Receiver Diagnostic Signal Tracing - Nokia 6255 Rf Description And Troubleshooting

6255/6255i/6256/6256i (RM-19)
RF Description and Troubleshooting
Figure 34: PCS spectrum and the test points on the top side of the main PWB

Receiver Diagnostic Signal Tracing

Use the following steps to trace the receiver signal.
1. Inject an external signal source of –25dBm to the RF input. An Agilent call box
8960 is recommended.
2. Press the Call Setup button, press the Active Cell soft button, and select CW.
3. Inject a CW signal for PCS (1960MHz) or Cell/AMPS (881.52MHz) at a fixed
-25dBm power level.
4. Use an AAS-10 probe to take measurements. Signal levels are approximate, and
accuracy may be +/- 2dB or more depending on the position and grounding of
the probe.
Page 42
©2005 Nokia Corporation
Rx_IP
Rx_IN
Company Confidential
Nokia Customer Care
Rx_QP
Rx_QN
Issue 2 05/2005