User Guide

NPE-4
6 - Troubleshooting PAMS Technical Documentation
Page 6-36 ãNokia Corporation. Original
Hagar
The balanced RX signal is mixed with a signal from the local oscillator at the same fre-
quency as the wanted RX signal. After mixing the signal is converted to a single ended
signal in the DtoS (Differential to Single ended) amplifier. The signal is now filtered in a
BIQUAD filter to provide channel separation, amplified in the BB_Gain amplifier and DC
compensated in DCN2.
EGSM Transmitter
General instructions for EGSM TX troubleshooting
Apply a RF-cable to the RF-connector to allow the transmitted signal to act as normal.
RF-cable should be connected to measurement equipment (GSM Test equipment, Power-
meter, Spectrum Analyzer, or similar) or to at least a 10-dB attenuator, otherwise the PA
may be damaged.
Connect the the phone to a PC with DAU-9P cable and dongle and follow the following
instructions:
Start Phoenix Service Software
Select File Alt-F
Scan Product Ctrl-R
Wait until phone information shows in the lower right corner of the screen.
Set operating mode to local mode
Select Maintenance Alt-M
Tuning T
RF Controls F
Wait until the RF Controls window pops up
Select Band GSM 900
Active unit TX
Operation mode Burst
RX/TX Channel 37
TX PA Mode Free
TX Power Level 10
TX Data Type Random