Mechanical Concept - Siemens A50 Service Manual

Mechanical Concept

A l w a y s r e f e r t o t h e S E R V I C E P A R T P R I C E L I S T
Note: All numbers refer to mechanical drawing in Figure 2.1.
The mechanical concept of the A50/1168 is similar in various points from other Siemens mobile
telephones.
The first thing you will experience is how the housing is locked. In A50/1168 no screws are used
to keep the housing closed. Also inside the telephone no screws are used anymore. To open the
housing, which is kept closed by catches only, a special opening tool has been defined. Once the
phone is open the catches will be damage and a new housing need to be used. For details on
disassembly tool please refer to Photo 2.5 in the Disassembly Section of this chapter.
Inside, the A50/1168 consists of just one board (1010), which carries control part and RF section
of the mobile.
The display module (1170) and the keypad module (1010) are connected to the board by the
flexible cable which is inserted into a plug-in connector. In case the display or keypad is defective
electrically or mechanically it can be exchanged very easily.
A50/1168 does have an external connector of a new type. Since S6 a so-called "Molex"-
connector was used, which also offered the possibility to connect an external antenna to it. The
new "Lumberg"-connector, which is used in A50/1168, does not feature such a connection,
because the connector for external antenna is located at the back side of the upper end of the
mobile, close to the internal antenna. As a consequence of this there is no need anymore for a
RF cable mounted to the board or for a RF plug on it to connect this cable. This improves RF-
properties of the mobile and lowers production costs.
To be able to do measurements on and software update of the telephone, an adapter cable
between Molex and Lumberg connector will be available. See photos in Additional Tools of
Chapter 3.
A50/1168 antenna is an integral part of the lower case shell (1030).
The keypad, the microphone and the loudspeaker are mounted into the upper case shell (1020).
Make sure that the microphone and the earphone contact springs are not dirty or damaged
during repair process.
Please take note that the number(s) used here IS NOT the part
number, DO NOT used it in your spare parts purchase order.
f o r y o u r s p a r e p a r t o r d e r .
The A50/1168 is a dual-band mobile operating on GSM900 and
GSM1800, the antenna is an integral part of the lower housing.
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