Nokia RM-11 Series - RF Failure Analysis and Synthesizer Issues; FLALI RF Failure Analysis

RM-11
Troubleshooting - RF CC Technical Documentation
Page 28 ©2005 Nokia Corporation Confidential Issue 2 09/2005
Top RF-related Failures Seen in FLALI
Test Failed What to Check
RF EX Self-test N701 VHF PLL Perform Local Mode testing of Rx VHF PLL on N701.
Check that voltage levels at VR5 and VR7 are 2.7V.
Also, check UHF LO level into N750.
RF EX Self-test N601 VHF PLL CELL Perform Local Mode testing of the Tx VHF PLL on N601.
Check DC voltage (VIO, VR2, VR3, VR6). Probe Tx chain
in Local Mode.
RF MS Tx Start-up Amplitude Check status of soldering on the balun presence of UHF
LO. Check gain of PA and driver amplifier. Driver should
have 12-16dB gain and PA should have 24-28dB gain.
RFTN VCTCXO Frequency Measure VR3, VR1A voltage and probe for 19.2MHz
output of VCTCXO. Next, check if Tx VHF PLL is on
frequency. If previous tests are good, probe Tx chain in
Local Mode.
RF TN TX IF AGC CELL or PCS Po(X)
RF TN TX PA AGC CELL or PCS Po(X)
RF TN TX RF AGC CELL or PCS Po(X)
Visually check soldering of the N601 (x-ray),
supporting components, and PA. Also check D400,
which generates the PDM signals. Troubleshoot the
rest of the Tx chain in Local Mode.
RF TN TX LIM Po IS95 CELL or PCS XX If the max Tx power cannot be reached, either a
component in the transmitter has too much loss or not
enough gain. Troubleshoot the corresponding Cell or
PCS transmitter in Local Mode.
RF TN TX DC Offset CS If the parameter fails, check version of FLALI software
to ensure that it is the latest. Also verify that the
tuning limits are correct.
RF MS RX IF AGC RXdbCtr(X) Inject signal and probe Rx chain for gain to key out any
failed parts.
RF MS LNA AMPS LowGain
RF MS LNA AMPS HighGain
Inject signal and probe Rx AMPS chain for gain to key
out any failed parts.
RF MS LNA CELL LO LowGain
RF MS LNA CELL LM LowGain
Inject signal and probe Rx Cell chain for gain to key
out any failed parts.
RF MS LNA PCS xx LowGain Inject signal and probe Rx PCS chain for gain to key
out any failed parts.
GPS MS Test Mode x (all tests) Check VL
NA_GPS
, V
CORE
, V
IO
. RF Probe GPS chain.