Siemens M55 - Antenna Connector

Information and Communication Mobile
Mobile Phones
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ICM MP CCQ GRM
M55/M56
Company Confidential
Copyright 2003© Siemens AG
05/03
5 Antenna Connector
5.1 Affected Units
5.1.1 Type: M55/M56
5.1.2 Affected IMEIs / Date Codes:
All / All
5.1.3 Affected SW Versions:
All
5.2 Fault Description
5.2.1 Fault Symptoms for customers:
Network Search
No location update possible
5.2.2 Fault Symptoms on GSM Tester:
Output power problems on the external and internal antenna
No location update possible
5.2.3 Component Information:
The Antenna Connector is a mechanical switch operated by the RF plug of a car kit.
Normally the RF signal goes to and comes from the internal antenna. Whenever an RF plug
is plugged into the antenna connector the connection to the internal antenna is opened and
the connection to the external antenna socket is made. When the antenna connector is
blocked without RF plug the connection to the internal antenna is also opened. See drawing
below.
From Power
A
mplifier/
To Receiver
To/From
Internal
A
ntenna