Receiver Troubleshooting - Nokia RH-29 Series Manual

RH-29
6b - RF Troubleshooting

Receiver troubleshooting

Set up Phoenix as if doing RSSI measurements.
Ascertain which Rx band is faulty.
Refer to Rx troubleshooting flowchart.
Set signal generator frequency to 942.46771MHz for EGSM900 or 1847.86771MHz for
DCS1800.
Set signal generator amplitude to -60dBm.
Select Receive Band
For Testing.
Check Antenna
Check Antenna
Switch Cont.
NO
Switch Test Point.
lines. Do they
Signal OK?
match the results
in the table?
YES NO
Check PI Filter & SAW
Inspect RF
Components. OK?
C650.
Connector.
OK?
YES NO
Replace
SAW Filter
Replace Replace RF
Antenna Connector
C650.
Switch
Check
NO
L701, L702
OK?
L703. OK?
.
YES
KEY
Page 14
Company Confidential
Check SAW
NO
Output / Mjoelner
Input for band. OK?
YES
NO
Measure Vge at
same point. 0.2V?
YES
Inspect PI filter &
SAW for S/c. S/C?
Replace all 3
YES
Components
Replace Rectify S/C
Inductor
Test With Test With
Spectrum Analyzer Oscilloscope
Copyright © 2004 Nokia Corporation
Company Confidential
Check RSSI using Phoenix.
Does it match Sig. Gen Output level?
NO
Refer to Synth.
Is LO Running?
Flow Chart.
Probe J606-609 for RX I & Q
NO
Does Waveform
look like example?
YES
YES
Probe J200 and J202, is
digital data visible?
NO
YES
Replace UPP
NO
Check Mjoelner
Voltage Supplies &
RFBUS lines.
All OK?
YES
Refer to BB
Replace
Fault Finding
Mjoelner
Inspect /
End
Check
Action
Nokia Customer Care
YES
NO
YES
YES
YES
Probe J211 &
NO
J212. Is digital
data visible?
Replace UEM
NO
Replace
UEM.
Receiver is working
correctly.
Issue 1 05/2004