Table of Contents
Advertisement
RH-13
Troubleshooting
TDMA800
Since there is same physical signal path for both analog (AMPS) and digital modes
(TDMA/GSM) in lower band there is no need for additional troubleshooting in digital
modes. If digital mode in lower band is not working properly start analog mode trouble-
shooting.
GSM850
Apply signal to ext.
antenna connector
f= 881.46771 MHz
(ch 189)
unmodulate
level= -80 dBm
Check signal level
at RX I/Q J808,
J809, J818, J819
Not OK
Check signal level
at diplexer Z908
input
Check signal level
at duplex filter
Z906 input
Check signal level
At LNA_a input
coil pad (L802)
Page 36
Figure 18: Fault finding chart.
OK
Not OK
OK
Not OK
OK
Not OK
OK
ãNokia Corporation
CCS Technical Documentation
GSM850 RX is
OK
Replace external
antenna connector
Replace diplexer
Replace duplex
filter Z906
X900
Z908
Issue 1 11/02
Advertisement
Table of Contents
Troubleshooting
