Nokia n81 Service Manual

Also see for N81: User guide Specification sheet User guide User guide User guide

Contents

Nokia n81 Service Manual Manual pdf 140 page image

• one or more of the RF components have been replaced• flash memory chip is replaced or corrupted.RF calibration is always performed with the help of a product-specific module jig, never with an RF coupler.Using an RF coupler in the calibration phase will cause a complete mistuning of the RF part.Important: After RF component replacements, always use autotuning. Manual tunings are onlyrequired in rare cases.Cable and adapter lossesRF cables and adapters have some losses. They have to be taken into account when the phone is tuned. Asall RF losses are frequency dependent, the user has to act very carefully and understand the measurementsetup.For RF attenuations of the module jig, please refer to the Service tools section.Autotuning for BB5This phone can be tuned automatically.Autotune is designed to align the phone's RF part easier and faster. It performs calibrations, tunings andmeasurements of RX and TX. The results are displayed and logged in a result file, if initiated.Hardware set upHardware requirements for auto tuning:• PC (Windows 2000/XP) with GPIB card• Power supply• Product specific module jig• Cables: XRF-1 (RF cable), USB cable, GBIP cable and DAU-9S• Signal analyser (TX), signal generator (RX) and RF-splitteror one device including all.Figure 38 Auto tuning concept with CMU200Phoenix preparationsInstall the phone-specific data package. This defines the phone-specific settings.Auto tuning procedure1 Make sure the phone (in the jig) is connected to the equipment. Else, some menus will not be shown inPhoenix.RM-179; RM-223RF troubleshootingPage 4 –30 COMPANY CONFIDENTIAL Issue 1Copyright © 2007 Nokia. All rights reserved.