Top Rf-Related Failures Seen In Flali - Nokia RM-11 Series Troubleshooting Manual

RM-11
Troubleshooting - RF

Top RF-related Failures Seen in FLALI

Test Failed
RF EX Self-test N701 VHF PLL
RF EX Self-test N601 VHF PLL CELL
RF MS Tx Start-up Amplitude
RFTN VCTCXO Frequency
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)
RF TN TX LIM Po IS95 CELL or PCS XX
RF TN TX DC Offset CS
RF MS RX IF AGC RXdbCtr(X)
RF MS LNA AMPS LowGain
RF MS LNA AMPS HighGain
RF MS LNA CELL LO LowGain
RF MS LNA CELL LM LowGain
RF MS LNA PCS xx LowGain
GPS MS Test Mode x (all tests)
© 2005 Nokia Corporation
Page 28
CC Technical Documentation
What to Check
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.
Perform Local Mode testing of the Tx VHF PLL on N601.
Check DC voltage (VIO, VR2, VR3, VR6). Probe Tx chain
in Local Mode.
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.
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.
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.
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.
If the parameter fails, check version of FLALI software
to ensure that it is the latest. Also verify that the
tuning limits are correct.
Inject signal and probe Rx chain for gain to key out any
failed parts.
Inject signal and probe Rx AMPS chain for gain to key
out any failed parts.
Inject signal and probe Rx Cell chain for gain to key
out any failed parts.
Inject signal and probe Rx PCS chain for gain to key
out any failed parts.
Check VL , V , V
NA_GPS CORE IO
Confidential
. RF Probe GPS chain.
Issue 2 09/2005