User Guide

NPE-4
6 - Troubleshooting PAMS Technical Documentation
Page 6-34 ãNokia Corporation. Original
Measuring with an oscilloscope on “Hagar RXI” or “Hagar RXQ” this picture should be
seen on a working PCN receiver:
Signal amplitude 1.5V
DC offset 1,1V
Frequency 67kHz
If this picture is not seen, then go to section 6.2 of this document for troubleshooting.
Fault finding chart for PCN receiver
Apply -80dBm
1842.867MHz signal
from generator to
antenna connector
Oscilloscope at RXIINP
Signal 1.5Vpp
DC offset 1.1V
Frequency 67.7kHz
PCN chain functional
Oscilloscope
VR4 2.7V
Check Hagar serial
interface
Yes
Yes
Yes
Spectrumanalyzer
V810, RFout
-72dBm
No No
Spectrumanalyzer
DUAL SAW
(Z804) PCN out
-92dBm
Spectrumanalyzer
DUAL SAW
(Z804) PCN in
-91dBm
No
Spectrumanalyzer
Z610 input
-75dBm
Check
C814
No
Yes
Check Hagar
N600
Yes
Check BBNo
Oscilloscope
LNAC_1800
2.4-2.8V
LNAB_1800 0V
Yes
Check RX/TX
Switch
Z802
No
Check Z804
Yes
No
Oscilloscope
V810, RFout 2.1-2.2V
V810, RFin 0.8-0.9V
Yes
Oscilloscope
VR4 2.7V
Check Hagar serial interface
Check Hagar
N600
Yes
Check BaseBandNo
Check
R812,R813,R818,
V810,C811,C812,
C818, L812
No
Check
V810
Yes
Change generator
level to -55dBm
Yes
PCN RX Fault finding Tree