Nokia NSB-9 Service Manual page 190

NSB-9
Troubleshooting Instructions
Apply input signal
1960.067 MHz
-50 dBm
Check VCTCXO
output signal at TP20
26 MHz
Check RX signal at
antenna switch output
TP31
1960.067 MHz
Check RX signal at
dual filter output TP32
1960.067 MHz
Check RX signal at
LNA output TP33
1960.067 MHz
Check RX signal at
filter output TP36
1960.067 MHz
Page 16
Figure 4: Fault finding chart, RX1900
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 TP34 2.6 VDC
TP35 0 VDC
SA
Check LNA V550 and
other components
around it
Change filter Z551
SA
Nokia Corporation
CCS Technical Documentation
Start baseband
troubleshooting (UEM)
DMM
DMM
Start baseband
troubleshooting (UEM)
Change antenna
switch Z500
Change dual filter
If R551 is ok, change
Hagar ASIC N600
DMM
Z520
Issue 1 04/03