User Guide

RM-94

Nokia Customer Care 6(b) - RF Troubleshooting

18 COMPANY CONFIDENTIAL Issue 1 04/2005

Transmitter

■ General instructions for TX troubleshooting

Connect the phone to a PC, which has Phoenix Service Software and a dongle installed, using

either

• repair jig and DAU-9S (RS232) cable or

• repair jig and XCS-4 cable via FPS-8 Flash Box or

• DAU-9T cable (RS232)

Connect the phone to a power supply (DC voltage of 3.6V) and switch the phone on. The value

of the DC voltage of 3.6V at the phone battery connector is crucial.

Connect an RF cable between the test jig and the measurement equipment (GSM test equip-

ment, power meter, spectrum analyzer, or similar).

Make use of an adequate attenuator at the input of your measurement equipment (10dB to

20dB are recommended for a spectrum analyzer or a power meter). Additionally, a DC block is

recommended. Assure not to overload or destroy the equipment.

It is strongly recommended to use TXP as external trigger for all TX tunings. External triggering

gives the following advantages:

• trigger for spectrum analyzer (gated sweep)

• trigger for oscilloscope

• trigger for power meter (avoid exchanging of attenuator and getting better accu-

racy in power measurements)

Start Phoenix Service Software and open FBUS connection:

Select Scan Product Ctrl-R

and wait until the phone information is shown in the lower right corner of the screen.

Follow the instructions in the chapters below.

■ GSM900 transmitter

General instructions for GSM900 TX troubleshooting

Start the preparations as described in chapter “General instructions for TX troubleshooting”.

GMSK

Set operating mode to local mode.

Select Testing RF Controls

Wait until the RF Controls window pops up

Select Band GSM 900

Active unit TX