Troubleshooting Chart For Pcs Receiver - Nokia NPM-10 Series Troubleshooting Instructions

NPM-10
Troubleshooting Instructions RF

Troubleshooting Chart for PCS Receiver

1
Apply -55 dBm
1960 MHz,
1
offset 67.71 kHz
from generator to
antenna connector
YES
Oscilloscope at
RX I/Q signal
2 416 mVpp
DC offset 1.35 V
freq. 67.68 kHz
YES
PCS chain
3
functional
4
5
6
By measuring with an oscilloscope at RXIP or RXQP on a working GSM1900 receiver, the
following picture should be seen.
Signal amplitude peak-peak 416 mV
DC offset 1.35 V
Page 18
2
NO
Check
Antenna switch
at RX 1900 Z700
-58 dBm
YES
Spectrum analyzer
PCS SAW filter
Z601
output -66 dBm
YES
Spectrum analyzer
Check signal after
inductors L611 and
L601
-66 dBm
YES
Oscilloscope
VRX 2.7 V
check Mjoelner
serial interface
Figure 10: GSM1900 receiver troubleshooting chart
Nokia Corporation
CCS Technical Documentation
3
NO Oscilloscope
check VANT1 and
VANT2 at Z700
signal 0V
YES
Check
Antenna switch
NO
Check SAW filter
Z601
NO
Check inductors
L611, L601
NO
Check Base band
Confidential
4
NO
Check Mjoelner
YES
Issue 1 03/2003