User Guide

CCS Technical Documentation Troubleshooting
NPM-2NX
Issue 1 07/02 ãNokia Corporation Page 29
AMPS
Fault finding chart
Apply signal to ext .
antenna connector
f= 881.4 MHz ch 380)
mod.= 1004
dev .= 8 kHz
level= -116 dBm
Connect audio box
from the bottom
connector to audio
Analyzer
AMPS RX is OK
SINAD > 12 dB
SINAD < 12 dB
Apply signal to ext .
antenna connector
f=881.4091125MHz
(
ch 380)
unmodulate
level= -50 dBm
Check signal level
at diplexer Z908
input
Replace external
antenna connector
X
900
Not OK
OK
Check signal level
at duplex filter
Z906 input
Replace diplexer
Z908
Not OK
OK
Check signal level
at LNA_a input
coil pad (L802)
If coil L802 is ok
replace duplex
filter Z906
Not OK
OK