Nokia RH-21 Series Troubleshooting Manual page 24

RH-21
Troubleshooting
TDMA800
Since the same physical signal path is used for both analog and digital modes at the
lower band, there is no need for additional troubleshooting in the digital mode. So if the
digital mode at the lower band is not working properly, start the analog mode trouble-
shooting.
TDMA1900 (only dualband)
Only EXT RF connector –> 1
conversion (RF –> 135.54 MHz), both lower and upper band use the same signal path.
Apply 1960.02 MHz =
ch 1000 -110 dBm
signal to external
RF-connector X900.
Y
Enable loop back BER
using RF Test UI and
check sensitivity: -110
dBm BER < 3%
N
Check UHF Vc (from
C773) V: 2.2 ...2.6 V
Y
Check RXVHF Vc
(from C720). V: 0.7
...1.3
Y
Page 24
IF needs separate troubleshoot at upper band. After down
st
Figure 11: Fault tree, TDMA1900 troubleshooting
Y
TDMA1900
RX-chain is OK
N
N
Start synthesizer
troubleshooting
N
Start synthesizer
troubleshooting
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CCS Technical Documentation
Note!
These tests are done
in local mode by using
RF Test UI.
Issue 1 05/2003