Инструкции По Обслуживанию для Nokia 3105
RH-48
Troubleshooting - RF
CCS Technical Documentation
Page 2
©
2003 Nokia Corporation Confidential
Issue 1 11/2003
Contents
Page No
RH-48 General Troubleshooting Notes ........................................................................3
Phone Components .......................................................................................................4
Phone Components .......................................................................................................4
Low Tx Power ............................................................................................................6
Cell Transmitter Setup ...............................................................................................7
Cell Transmitter Path ...............................................................................................10
Cell Transmitter Setup ...............................................................................................7
Cell Transmitter Path ...............................................................................................10
Cell Power Amplifier ...............................................................................................14
Cell PMIC ................................................................................................................15
Cell IF/RF AGC and PA Control .............................................................................17
Cell Power Detector .................................................................................................17
Tx System Block Diagram .......................................................................................19
Cell PMIC ................................................................................................................15
Cell IF/RF AGC and PA Control .............................................................................17
Cell Power Detector .................................................................................................17
Tx System Block Diagram .......................................................................................19
Rx IF.........................................................................................................................19
Switching the Gain ...................................................................................................24
Rx RF .......................................................................................................................26
Rx AGC (Cell mode)................................................................................................28
Receiver Block Diagram ..........................................................................................29
Switching the Gain ...................................................................................................24
Rx RF .......................................................................................................................26
Rx AGC (Cell mode)................................................................................................28
Receiver Block Diagram ..........................................................................................29
Synthesizer Setup .....................................................................................................30
VCTCXO Tuning .....................................................................................................31
VCTCXO Reference Clock......................................................................................35
UHF Synthesizer ......................................................................................................36
Rx VHF ....................................................................................................................38
Tx VHF ....................................................................................................................39
VCTCXO Tuning .....................................................................................................31
VCTCXO Reference Clock......................................................................................35
UHF Synthesizer ......................................................................................................36
Rx VHF ....................................................................................................................38
Tx VHF ....................................................................................................................39