NSB-9
Troubleshooting Instructions
CCS Technical Documentation
Page 16
Nokia Corporation
Issue 1 04/03
Figure 4: Fault finding chart, RX1900
Check VCTCXO
output signal at TP20
26 MHz
Check VCTCXO
supply voltage at TP3
2.78 VDC
±
3%
9
8
Check VCTCXO
control voltage at
TP13
1.1 VDC
±
200 mV
8
9
Start baseband
troubleshooting (UEM)
8
Start baseband
troubleshooting (UEM)
Check RX signal at
antenna switch output
TP31
1960.067 MHz
9
8
Change antenna
switch Z500
Check RX signal at
dual filter output TP32
1960.067 MHz
9
8
Change dual filter
Z520
Check LNA voltages
at TP34 2.6 VDC
TP35 0 VDC
Check RX signal at
LNA output TP33
1960.067 MHz
9
8
8
9
Check LNA V550 and
other components
around it
If R551 is ok, change
Hagar ASIC N600
Check RX signal at
filter output TP36
1960.067 MHz
9
Change filter Z551
8
Apply input signal
1960.067 MHz
-50 dBm
9
Change VCTCXO
G660
9
DMM
OSC
DMM
SA
SA
SA
DMM
SA
Содержание NSB-9
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