Receiver Rf Test Points - Nokia 7088 Troubleshooting Manual

Nokia Customer Care

Receiver RF Test Points

For the test points in Figure 13, an external signal source of –25 dBm was injected
to the RF input. Set LNA GAIN STATE to 3 .The signal would then be traced
throughout the receiver chains. An CMU200 call box is recommended. (Open
non-signaling mode, press the SG soft button, and then select CW.) Inject a
continuous wave (CW) for Cell (881.52MHz) at a fixed –25 dBm power level.
Measurements would be taken with the RF Probe. Signal levels are approximate
and the accuracy may be +/- 2 dB or more depending on the probe position and
grounding.
Figure 13: Receiver RF troubleshooting test points
Table 5 includes the descriptions and values for Rx RF troubleshooting test points
shown in Figure 13.
Test Point Description
1 LNA IN
2 RX SAW INPUT
3 RX SAW OUTPUT
Issue 1 11/2006
3
Table 5: Rx RF Test Points
© 2006 Nokia Corporation
RF Description and Troubleshooting
2
Value
-27dBm
-47dBm
-50dBm
Company Confidential
7088 (RM-219)
1
Page 17