Nokia RM-555, Руководство по обслуживанию

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Auto tuning
Introduction to RF tunings
RF tuning is always performed with the help of a product-specific module jig, never with an RF coupler. Using
an RF coupler in the tuning phase will cause a complete mistuning of the RF part.
Cable and adapter losses
RF cables and adapters have some losses. They have to be taken into account when the phone is tuned. As
all RF losses are frequency dependent, the user has to act very carefully and understand the measurement
setup. For RF attenuations of the module jig and RF cable, please refer to the Service Tools section.
Auto tuning
This phone can be tuned automatically.
Auto tuning is designed to align the phone's RF part easier and faster. It performs calibrations, tunings and
measurements of RX and TX. The results are displayed and logged in a result file, if initiated.
Hardware set up
For hardware requirements for auto tuning, please refer to
Service concept for RF testing and RF/BB
tuning
.
Phoenix preparations
Install the phone specific data package, for example
RM-555_dp_1.78_sw_sh3.26.exe
. This defines phone
specific settings.
Auto tuning procedure
1 Make sure the phone (in the jig) is connected to the equipment. Otherwise some menus will not be shown
in Phoenix.
2 To go to autotune, select Tuning (Alt-U)
→
Auto-Tune (Alt-A) from the menu.
3 Start autotuning by clicking the
Tune
button.
Self Test Troubleshooting
Troubleshooting with RF Self tests
Context
Vapaus (N7500) RF ASIC contains test structures that can be used to detect certain RF related errors. In order
to use these self tests most efficient way, it is very important that the tests are performed in a certain order,
or at least that the error data is analyzed in this order. The tests are designed so that by going through them
in this order it is easy to find the problem component without any redundant checks. The flowchart presented
in this document is based on that idea. So, if RFBUS fails , there is no need to spend time wondering why
there is no power at TX, etc.
The testing order recommended and used in this troubleshooting guide is the following:
1 ST_CDSP_RF_BB_IF test (86)
•
Tests the functionality of the BB/Vapaus serial interface & Reset lines.
•
If this test fails, it means that there is a problem in programming of the N7500 and all of the following
tests can not give correct data.
2 ST_CDSP_RF_SUPPLY_TEST (83)
RM-555
RF Troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 4 –7
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