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RM-36
RF Troubleshooting and Manual Tuning Guide
Important:
After RF component changes, always use autotuning. Manual tunings are only required
in rare cases.
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
the RF losses are frequency dependent, the user have to be very careful and understand the measurement setup.
The following table presents the RF attenuations of the product-specific module jig:
Band
GSM900
GSM1800
GSM1900
WCDMA 2100
RF autotuning
RF autotuning with CMU200
Before you begin
Recommended test set-up:
• Windows 2000 PC
• CMU200 communication tester with options: B21V14, B54, K21, K22, K23 and B69.
• Minimum CMU200 firmware version is 3.50.
• USB to GPIB converter from National Instruments. Order information: 778416-01 GPIB-USB-B, NI-488.2 for
Windows 2000/XP/Me/98.
Before you can use the auto-tune feature, the GPIB driver from the GPIB card vendor must be installed and
running.
The autotuning feature does not work if all the necessary CMU options are not installed.
Then the auto tune .ini file must be in a correct place: C:\Program Files\Nokia\Phoenix\products\xx-x*
\autotune_xx-x*.ini (*= indicates the type designator of the phone, e.g. RM-1)
Context
It is possible to perform an automatic RF tuning with the aid of CMU200. Autotuning covers all RF tunings that
are needed to perform after RF component repairs.
Note:
Do not perform RF autotuning without a proper reason. Phones are tuned in production and an
RF tuning may be performed only after component repairs or if the RF tuning information is lost.
Steps
1.
Connect CMU200 to the GPIB bus.
2.
Start Phoenix service software.
Issue 1
Company Confidential
Copyright ©2005 Nokia. All Rights Reserved.
Attenuation
0.3 dB
0.4 dB
0.5 dB
0.8 dB
Nokia Customer Care
Page 7–17
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