User Guide

Issue 1 04/2005 COMPANY CONFIDENTIAL 15
Copyright © 2005 Nokia. All Rights Reserved.
RM-94
6(b) - RF Troubleshooting Nokia Customer Care
Yes
Signal Generator:
Level: –92dBm
Frequency: calculated from Phoenix
Phoenix:
SNR measurement ok?
(SNR > 18.37dB)?
No
Front end is ok.
Receiver
Fault Finding Tree
part 7
Phoenix:
open
SNR Measurement
Meas. Mode: Fast SNR
Press
Measure
.
Single band fault finding
Select faulty band in Phoenix and continue measurements on dedicated Rx part.
Signal Generator:
Level: –60dBm
Frequency: calculated from Phoenix
offset: 67.71kHz
Phoenix:
Phone: local mode
RF Controls
:
Active Unit: Rx
Op. Mode:
Continuous
Rx/Tx channel: default (mid)
AGC: 10
Continue with Rx Fault Finding part 6.
Spectrum Analyzer:
1)
Center Freq: calculated from Phoenix
RBW 20kHz
Change Rx SAW filters (Z7802,
Z7803) or component(s) of
matching network depending on
selected band
No
Yes
Note
1)
:
RF levels are dependent on RF probe and have to be validated
with a known good sample.
Receiver
Fault Finding Tree
part 8
Signal Generator:
To be tuned that input power at spectrum
analyser: –60dBm
power at probe:
Pref
=approx. -63dBm)
Frequency: calculated from Phoenix
offset: 67.71kHz
Phoenix:
Phone: local mode
RF Controls
:
Active Unit: Rx
Op. Mode:
Continuous
Rx/Tx channel: default (mid)
AGC: 14
Check Rx SAW filter and matching
network of selected band:
GSM900 TPs: INM_G_RX / INP_G_RX
both output levels > Pref -3.5dB ?
GSM1800 TPs: INM_D_RX / INP_D_RX
both output levels > Pref -6dB ?