The UEM is the heart of the power distribution to the phone, which includes all the

voltage regulators. The UEM handles power-up hardware functions so the regulators are

not powered and the power-up reset (PURX) is not released if the battery voltage is less

than 3 V.

The baseband is powered from five different UEM regulators:

Table 2 includes the UEM voltage regulators used by the RF.

A charge pump used by VR1A is constructed around the UEM. The charge pump works

with Cbus (1.2 MHz Clk) and gives a 4.75 V regulated output voltage to the RF.

Table 1: Baseband Regulators

Regulator

Maximum

Current (mA)

Vout (V) Notes

VCORE

DC/DC

300 1.35 The power-up default value is 1.35V. The output voltage is

selectable: 1.0V/1.3V/1.5V/1.8V.

VIO 150 1.8 Enabled always except during power-off mode

VFLASH1 70 2.78 Enabled always except during power-off mode

VFLASH2 40 2.78 Enabled only when data cable is connected

VANA 80 2.78 Enabled only when the system is awake (off during sleep

and power-off modes)

VSIM 25 3.0 Enabled during power-up mode and scanning for a SIM

card

Table 2: RF Regulators

Regulator

Maximum

Current (mA)

Vout (V) Notes

VR1A 10 4.75 Enabled when the receiver is on

VR1B 10 4.75 Enabled when the transmitter is on

VR2 100 2.78 Enabled when the transmitter is on

VR3 20 2.78 Enabled when SleepX is high

VR4 50 2.78 Enabled when the receiver is on

VR5 50 2.78 Enabled when the receiver is on

VR6 50 2.78 Enabled when the transmitter is on

VR7 45 2.78 Enabled when the receiver is on