Siemens C55 Repair Documentation

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A55/C55_Hitachi Company Confidential © Copyright Siemens AG 04/03
Table of Contents:
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/C55........................................ 5
4 RADIO PART ...................................................................................................... 6
4.1 Power Supply RF-Part .................................................................................... 6
4.2 Frequency generation ....................................................................................7
4.2.1 Synthesizer: The discrete VCXO (26MHz)...........................................................................7
4.2.2 Synthesizer: LO1..................................................................................................................9
4.2.3 Synthesizer: LO2................................................................................................................11
4.2.4 Synthesizer: PLL ................................................................................................................12
4.3 Antenna switch (electrical/mechanical only C55)...................................... 13
4.4 Receiver......................................................................................................... 15
4.4.1 Receiver: EGSM900/1800 –Filter to Demodulator.............................................................15
4.4.2 IC Overview ........................................................................................................................17
4.5 Transmitter.................................................................................................... 18
4.5.1 Transmitter: Modulator and Up-conversion Loop...............................................................18
4.5.2 Transmitter: Power Amplifier ..............................................................................................19
5 LOGIC / CONTROL........................................................................................... 20
5.1 Overview of Hardware Structure ................................................................. 20
5.1.1 Logic Block Diagram ..........................................................................................................20
5.1.2 Block Diagram A55/C55 Control Part.................................................................................20
5.1.3 EGOLD+.............................................................................................................................21
5.1.4 SRAM .................................................................................................................................25
5.1.5 FLASH ................................................................................................................................25
5.1.6 SIM .....................................................................................................................................25
5.1.7 Vibration Motor ...................................................................................................................26
6 POWER SUPPLY.............................................................................................. 26
6.1 Power Supply ASIC ...................................................................................... 26
6.1.1 Power Supply Diagram.......................................................................................................27
6.1.2 Power Supply Operating modes: .......................................................................................28
6.1.3 Power Supply Functions:....................................................................................................29
6.2 Battery ........................................................................................................... 36
6.3 Charging Concept......................................................................................... 36
7 INTERFACES.................................................................................................... 40

Siemens C55 Specifications

General

Brand	Siemens
Model	C55
Category	Cell Phone
Language	English