User Guide

Nokia Customer Care RF Description and Troubleshooting
6255/6255i/6256/6256i (RM-19)
Issue 2 05/2005 ©2005 Nokia Corporation Company Confidential Page 23
4. Use an AAS-10 RF probe to probe the Cell Tx output of the N7000.
• If there is no RF or low RF, look for SMD everywhere around the N7000.
• If the SMD is okay, replace the N7000.
5. Probe the PA input.
• If the level is low, look for an SMD issue on the Tx filter or matching
transformer (T7001 or T7002).
• Reflow or replace the filter as necessary.
6. Probe the PA output.
• If the RF is missing or low, look for Vbatt voltages and SMD issues on and
around the PA.
• If these are okay, replace the PA.
7. Probe the duplexer output.
• If the RF is missing or low, reflow or replace the duplexer.
8. Probe the coupler output.
• If the RF is missing or low, reflow or replace the coupler.
9. Probe the diplexer output.
• If the RF is missing or low, reflow or replace the diplexer.
Failed Test: Tx PA Detector
Use the following steps if you encounter a failed test for the Tx PA detector:
1. Use Phoenix to set the mobile terminal into Local Mode and activate the Tx with
default output power.
2. The output power at the RF test connector should be 15dBm +/- 4dB. If not,
follow the procedures in the "Transmitter RF Troubleshooting Procedures" section
on page 22.
3. Using a voltmeter on DC, probe the detector output at C7313. The voltmeter
should read approximately 1.4V. If not, replace N7300. (See page 26 for test
point locations and common power and voltage variations.)