Nokia 3155 Rf Description And Troubleshooting

Also see for 3152: User guide Disassembly instructions User guide Troubleshooting Reassembly

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Nokia 3155 Rf Description And Troubleshooting Manual pdf 21 page image

Nokia Customer Care RF Description and Troubleshooting3155/3155i (RM-41), 3152 (RM-61)ISSUE 1 07/2005 ©2005 Nokia Corporation Company Confidential Page 214. 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 SMDissues 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 DetectorUse 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 withdefault output power.2. The output power at the RF test connector should read -32dBm peak +/- 4dB. Ifnot, follow the procedures above.3. Using a voltmeter on DC, probe the detector output at C7303. The voltmetershould read approximately 1.4V. If not, replace N7302.