Mechanical Concept - Siemens S45 Service Manual

Figure 2.1 ME45 EXPLODED DIAGRAM
Please take note that the number(s) used here IS NOT the part

number, DO NOT used it in your spare parts purchase order.
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
f o r s p a r e p a r t s o r d e r i n g .

Mechanical Concept

Note: All part numbers are referred to mechanical drawing in Figure 2.2 for S45 &
2.3.for ME45
The mechanical concept of the S35/ME45 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 No screws are used to keep
the housing closed even internal of the phone To open the housing, which is kept closed by
catches only, a special opening tool has been defined. For details on disassembly tool
please refer to Photo 2. in this chapter.
Inside, the S45/ME45 consists of 2 PCB boards; on of which is the RF board and the other
is the interface with the Keypad.
Keyboard
The Keyboard will be realised via a separate PCB which will be connected to the main PCB
via board-to-board connector with 12 interconnections. The illumination of the keypads will
be done via high-brightness LEDs (colour: amber 590 nm, driven by 5 mA / LED).
Target for the number of LEDs is 4. If it is not possible to get a homogenious illumination of
the keypad, the LED count must be increased to 6. The LEDs for keypad and display are
supplied from a 2.9V linear regulator (REG1) inside the ASIC. Unlike in P35 there is no
pulse-width-modulation necessary to maintain a constant brightness over battery voltage.
Display Modules
Overview of HW Structure
Due to the LCD-controller shortage in the market, four different LCD-controllers can be
connected to the K45-PCB. Three (Hitachi, Samsung, Rohm) do have nearly a similar
interface to the power supply, the EGOLD+ and the passive components. Thus, all display
modules from various module suppliers can be connected to a single interface by using the
mentioned controllers. The interface is realised by a ZIF connector with 28 interconnections.
Unfortunately, the fourth display controller (Epson type) has a completely different interface
pinning as compared to the three others. Therefore, a separate PCB with a 26-pin ZIF-
connector is essential. The different displays can be identified by hardware coding on the
FPC in combination with resistors on PCB.