Nokia RH-37 Series Rf Troubleshooting Instructions page 16

RH-37
6(b) - RF Troubleshooting Instructions
Select faulty band in Phoenix and continue measurements on dedicated Rx part.
Phoenix:
open SNR Measurement
Meas. Mode: Fast SNR
Press Measure .
Signal Generator:
Level: –92dBm
Frequency: calculated from Phoenix
Phoenix:
SNR measurement ok?
(SNR > 18.37dB)?
No
Phoenix:
Phone: local mode
RF Controls :
Active Unit: Rx
Op. Mode:
Continuous
Rx/Tx channel: default (mid)
AGC: 14
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
Spectrum Analyzer:
Center Freq: calculated from Phoenix
RBW 20kHz
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 ?
Yes
Page 16
Single band fault finding
Front end is ok.
Yes
Phoenix:
Phone:
RF Controls :
Active Unit:
Op. Mode:
Rx/Tx channel:
AGC:
Signal Generator:
Level:
Frequency:
Continue with Rx Fault Finding part 6.
1)
Change Rx SAW filters (Z7802,
Z7803) or component(s) of
No
matching network depending on
selected band
Nokia Corporation
Nokia Customer Care
local mode
Rx
Continuous
default (mid)
10
–60dBm
calculated from Phoenix
offset: 67.71kHz
1)
Note :
RF levels are dependent on RF probe and have to be validated
with a known good sample.
Receiver
Fault Finding Tree
part 7
Receiver
Fault Finding Tree
part 8
Issue 1 07/04