Antenna Connector - Siemens M55 Repair Manual

5.1 Affected Units
5.1.1 Type:
5.1.2 Affected IMEIs / Date Codes:
5.1.3 Affected SW Versions:
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
Amplifier/
To Receiver
V 1.0
M55/M56

5 Antenna Connector

14
Page of 28
Company Confidential
Copyright 2003© Siemens AG
Information and Communication Mobile
M55/M56
All / All
All
To/From
Internal
Antenna
Mobile Phones
ICM MP CCQ GRM
05/03