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CCS Technical Documentation
power level, for example 10. Set channel to 380 and press "Write Init".
4) Connect oscilloscope probe to one of the RX I/Q test points on PWB (all four testpoints
J808, J809, J818 and J819 are located behind display)
5) Check that there is a clean signal in each test points.
6) Decrease signal level slowly down to -115 dBm and make sure that AGC keeps signal
in visible (This can be noticed by looking at the RX I/Q voltage during signal level
change).
7) Measure and record the frequency and peak-to-peak voltage of RX I/Q signal from
each test points. Voltage should be around 100 mVp-p and frequency 6.5 kHz +/- 3 kHz.
TDMA800
Since there is same physical signal path for both analog (AMPS) and digital mode (TDMA)
in lower band there is no need for additional troubleshooting in digital mode. If digital
mode in lower band is not working properly start analog mode troubleshooting.
TDMA1900
Only path from external RF connector to IF needs to be checked if AMPS/TDMA800 RX
chain is OK. After down conversion (from RF to 134.04 MHz IF) both lower and upper
band use same signal path.
Issue 1 07/02
ãNokia Corporation
NPM-2NX
Troubleshooting
Page 33
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Table of Contents
Troubleshooting
