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3
General Information
With the S25/S2588 is the first dual band, E-GSM and triple rate telephone of the
S-class of Siemens mobiles. The target consumer group of this class is the High-End
customer who requires an attractive telephone capable of high operating times and
equipped with an advanced set of features.
This telephone is a so called Dual band telephone, meaning it is capable of
operating in GSM 900 networks as well as in GSM 1800 ones.
The S2588 is a special version of S25, which is designed for the asian market. The
only difference between S25 and S2588 except the name is the different software
inside.
The software of S2588 supports presentation of
chinese characters on the display, the S25 software
does not.
The mobile offers professional features to the customer, of which some are available
for the very first time in a Siemens phone. Specific features are not available in every
model of S25. The decision is taken by the relevant customer (network operator,
service provider), and the phones he buys are programmed by Siemens in an
appropriate way. This has also an effect on the repair process. Please refer to the
chapter „Customer Specific Initialisations" in this manual.
4
Mechanical Concept
Note: All part numbers refer to mechanical drawing in section 4.1!
The mechanical concept of the S25 differs in various points from the one of the other Siemens
mobile telephones.
The first thing you will experience is how the housing is locked. The housing concept is
similar to the one of C25, meaning that in S25 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, the same opening tool as for C25 can be used. For details on
disassembly please refer to the relevant chapter in this manual.
In opposite to C25, in S25 the battery is part of the housing of the phone, so there no separate
battery cover is necessary.
Inside the housing the S25 consists of two separate boards, the MMI module (1010) and the
RF/Control module (1000). The boards are interconnected not by a plug or an interconnector
as known e.g. in S6 phones, but by a flexible cable (1030). This cable not soldered to the
boards, but plugged into two connectors. Therefore it can be exchanged easily in case of being
damaged.
Service Manual S25 / S2588
Sm_S25_lvl2_v11.doc
Information and Communication Products
V 1.0
Page 6 of 35
Mobile Phones
ICP CD ST
R. Fleuren
06/99
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