Nokia NSB-9 Service Manual page 187

CCS Technical Documentation
Apply input signal
881.667 MHz
-50 dBm
Check VCTCXO
output signal at TP20
26 MHz
Check RX signal at
antenna switch output
TP63
881.667 MHz
Check RX signal at
dual filter output TP64
881.667 MHz
Check RX signal at
LNA output TP66
881.667 MHz
Check RX signal at
filter output TP68
881.667 MHz
Issue 1 04/03
Figure 3: Fault finding chart, RX850
Check VCTCXO
supply voltage at TP3
2.78 VDC ± 3%
Check VCTCXO
control voltage at
TP13
OSC 1.1 VDC ± 200 mV
Change VCTCXO
G660
SA
SA
Check LNA voltages
at TP65 1 VDC
TP67 2.6 VDC
SA
Check LNA V500 and
other components
around it
Change filter Z501
SA
Nokia Corporation
Troubleshooting Instructions
Start baseband
troubleshooting (UEM)
DMM
DMM
Start baseband
troubleshooting (UEM)
Change antenna
switch Z500
Change dual filter
Z520
If R501 and R502 are
ok, change Hagar
ASIC N600
DMM
NSB-9
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