Nokia 6600 Rf Troubleshooting And Manual Tuning Manual page 13

NHL-10
RF Troubleshooting
The input freq/level of the signal generator is 942.467710MHz, -60dBm.
942.4 MHz, offset
from generator to
antenna connector
YES
Check RSSI using
EGSM chain
functional
waveform look like
YES
Probe J211 &J212
Replace UPP
ISSUE 2 01/2004
Figure 5: Fault finding chart for GSM900
Apply -60 dBm
67.71 kHz
Phoenix Does it
match Sig Gen
Output level ?
NO
NO
Refer to
Is L.O running ? Synthesiser Fault -
finding chart
YES
Probe J606 -609 Check RX/TX
NO
RX I &Q Does switch at RX 900
example given
Input -63 dBm
earlier ?
Output -63dbm
YES
Is digital data
visible
visable ?
NO
Spectrum analyzer
EGSM SAW filter
output -66 dBm
Replace UEM
Spectrum analyzer
Check signal after
inductors L606 and
Oscilloscope
VRX 2.7 V on
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CCS Technical Documentation
Oscilloscope
NO
check Vc1, Vc2,
Z601
Vc3 at Z601 signal
Check RX/TX
YES
NO
Z604
YES
NO
L607
-66 dBm
YES
NO
Mjoelner
NO
Check Mjoelner
0V
switch
Check SAW filter
Z604
YES
Check inductors
L606, L607
Check Base band
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