User Guide

CCS Technical Documentation RF Troubleshooting
Company Confidential NHM-10
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START
Is EGSM
TXIN signal
at R805 OK?
Check Z701 &
Biasing components
NO
Is Signal at
C733 OK?
Is signal at
L807 OK?
YES
Are TX I & Q on
C715 & C716. OK?
Are digital I & Q
signals OK on
J123 & J214?
Change
Mjoelner
Are TXP &
TXC visible?
Change
UPP
Change
UEM
NO
TXC
NO
TXP
Is VR2
2.8V on
C731?
Is VTXB
_900 OK?
Is Signal at V802
Collector OK?
Check / Replace
R805, C820, C821
Check V802 &
associated components
Is Signal
at C834
OK?
Probe VPD_900Signal
on R818 and set Power
Level to 19 using Phoenix.
Is Pulse Pk-Pk 2.8V?
Replace PA
Is Signal at
TX_GSM on
L801 OK?
Change
L801
Check Antenna
Switch Control
Lines. Do they
match the results
in the table?
Check L701,
L702 & L703.
OK?
Replace
Inductors
Is Signal at
Antenna pin
of Z601 ok?
Change X602
RF Connector
Change
Antenna
Switch
Test using
Spectrum Analyzer
Test using
Oscilloscope
Check /
Inspect
End
Action
KEY
YESYESNO NO NO
YES
NO
YES
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES NO
YES
NO
NO
YES
NO YES
YES
NO
Is Signal at
TX_850_OUT
on L801 OK?
Is Signal
at C881
OK?
START
Is 850
TXIN signal
at R828 OK?
Is Signal at
R733 OK?
Probe VPD_850 Signal
on R818 and set Power
Level to 19 using Phoenix.
Is Pulse Pk-Pk 2.8V?
Is VTXB
_850 OK?
Check / Replace
R826,R827,R828,
C820,C821
Check L703
and L813 OK?