Receiver Fault Finding - Nokia NEM-4 Series Troubleshooting Instructions

NEM-4
RF Troubleshooting
Select
Wait until the RF Controls window pops up
Select
Following picture should be seen on a working EGSM receiver:
Signal amplitude
DC offset
Frequency

Receiver fault finding

Set up Phoenix as if doing RSSI measurements.
Ascertain which Rx band is faulty.
Refer to Rx fault finding flow chart.
Set signal generator frequency to 942.47MHz for EGSM, 1842.87MHz for DCS 1800 or
1960.07MHz for PCS 1900.
Set signal generator amplitude to -60dBm.
Note:That checking the RF inputs to SAW filters Z602, Z603 & Z604 will be extremely difficult with
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Company Confidential
Testing
RF Controls
Band
Active unit
Operation mode
RX/TX Channel
AGC
1.25V
1,35V
67kHz
Copyright  2003 Nokia Corporation
Company Confidential
CCS Technical Documentation
alt-S
R
GSM 900 or GMS1800 or GSM1900
RX
continuous
37 or 700 or 661
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Issue 1 09/2003