User Guide

NPM-2NX
Troubleshooting CCS Technical Documentation
Page 30 ãNokia Corporation Issue 1 07/02
Step 1. General checking
Check signal level
at RX band filter
Z801 input
Check VR4 supply
and components if
these ok => replace
Safari N801
Not OK
OK
Check signal level
at mix1_A input, L809
Replace RX band
filter Z801
Not OK
OK
Check signal level
at IF filter Z803
input (134.04
MHz), R801
Not OK
OK
Start synthesizer
T
roubleshooting
(UHF VCO)
OK
Not OK
Check signal level at
IF filter Z803 output
(134.04 MHz), R802
Not OK
OK
Replace IF filter
Z803
Check signal level at
RX I/Q J808, J809,
J818, J819
Not OK
OK
Start synthesizer
T
roubleshooting
(RX VF`HF)
Check UEM and
start baseband
troubleshooting
Measure VR4 from
L812 and
L811pads
Check components
L812,
L811 etc.
Replace Safari N801
OK
Replace Safari N801
OK