Siemens M50 Repair Documentation

V1.0 Page 2 of 46 ICM MP CCQ ST
C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02
Table of Contents:
1 LIST OF AVAILABLE LEVEL 2,5E PARTS C45, M50 + MT50.........4
2 REQUIRED EQUIPMENT FOR LEVEL 2,5E......................................................5
3 REQUIRED SOFTWARE FOR LEVEL 2,5E C45, M50 AND MT50....................5
4 RADIO PART....................................................................................................6
4.1 Power Supply RF-Part....................................................................................7
4.2 Frequency generation.....................................................................................9
4.2.1 Synthesizer: The discrete VCXO (26MHz)...........................................................................9
4.2.2 Synthesizer: LO1................................................................................................................11
4.2.3 Synthesizer: LO2................................................................................................................13
4.2.4 Synthesizer: PLL................................................................................................................14
4.3 Antenna switch (electrical/mechanical)......................................................15
4.4 Receivers.......................................................................................................17
4.4.1 Receiver: GSM900/1800 –Filter to Demodulator...............................................................17
4.4.2 IC Overview........................................................................................................................19
4.5 Transmitter....................................................................................................20
4.5.1 Transmitter: Modulator and Up-conversion Loop...............................................................20
4.5.2 Transmitter: Power Amplifier..............................................................................................21
5 POWER SUPPLY..............................................................................................22
5.1 Overview and Voltages.................................................................................22
5.2 Power Supply ASIC.......................................................................................23
5.3 Battery and Charging....................................................................................26
5.3.1 Battery................................................................................................................................26
5.3.2 Charging Concept..............................................................................................................26
6 LOGIC PART.....................................................................................................28
6.1 Overview Logic/control...............................................................................28
6.2 EGOLD (PMB6850) V2.x...............................................................................30
6.3 EGAIM inside the EGOLD+...........................................................................31
6.3.1 Tasks of the EGAIM inside the EGOLD+...........................................................................32
6.4 Real Time Clock (integrated in the EGOLD+).............................................35
6.5 SRAM.............................................................................................................36

Siemens M50 Specifications

General

Brand	Siemens
Model	M50
Category	Cell Phone
Language	English