NHL-10
RF Troubleshooting CCS Technical Documentation
ISSUE 2 01/2004 COMPANY CONFIDENTIAL 5
Copyright © 2003 Nokia. All Rights Reserved.
Introduction
This document describes the troubleshooting and RF tuning of Nokia 6600 (NHL-10). In gen-
eral, two types of measurements have to be performed during the troubleshooting and repair
of phones:
• RF measurements shall be done with a spectrum analyzer, either connected directly
to the RF connector of the board (“antenna point”), or used together with a high-fre-
quency probe to measure RF signals at points along the TX or RX chain.
• LF (Low-Frequency) and DC measurements shall be done either with a multimeter, or
with an oscilloscope together with a 10:1 probe.
All tuning must be done with Phoenix Service Software, version A9 2003.15.2.25, or later.
Always make sure that the measurement set-up has been calibrated when measuring RF pa-
rameters at the RF connector. Remember to include the correct losses in the module repair jig
and the connecting cable when realigning the phone.
Most RF semiconductors are static discharge sensitive. ESD protection must be taken into
account during repair (ground straps and ESD soldering irons).
Mjølner RF ASIC is moisture sensitive. Therefore, Mjølner RF ASIC must be pre-baked prior
to soldering.
RF calibration done via Phoenix software is temperature sensitive because of calibra-
tion of 26MHz reference oscillator (VCXO). According to the Mjølner specification, ambient
temperature has to be in the range of 22 to 36
o
C.
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