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NPL-4/5/RM-104
Troubleshooting Instructions
Transmitter
General instructions for transmitter 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
•
DAU-9T cable (RS232) or
•
DKU-5 cable (USB).
Connect the phone to a power supply (DC voltage of 3.9V) and switch the phone on.
The value of the DC voltage of 3.9V at the phone battery connector is crucial.
Attention: When repairing or tunning transmitter use external DC supply with at least 3A
current capability.
Connect an RF cable between the test jig and the measurement equipment (GSM test
equipment, 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.
Start Phoenix Service Software and open FBUS connection:
Select->Scan Product->Ctrl-R
and wait until phone information is shown in the lower right corner of the screen.
Follow the instructions in the chapters below.
Transmitter troubleshooting
Antenna switch (TX/RX switch)
The antenna switch operates as a diplexer for the RX and TX signals. Moreover, it sup-
presses the TX harmonics generated by the PA. The antenna switch is a controlled by the
RF ASIC using the control signals VANT1, VANT2 and VANT3.
The table below shows the possible different switching states.
Copyright © 2005 Nokia Corporation. All rights reserved.
Page 28
Company confidential
Nokia Customer Care
Issue 2 05/05
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Table of Contents
Troubleshooting
