Nokia NPM-2NX Troubleshooting Manual page 35

CCS Technical Documentation
Check signal level
at RX band filter
Z802 input
Check signal level
at mix1_B input, L810
Continue
troubleshooting as
in
AMPS/TDMA800
Step 1. Local oscillator checking
Carrying out this step VCO signal of 1st and 2nd mixers can be checked. 2nd mixer RX
VHF VCO frequency is constant 268.08 MHz but for the 1st mixer UHF VCO frequency
depends on the channel. The UHF VCO frequencies for the 1st mixer are:
Channel 2:
Channel 1000:
Channel 1998:
1) Set signal generator frequency to 1960.0230375 MHz and level to -80 dBm.
2) Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Testing
Issue 1 07/02
Not OK
OK
Not OK
OK
2064.12 MHz
2094.06 MHz
2124.00 MHz
ãNokia Corporation
Troubleshooting
Check components
around lna and
measure supply
voltages
Replace RX band
filter Z802
NPM-2NX
Page 35