Nokia NEM-4 Series Troubleshooting Instructions page 71

CCS Technical Documentation
the Mjoelner Can Shield in place. If this is impossible to get to, try checking the test points shown on
the antenna switch Z601.
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?
Connector.
OK?
YES NO
Replace
SAW Filter
Replace Replace RF
Antenna Connector
Switch
Check
NO
L701, L702
L703. OK?
YES
KEY
Issue 1 09/2003
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  2003 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
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
NEM-4
RF Troubleshooting
YES
NO
YES
YES
Probe J211 &
NO
J212. Is digital
data visible?
Replace UEM
NO
Receiver is working
correctly.
Page 6(b)-67