NHL-10
RF Troubleshooting CCS Technical Documentation
ISSUE 2 01/2004 COMPANY CONFIDENTIAL 15
Copyright © 2003 Nokia. All Rights Reserved.
Figure 6: Fault finding chart for GSM1800
GSM1900
• Start Phoenix Service Software and establish a connection to the phone.
• Select File -> Scan Product Ctrl R.
• Wait until the phone software version is shown in the lower part of the screen.
• Select Testing -> RF controls.
• Select Band -> GSM1900.
• Active unit -> RX.
• Operation mode -> Continuous.
• RX/TX channel -> 661.
• AGC -> 9.
Apply -60 dBm
1842.8 MHz, offset
67.71 kHz
from generator to
antenna connector
Check RSSI using
Phoenix Does it
match Sig Gen
Output level ?
Is L.O running ?
Check RX/TX
switch at RX 1800
Z601
Input -63 dBm
Output -65dBm
Oscilloscope
check Vc1, Vc2,
Vc3 at Z601 signal
0V
Spectrum analyzer
EGSM SAW filter
Z602
output -70 dBm
Spectrum analyzer
Check signal after
inductors L603 and
L604
-73 dBm
Check SAW filter
Z602
Oscilloscope
VRX 2.7 V on
Mjoelner
Check inductors
L603, L604
Check Base band
Check RX/TX
switch
Check Mjoelner
YES
YES
NO
NO NO
NO
NO
NO
YES
YES
EGSM chain
functional
Refer to
Synthesiser Fault -
finding chart
Probe J606 -609
RX I &Q Does
waveform look like
example given
earlier ?
Probe J211 &J212
Is digital data
visable ?
Replace UPP
Replace UEM
YES
YES
NO
YES
YES
NO
NO
visible
To Next Page
Loading...
