User Guide

RH-48
Troubleshooting - RF CCS Technical Documentation
Page 2 ©2003 Nokia Corporation Confidential Issue 1 11/2003
Contents
Page No
RF Troubleshooting ........................................................................................................3
RH-48 General Troubleshooting Notes........................................................................3
Phone Components.......................................................................................................4
Phone Cannot Make a Call.........................................................................................5
Transmitter Troubleshooting ........................................................................................6
Low Tx Power............................................................................................................6
Cell Transmitter Setup ...............................................................................................7
Cell Transmitter Path ...............................................................................................10
Tx AGC Tuning.....................................................................................................13
Cell Power Amplifier ...............................................................................................14
Cell PMIC ................................................................................................................15
Cell IF/RF AGC and PA Control.............................................................................17
Cell Power Detector .................................................................................................17
Tx System Block Diagram .......................................................................................19
Receiver Troubleshooting...........................................................................................19
Rx IF.........................................................................................................................19
Switching the Gain...................................................................................................24
Rx RF .......................................................................................................................26
Rx AGC (Cell mode)................................................................................................28
Receiver Block Diagram..........................................................................................29
Synthesizer Troubleshooting ......................................................................................29
Synthesizer Setup.....................................................................................................30
VCTCXO Tuning.....................................................................................................31
VCTCXO Reference Clock......................................................................................35
UHF Synthesizer ......................................................................................................36
Rx VHF ....................................................................................................................38
Tx VHF ....................................................................................................................39
Tuning Descriptions....................................................................................................41