3155/3155i (RM-41), 3152 (RM-61)
RF Description and Troubleshooting
Contents
Mobile Terminal Components ..................................................................................................................... 5
Main PWB ...................................................................................................................................................... 5
Tx Power Low ................................................................................................................................................ 8
Transmitter Block Diagram .....................................................................................................................10
Transmitter Schematics ...........................................................................................................................11
AMPS Tx Setup ....................................................................................................................................... 13
Cell Tx Setup ........................................................................................................................................... 16
PCS Setup................................................................................................................................................. 18
Failed Test: Tx PA Detector ................................................................................................................. 21
Tx Output Spectrum.............................................................................................................................. 22
Receiver RF Troubleshooting .................................................................................................................... 27
Receiver Block Diagram ...........................................................................................................................28
Receiver Schematics .................................................................................................................................29
RF AGC Status ............................................................................................................................................31
Turning on the Rx Path ............................................................................................................................32
Switching the Rx Gain States ................................................................................................................34
Checking AMPS from RF to IQ ........................................................................................................... 34
Receiver DC Test Points........................................................................................................................ 39
Receiver RF Test Points ........................................................................................................................ 40
Receiver IF Test Points.......................................................................................................................... 41
N7160 Receiver Overview .......................................................................................................................43
Synthesizer Troubleshooting .................................................................................................................... 45
Synthesizer Block Diagram .....................................................................................................................46
Synthesizer Schematics ...........................................................................................................................47
Incorrect PLL Frequencies.................................................................................................................... 48
VCTCXO Manual Tuning ....................................................................................................................... 50
AFC Voltage Troubleshooting .................................................................................................................51
UHF Synthesizer .........................................................................................................................................52
UHF Synthesizer Test Points ............................................................................................................... 53
Rx VHF LO (N7100) Schematic ..............................................................................................................54
Rx VHF LO Troubleshooting ....................................................................................................................55
Tx UHF LO (N7000) Schematic ..............................................................................................................56
GPS Troubleshooting................................................................................................................................... 58
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©2005 Nokia Corporation
Company Confidential
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ISSUE 1 07/2005