Nokia 6235 Troubleshooting Manual

Also see for 6235: User guide User guide User guide Disassembly/Assembly Antenna Description and Troubleshooting

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Nokia 6235 Troubleshooting Manual Manual pdf 66 page image

6235/6235i/6236i (RM-60)RF Description and TroubleshootingPage 66 ©2005 Nokia Corporation Company Confidential Issue 1 04/2005FM Radio Troubleshooting SetupUse the following steps to troubleshoot the FM radio while using a Pop-port headset.1. Connect the Pop-port headset (HDS-3) to the Pop-port connector (bottomconnector).2. Select the Menu > Media > Radio from the mobile terminal user interface.3. In an FM radio broadcast coverage area, set a local radio channel by scanningautomatically using the Automatic tuning option. (Scanning up and down thechannels by pressing the “Up” and “Down” key respectively).4. If no channel could be found, inspect all the components in the FM radiocircuitry.• If the circuits pass a visual inspection, check the existence of the LO (byradiative pickup) near the VCO of the FM Radio IC.• If no LO is found, replace the FM radio IC.5. Listen for sound out of the headset.• If there is a signal present, continue to step 6.• If there is no static sound present, inspect all FM Radio circuits on the PCBand refer to the “Audio” section of the Baseband Description andTroubleshooting chapter for more information.6. Disconnect the Pop-port headset and connect the universal headset to the UHJ(top connector).7. With the universal headset connected, repeat steps 1—5.• If there is a signal present, the FM Radio is working properly.• If there is no static sound present, refer to the “Audio” section of theBaseband Description and Troubleshooting chapter for more information.FM Radio Part Layouts and Probe PointsUse the following values when probing the LO near the VCO of the FM radio IC (N6100).See Figure 68 for the location of the N6100.For example, if the Rx frequency is 87.5 and the IF frequency is 225kHz, the LO equals175.45MHz [(87.5+0.225)*2 = 175.45MHz].Table 9: FM Radio Test Point ValuesDescription ValueLO frequency (Rx frequency + IF frequency) x 2IF frequency 225kHz

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