Service Manuals, User Guides, Schematic Diagrams or docs for : NOKIA Mobile Phone 3520 7-rh21-trouble

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                    Nokia Customer Care
                  RH-21 Series Transceivers




                   Troubleshooting




Issue 2 07/2004            2004 Nokia Corporation.   Page 1
                         Company Confidential
RH-21               Company Confidential
Troubleshooting                              Nokia Customer Care




Page 2             2004 Nokia Corporation.          Issue 2 07/2004
                                                       Company Confidential                                       RH-21
Nokia Customer Care                                                                                        Troubleshooting

Contents
                                                                                                                              Page No
  Troubleshooting ............................................................................................................. 5
   Baseband Troubleshooting ..........................................................................................5
     General testing information....................................................................................... 5
     Troubleshooting ........................................................................................................ 6
     Phone does not start up normally or does not stay on............................................... 8
     Flash Programming does not work.......................................................................... 10
     Charging .................................................................................................................. 12
     Audio failures.......................................................................................................... 13
     Accessory detection................................................................................................. 15
     Sleep Clock ............................................................................................................. 16
     User Interface .......................................................................................................... 18
   Receiver Troubleshooting ..........................................................................................20
     General Instructions for RX troubleshooting .......................................................... 20
     Path of the received signal ...................................................................................... 20
     Fault-finding charts for receiver chain .................................................................... 21
   Transmitter fault-finding ...........................................................................................29
     General instructions for TX troubleshooting .......................................................... 29
     Path of the transmitted signal .................................................................................. 29
     Fault-finding charts for transmitter ......................................................................... 29
     Power control loop .................................................................................................. 32
   Synthesizer fault-finding ...........................................................................................35
     19.44 MHz reference oscillator ............................................................................... 35
     RX VHF VCO......................................................................................................... 37
     TX VHF VCO ......................................................................................................... 38
     UHF Synthesizer ..................................................................................................... 38




Issue 2 07/2004                                2004 Nokia Corporation.                                                     Page 3
RH-21               Company Confidential
Troubleshooting                              Nokia Customer Care




Page 4             2004 Nokia Corporation.          Issue 2 07/2004
                                             Company Confidential                        RH-21
Nokia Customer Care                                                               Troubleshooting


Troubleshooting
         The first thing to do when a problem is encountered is to carry out a thorough visual
         check of the module. Make sure that:

            

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