Step 3. Rx Chain Checking - Nokia RH-13 Series Troubleshooting Manual

CCS Technical Documentation
• RBW: 3 kHz, reference level: 10 dBm
7 Connect spectrum analyzer probe to the UHF VCO output and record signal level
and frequency. Signal level should be around -5 dBm and frequency 2030.88
MHz.
8 Repeat measurement for channels 991 and 799.

Step 3. RX chain checking

1 Set signal generator frequency to 881.4091125 and level to -50 dBm.
2 Set phone to TDMA mode and select RF Test UI in Phoenix (Maintenance => Test-
ing => RF Test).
3 Make sure that signal generator allows phone TX power going to its output. Use
low 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 sig-
nal 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.
Issue 1 11/02
Output
G802
ãNokia Corporation
RH-13
Troubleshooting
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