User Guide

Then connect the main battery and switch the phone ON. Monitor the voltage of the backup battery in order

to verify that the voltage will rise. After a few minutes switch the phone off and disconnect the main battery

and measure that the backup battery is charged. Typical behaviour of the backup battery voltage during

charge and discharge is described in the following pictures as a function of time.

Figure 40 Charging backup battery

Figure 41 Discharging backup battery

If the voltage rises and falls quickly, battery is dead. If the voltage stays 0V, check resistance VBACK<-> GND:

If there is no short circuit, Retu is faulty. Replace Retu.

Bluetooth troubleshooting

Introduction to Bluetooth troubleshooting

Bluetooth antenna is a conventional PWB antenna located beside the SIM card reader and it is not easily

damaged.

The antenna feed capacitor is the only BT component outside shielding cans. All other components are under

the can and BT ASIC is also underfilled, and thus cannot be repaired.

Malfunction in the BT ASIC, BT SMD components or in the baseband side is possible. This is unpredictable and

could have many causes i.e. SE or HW related.

Bluetooth settings for Phoenix

Steps

1. Start

Phoenix

service software.

RM-170; RM-171

Nokia Customer Care BB Troubleshooting and Manual Tuning Guide

Page 6 –26 COMPANY CONFIDENTIAL Issue 1