Gsm1900 - Nokia 6600 Rf Troubleshooting And Manual Tuning Manual

NHL-10
RF Troubleshooting
1842.8 MHz, offset
from generator to
antenna connector
YES
Check RSSI using
EGSM chain
functional
Probe J606 -609
waveform look like
YES
Probe J211 &J212
Replace UPP

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.
ISSUE 2 01/2004
Figure 6: Fault finding chart for GSM1800
Apply -60 dBm
67.71 kHz
Phoenix Does it
m atch Sig Gen
Output level ?
NO
NO
Refer to
Is L.O running ? Synthesiser Fault -
finding chart
YES
Check RX/TX
NO
RX I &Q Does switch at RX 1800
exam ple given Input -63 dBm
earlier ? Output -65dBm
YES
Is digital data
visible
visable ?
NO
Spectrum analyzer
EGSM SAW filter
output -70 dBm
Replace UEM
Spectrum analyzer
Check signal after
inductors L603 and
Oscilloscope
VRX 2.7 V on
COMPANY CONFIDENTIAL
Copyright © 2003 Nokia. All Rights Reserved.
CCS Technical Documentation
Oscilloscope
NO
check Vc1, Vc2,
Z601
Vc3 at Z601 signal
Check RX/TX
YES
NO
Z602
YES
NO
L604
-73 dBm
YES
NO
Mjoelner
NO
Check Mjoelner
0V
switch
Check SAW filter
Z602
YES
Check inductors
L603, L604
Check Base band
15