Siemens A50 Service Manual

C45 / M50 / MT50

Level 2.5e

Repair Documentation

V 1.0

V1.0 Page 1 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

V1.0 Page 2 of 46 ICM MP CCQ ST C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02

6.6 FLASH ............................................................................................................. 37

7 ACOUSTICS ....................................................................................................... 38

7.1 General ........................................................................................................... 38

7.2 Vibra ................................................................................................................ 39

7.3 Microphone and Loudspeaker (Ringer) ...................................................... 40

7.3.1 Loudspeaker ........................................................................................................................ 40

7.3.2 Microphone .......................................................................................................................... 40

7.3.3 Loudspeaker/Ringer ............................................................................................................ 41

8 ILLUMINATION: ................................................................................................. 42

8.1 Illumination .................................................................................................... 42

9 SIM-CARD AND CONNECTORS ....................................................................... 43

9.1 SIM-Card ................................................................................................ ......... 43

9.2 Display connector .......................................................................................... 44

9.3 I/O-Connector ................................................................................................. 45

9.4 Battery Connector ......................................................................................... 46

V1.0 Page 3 of 46 ICM MP CCQ ST C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02

ID-No

Type

Name, Location

Part-No.

D100

Egold+

L36810-G6132-D670

D361

ASIC

L36145-J4682-Y29

D800

Transceiver IC

L36820-L6081-D670

D920

PA_Comperator

L36820-L6084-D670

N386

Volt.Regulator_ZUB

L36820-C6161-D670

N840

Volt.Regulator_RF

L36810-C6065-D670

R959

Resistor

Temp_Resistor

L36120-F4223-H

L366

Diode

Diode_AF

L36840-D3084-D670

V342

Transistor

Tran._Charge

L36830-C1104-D670

V344

Diode

Diode_Charge

L36840-D5061-D670

V442

Transistor

Tran._SW_Vibra

L36830-C1097-D670

V850

Transistor

Tran._VCO_Switch

L36820-C6047-D670

V880

Transistor

Tran._Sw_Diplexer

L36820-C6047-D670

V881

Transistor

Tran._Sw_Diplexer

L36820-C6047-D670

V920

Diode

Feedback_Diode

L36840-D5049-D670

V922

Transistor

Tran._PA_Control

L36840-C4009-D670

V950

Transistor

Tran._26MHz_Ampl.

L36840-C4049-D670

V951

Diode

Capa_Diode

L36840-D61-D670

Z100

Quartz

Quarz/Egold

L36145-F102-Y8

Z850

VCO

1LO_VCO

L36145-G100-Y93

Z851

Filter

Filter_BALUN

L36145-K260-Y31

Z880

Ant_Switch_Diplexer

L36145-K280-Y181

Z890

VCO

Transmitter_VCO

L36145-G100-Y92

Z900

Power_Amplifier

L36851-Z2002-A45

Z950

Quartz

Oszillator_26MHz

L36145-F260-Y16

1 List of available level 2,5e parts

C45, M50 + MT50

V1.0 Page 4 of 46 ICM MP CCQ ST C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02

2 Required Equipment for Level 2,5e

- GSM-Tester (CMU200 or 4400S incl. Options)

- PC-incl. Monitor, Keyboard and Mouse

- Bootadapter 2000/2002 (L36880-N9241-A200)

- Troubleshooting Frame C45 (F30032-P135-A1)

- Power Supply

- Spectrum Analyser

- Active RF-Probe incl. Power Supply

- Oscilloscope incl. Probe

- RF-Connector (N<>SMA(f))

- Power Supply Cables

- Dongle (F30032-P28-A1)

- BGA Soldering equipment

Reference: Equipment recommendation V1.0 (downloadable from the technical support page)

3 Required Software for Level 2,5e C45, M50

AND MT50

- Windows NT Version4

- Winsui version1.22 or higher

- Windows software for GSM-Tester ( Cats(Acterna) or CMU-GO(Rohde&Schwarz) )

- Software for reference oscillator adjustment

- Internet unblocking solution

V1.0 Page 5 of 46 ICM MP CCQ ST C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02

4 Radio Part

The radio part of the C45, M50 AND MT50 consists of a Hitachi RF chip-set. The radio part is designed for Dual Band operation, covering EGSM900 as well

as GSM 1800 frequencies, and can be divided into 4 Blocks.

- Power supply for RF-Part

- Transmitter

- Receiver

- Synthesizer,

The RF-Part has it´s own power supply realised by a voltage regulator which is directly connected to the battery. The voltages for the logic part are generated by the Power-Supply ASIC

The transmitter part converts the I/Q base band signals supplied by the logic (EGOLD+) into RF-signals with characteristics as defined in the GSM recommendation (www.etsi.org) After amplification by a power Amplifier the signal is radiated via the internal or external antenna.

The receiver part converts the received GMSK signal supplied by the antenna into IQ base band signals which can then be further processed by the logic (EGOLD+).

The synthesizer generates the required frequencies for the transmitter and Receiver. A 26MHz oscillator is acting as a reference frequency.

Restrictions:

- The mobile phone can never transmit and receive in both bands simultaneously.

- Only the monitor time slot can be selected independently of the frequency band.

- Transmitter and receiver can of course never operated simultaneously.

V1.0 Page 6 of 46 ICM MP CCQ ST C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02

4.1 Power Supply RF-Part

A directly to Batt+ connected voltage regulator, with a nominal output voltage of 2.8V is used, to perform the required “RF-Voltages” named VCC2_8 and

VCC_SYN.

The voltage regulator is activated as well as deactivated via SLEEPQ and

VCXOEN provided by the EGOLD+

The temporary deactivation is used to extend the stand by time.

Blockdiagram

PIN-OUT

V1.0 Page 7 of 46 ICM MP CCQ ST C45, M50 AND MT50 Company Confidential © Copyright Siemens AG 05/02

Type

Part No.

Signal

Source

Output

Hitachi

N840

Pin 6 SleepQ

EGOLD+ L11

Pin 7 VCC2_8

Pin 2 VCXOEN

EGOLD+ P7

Pin 1 VCC_SYN

Circuit diagram

EGOLD+

V1.3

GND

47K

R615

AFC

Signalform

C110

C616

100N

AFC_PNM

GND

C600

10N

R600

V602

BAS170W

123

30K

22K

R106

4.2 Frequency generation

4.2.1 Synthesizer: The discrete VCXO (26MHz)

M46 mobile is using a reference frequency of 26MHz for the Hitachi chip set. The generation of the 26MHz signal is done via a discrete “Colpitts” VCXO . This oscillator consists mainly of:

A 26MHz crystal Z950 An oscillator switch V950 A capacity diode V951

TP 951 after dividing by two The oscillator output signal is directly connected to the BRIGHT IC (pin 38) to be

used as reference frequency inside the Bright and to be divided by 2. This so gained signal SIN13MHZ_BB is used from the EGOLD+(functional M14). To compensate frequency drifts (e.g. caused by temperature) the oscillator frequency is controlled by the (AFC_PNM) signal, generated through the internal EGOLD+ (D100 (functional R3)) PLL via the capacity diode V951. Reference is the base station frequency. To compensate a temperature caused frequency drift, the temperature-depending resistor R959 is placed near the VCXO to measure the temperature. The measurement result TVCXO is reported to the EGOLD+(baseband L4) via R136 as the signal TENV.

The required voltage VCC_OSC is provided by the N840 (VCC_SYN) through

R863 and R861

Waveform of the AFC_PNM signal from EGOLD+ to Oscillator

from EGOLD

to Bright IC

Circuit diagram

4.2.2 Synthesizer: LO1

The first local oscillator is needed to generate frequencies which enable the transceiver IC to mix an “IF” and to perform the channel selection in the TX part. To do so, a control voltage for the LO1 is used. Gained by a comparator (located inside the Transceiver -IC). This control voltage is a result of the comparison of the divided LO1 and a reference Signal. The division ratio of the dividers is programmed by the EGOLD+, according to the network channel requirements.

The first local oscillator (LO1) is part of the PLL which consists of the comparator inside the Bright (D800), a loop filter and the VCO (Z850) module. This LO1 circuit generates frequencies from:

3610-3760 MHz for GSM900 3700-3840 MHz for GSM1800 (The VCO can be switched via the signal VSW (Pin 3) to generate frequencies for GSM900 and GSM1800)

RX IF = no IF required TX IF-GSM900 = 45…46MHz TX IF-GSM1800 = 90…92MHz

Formula to calculate the frequencies: 1st LO freq. RX EGSM = Ch. * 4

PCN = Ch. * 2 The VCO (Z850) is switched on by the EGOLD+ signal PLLON (TDMA-Timer J12)

via V850 and therefore supplied with VCC_SYN. The VCO guarantees by using the control voltage at pin5 a coverage of the GSM900 and GSM1800 band. The channel programming of the PLL happens via the EGOLD+ signals SYGCCL,

SYGCDT, SYNSTR (RF Control K14, K15, M15).

The required voltage VCC_SYN is provided by the N840

4221

4222

13MHz to EGOLD

1 : 2

from EGOLD+

26MHz

Bright

Circuit diagram

Loop-filter LO2

4.2.3 Synthesizer: LO2

The second local oscillator (LO2) consists of a PLL and a VCO which are integrated in Bright IV and a second order loopfilter which is realized external. Due to the direct conversion receiver architecture, the LO2 is only used for transmit-operation. To avoid inband-spurious in the transmit-signal, the LO2-frequency assignment is not fixed for the whole band.

Before the LO2-signal gets to the modulator it is divided by 8 for GSM900 and by 4 for GSM1800. So the resulting

TX-IF frequencies are 45…46 MHz. GSM900 TX-IF frequencies are 90…92 MHz. GSM1800

LO freq. = 360…368 MHz divided by 8 = 45…46 MHz,

divided by 4 = 90…92 MHz

The LO2 PLL and power-up of the VCO is controlled via the tree-wire-bus of Bright IV+.(EGOLD+ signals SYGCCL, SYGCDT, SYNSTR (RF Control K14, K15, M15))

The required voltage VCC_SYN is provided by the N840

Circuit diagram

4.2.4 Synthesizer: PLL

PLL as a part of the BRIGHT IC Blockdiagram

+ 32 hidden pages

Siemens A50 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

2 Required Equipment for Level 2,5e

4 Radio Part

4.1 Power Supply RF-Part

4.2 Frequency generation

4.2.1 Synthesizer: The discrete VCXO (26MHz)

4.2.2 Synthesizer: LO1

4.2.3 Synthesizer: LO2

4.2.4 Synthesizer: PLL