Gsm1900 - Nokia NPM-2NX Troubleshooting Manual

NPM-2NX
Troubleshooting
=> RF Test).
3) Set channel to 1000 and press "Write Init".
4) Set spectrum analyzer settings as following:
- Center frequency: 268.08 MHz, Span: 200 kHz
- RBW: 3 kHz, reference level: 0 dBm
5) Connect spectrum analyzer probe on the inductor L818 and record RX VHF VCO signal
level and frequency. Signal level should be around -25 dBm and frequency 268.08 MHz.
6) Set spectrum analyzer settings as following:
- Center frequency: 2094.06 MHz, Span: 200 kHz
- RBW: 3 kHz, reference level: 10 dBm
7) Connect spectrum analyzer probe to testpoint J813 and record UHF VCO signal level
and frequency. Signal level should be around -5 dBm and frequency 2094.06 MHz.
8) Repeat measurement for channels 2 and 1998.

GSM1900

Fault finding chart
Page 36 ãNokia Corporation
CCS Technical Documentation
Issue 1 07/02