Nokia 2220 Servicehandbuch

CCS Technical Documentation

Troubleshooting Instructions

RH-42

Issue 2 09/2003

Nokia Corporation Confidential

Page 5

Transceiver Troubleshooting

First, carry out a thorough visual check of the module. Make sure that:

• there is no mechanical damage

• the solder joints are OK

Note: Before changing anything, ALL SUPPLY VOLTAGES AND THE SYSTEM CLOCK / SLEEP
CLOCK should be checked.

Baseband Troubleshooting

General testing

The phone has three different modes for testing and/or repairing the phone. The modes
can be selected with suitable resistors connected to BSI- and BTEMP- lines as illustrated
in the following table:

If the corresponding resistors are connected, the MCU software automatically enters into
the local or test mode when the supply voltage is connected to the phone.

The power can be switched on by:

1 Pressing the power key.

2 Connecting the local/test mode resistors to the bsi/btemp lines and connecting

the battery voltage to the phone.

3 Connecting a charger.

4 Phone’s internal functions (Real time clock alarm)

In the local and test mode, the baseband can be controlled through MBUS or FBUS (FBUS
is recommended) connections using Phoenix service software.

Troubleshooting

Note: Most of the baseband repair actions require removing the baseband shield. The shield must not
be removed unless separately authorized by the program.

Note: The phone’s ESN has to re-written to the UEM, if the UEM is replaced. This can be done only in
Central Service.

Mode

BSI-resistor

BTEMP resistor

Remarks

Local mode

0 - 1k

Test mode

>1k

0 - 1k

Normal mode

68k

47k

Recommended for baseband
testing. Same as local mode, but
making a phone call is possible.