Table Of Contents - Nokia RH-57 Series Troubleshooting Manual

2112 (RH-57)
Troubleshooting - RF
Contents
RF Troubleshooting......................................................................................................................................... 3
2112 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 ............................................................................................................................... 9
Cell Power Amplifier ............................................................................................................................. 13
Cell PMIC.................................................................................................................................................. 13
Cell IF/RF AGC and PA Control........................................................................................................... 15
Cell Power Detector .............................................................................................................................. 17
Tx System Block Diagram .................................................................................................................... 19
Receiver Troubleshooting ........................................................................................................................20
Rx IF........................................................................................................................................................... 20
Switching the Gain................................................................................................................................ 25
Rx RF.......................................................................................................................................................... 27
Rx AGC (Cell mode)............................................................................................................................... 29
Receiver Block Diagram ....................................................................................................................... 31
Synthesizer Troubleshooting ..................................................................................................................32
Synthesizer Setup .................................................................................................................................. 32
VCTCXO Tuning....................................................................................................................................... 33
VCTCXO Reference Clock ..................................................................................................................... 37
Synthesizer Block Diagram ................................................................................................................. 38
UHF Synthesizer ..................................................................................................................................... 39
Rx VHF....................................................................................................................................................... 40
Tx VHF ....................................................................................................................................................... 41
Tuning Descriptions ..................................................................................................................................43
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Issue 1 07/2004