Failed Test: Tx Pa Detector - Nokia 3155 Rf Description And Troubleshooting

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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 discrete balun.
• Reflow or replace the filter as necessary.
6. Probe the PA output.
• If the RF is missing or low, look for Vbatt voltages, Vcc PA 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 read -32dBm peak +/- 4dB. If
not, follow the procedures above.
3. Using a voltmeter on DC, probe the detector output at C7303. The voltmeter
should read approximately 1.4V. If not, replace N7302.
ISSUE 1 07/2005
©2005 Nokia Corporation
3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting
Company Confidential Page 21