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Siemens A55 Repair Documentation
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ICM MP CCQ GRM
A55/C55_Hitachi
Company Confidential © Copy
right Siemens AG
04/03
10 Keyboard
The keyboard is connected via the lines KB0 – KB9 with the
EGOLD+
.
KB 7 is used for the ON/OFF switch. The lines KB0 – KB5 are used as output signals.
In the matrix KB6, KB8 and KB9 are used as input signals for the
EGOLD+
.
47
Table of Contents
Default Chapter
2
Table of Contents
2
1 List of Available Level 2,5E Parts A55/C55
4
2 Required Equipment for Level 2,5E
5
3 Required Software for Level 2,5E A55/C
5
4 Radio Part
6
Power Supply RF-Part
6
Frequency Generation
7
Synthesizer: the Discrete VCXO (26Mhz)
7
Synthesizer: LO1
9
Synthesizer: LO2
11
Synthesizer: PLL
12
Antenna Switch (Electrical/Mechanical Only C55)
13
Receiver
15
Receiver: EGSM900/1800 -Filter to Demodulator
15
IC Overview
17
Transmitter
18
Transmitter: Modulator and Up-Conversion Loop
18
Transmitter: Power Amplifier
19
5 Logic / Control
20
Overview of Hardware Structure
20
Logic Block Diagram
20
Block Diagram A55/C55 Control Part
20
Egold
21
Sram
25
Flash
25
Sim
25
Vibration Motor
26
6 Power Supply
26
Power Supply ASIC
26
Power Supply Diagram
27
Power Supply Operating Modes
28
Power Supply Functions
29
Battery
36
Charging Concept
36
7 Interfaces
40
Vibra
40
Earpiece
40
Microphone
41
Battery
41
IO Connector with ESD Protection
42
IO Connector - New Slim Lumberg
42
ESD Protection with EMI Filter
43
Sim
44
Display
44
8 Acoustic
45
Microphone
45
Mechanical
45
Electrical
45
Earpiece/Loudspeaker
46
Mechanical
46
Electrical
46
9 Display and Illumination
47
Display
47
Illumination
47
10 Keyboard
48
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Siemens A55 Specifications
General
Brand
Siemens
Model
A55
Category
Cell Phone
Language
English
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