Transmitter; General Instructions For Tx Troubleshooting; Gsm900 Transmitter; General Instructions For Gsm Tx Troubleshooting - Nokia RH-37 Series Rf Troubleshooting Instructions

Nokia Customer Care

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

The GSM900 chapters apply only for RH-37 (EU variant).

General instructions for GSM TX troubleshooting

Start the preparations as described in chapter "General instructions for TX troubleshoot-
ing".
Issue 1 07/04
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