Siemens Gigaset C45 Operator's manual

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C45, M50 AND MT50 CompanyConfidential © Copyright Siemens AG 05/02
C45 / M50 / MT50
Level 2.5e
Repair Documentation
V 1.0

V1.0 Page 2of 46 ICM MP CCQ ST
C45, M50 AND MT50 CompanyConfidential © Copyright Siemens AG 05/02
Table of Contents:
1LIST OF AVAILABLE LEVEL 2,5E PARTS C45, M50 + MT50.........4
2REQUIRED EQUIPMENT FOR LEVEL 2,5E......................................................5
3REQUIRED SOFTWARE FOR LEVEL 2,5E C45, M50 AND MT50....................5
4RADIO PART....................................................................................................6
4.1 Power SupplyRF-Part....................................................................................7
4.2 Frequencygeneration.....................................................................................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
5POWER SUPPLY..............................................................................................22
5.1 Overviewand Voltages.................................................................................22
5.2 Power SupplyASIC.......................................................................................23
5.3 Batteryand Charging....................................................................................26
5.3.1 Battery................................................................................................................................26
5.3.2 Charging Concept..............................................................................................................26
6LOGIC PART.....................................................................................................28
6.1 OverviewLogic/control...............................................................................28
6.2 EGOLD (PMB6850) V2.x...............................................................................30
6.3 EGAIM inside the EGOLD+...........................................................................31
6.3.1 Tasks ofthe EGAIM inside the EGOLD+...........................................................................32
6.4 Real Time Clock (integrated in the EGOLD+).............................................35
6.5 SRAM.............................................................................................................36

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6.6 FLASH............................................................................................................37
7ACOUSTICS......................................................................................................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
8ILLUMINATION:................................................................................................42
8.1 Illumination....................................................................................................42
9SIM-CARD AND CONNECTORS......................................................................43
9.1 SIM-Card........................................................................................................43
9.2 Displayconnector.........................................................................................44
9.3 I/O-Connector................................................................................................45
9.4 BatteryConnector.........................................................................................46

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C45, M50 AND MT50 CompanyConfidential © Copyright Siemens AG 05/02
1List of available level 2,5e parts
C45, M50 + MT50
ID-No Type Name, Location Part-No.
D100 IC Egold+ L36810-G6132-D670
D361 IC ASIC L36145-J4682-Y29
D800 IC Transceiver IC L36820-L6081-D670
D920 IC PA_Comperator L36820-L6084-D670
N386 IC
Volt.Regulator_ZUB
L36820-C6161-D670
N840 IC
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 IC Ant_Switch_Diplexer L36145-K280-Y181
Z890
VCO
Transmitter_VCO L36145-G100-Y92
Z900 IC Power_Amplifier L36851-Z2002-A45
Z950 Quartz Oszillator_26MHz L36145-F260-Y16

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2Required 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
- SpectrumAnalyser
- Active RF-Probe incl. Power Supply
- Oscilloscope incl. Probe
- RF-Connector (N<>SMA(f))
- Power SupplyCables
- Dongle (F30032-P28-A1)
- BGA Soldering equipment
Reference: Equipment recommendation V1.0 (downloadable fromthe technical support page)
3Required Software for Level 2,5e C45, M50
AND MT50
- Windows NTVersion4
- 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

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C45, M50 AND MT50 CompanyConfidential © Copyright Siemens AG 05/02
4Radio Part
The radio part ofthe C45, M50 AND MT50 consists ofa 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 supplyfor RF-Part
- Transmitter
- Receiver
- Synthesizer,
The RF-Part has it´s own power supplyrealised bya voltage regulator
which is directlyconnected to the battery. The voltages for the logic part are
generated bythe Power-SupplyASIC
The transmitter part converts the I/Q base band signals supplied bythe
logic (EGOLD+) into RF-signals with characteristics as defined in the
GSM recommendation (www.etsi.org) After amplification bya power
Amplifier the signal is radiated via the internal or external antenna.
The receiver part converts the received GMSK signal supplied bythe
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 26MHzoscillator is acting as a reference frequency.
Restrictions:
- The mobile phone can never transmit and receive in both bands simultaneously.
- Onlythe monitor time slot can be selected independentlyofthe frequencyband.
- Transmitter and receiver can ofcourse never operated simultaneously.

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4.1 Power SupplyRF-Part
A directlyto Batt+ connected voltage regulator, with a nominal output voltage
of2.8V is used, to performthe required “RF-Voltages” named VCC2_8 and
VCC_SYN.
The voltage regulator is activated as well as deactivated viaSLEEPQ and
VCXOEN provided bythe EGOLD+
The temporarydeactivation is used to extend the stand bytime.
Blockdiagram
PIN-OUT

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Circuit diagram
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

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4.2 Frequencygeneration
4.2.1 Synthesizer: The discrete VCXO (26MHz)
M46 mobile is using a reference frequencyof26MHzfor the Hitachi chip set.
The generation ofthe 26MHzsignal is done via a discrete “Colpitts” VCXO .
This oscillator consists mainlyof:
A 26MHzcrystal Z950
An oscillator switch V950
A capacitydiode V951
TP 951 after dividing bytwo
The oscillator output signal is directlyconnected to the BRIGHTIC (pin 38) to be
used as reference frequencyinside the Bright and to be divided by2.
This so gained signal SIN13MHZ_BB is used fromthe EGOLD+(functional M14).
To compensate frequencydrifts (e.g. caused bytemperature) the oscillator
frequencyis controlled bythe (AFC_PNM) signal, generated through the internal
EGOLD+ (D100 (functional R3)) PLL via the capacitydiode V951.
Reference is the base station frequency.
To compensate a temperature caused frequencydrift, 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 bythe N840 (VCC_SYN)through
R863 and R861
Waveform of the AFC_PNMsignal from EGOLD+ to Oscillator
EGOLD+
V1.3
GND GND
47K
R615
AFC
Signalform
C110
C616
100N
100N
AFC_PNM
GND
C600
10N
R600
V602
BAS170W
1
2
3
1 2 3
30K 22K
R106

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Circuit diagram
from EGOLD
EGOLDEGO
LD+
to Bright IC

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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 performthe channel selection in the TX part.
To do so, a control voltage for the LO1 is used. Gained bya comparator
(located inside the Transceiver -IC).
This control voltage is a result ofthe comparison ofthe divided LO1 and a reference
Signal. The division ratio ofthe dividers is programmed bythe EGOLD+, according
to the networkchannel requirements.
The first local oscillator (LO1) is part ofthe PLL which consists ofthe comparator
inside the Bright (D800), a loop filter and the VCO (Z850) module.
This LO1 circuit generates frequencies from:
3610-3760 MHzfor GSM900
3700-3840 MHzfor 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 bythe EGOLD+ signal PLLON (TDMA-Timer J12)
via V850 and therefore supplied with VCC_SYN. The VCO guarantees byusing the
control voltage at pin5 a coverage ofthe GSM900 and GSM1800 band.
The channel programming ofthe PLL happens via the EGOLD+ signalsSYGCCL,
SYGCDT, SYNSTR (RF Control K14, K15, M15).
The required voltage VCC_SYN is provided bythe N840

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Circuit diagram
4221
4222
13MHzto EGOLD
1
:
2
from EGOLD+
26MHz
Bright

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4.2.3 Synthesizer: LO2
The second local oscillator (LO2) consists ofa 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 onlyused for
transmit-operation. To avoid inband-spurious in the transmit-signal, the
LO2-frequencyassignment is not fixed for the whole band.
Before the LO2-signal gets to the modulator it is divided by8 for GSM900 and by4
for GSM1800. So the resulting
TX-IF frequencies are 45…46 MHz. GSM900
TX-IF frequencies are 90…92 MHz. GSM1800
2nd LO freq. = 360…368 MHzdivided by8 = 45…46 MHz,
divided by4 = 90…92 MHz
The LO2 PLL and power-up ofthe 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 bythe N840
Circuit diagram
Loop-filter LO2

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4.2.4 Synthesizer: PLL
PLL as a part ofthe BRIGHT IC
Blockdiagram

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4.3 Antenna switch (electrical/mechanical)
Internal/External <> GSM1900/PCS <> Receiver/Transmitter
The M46 mobile has two antenna switches.
a) The mechanical antenna switch for the differentiation
between the internal and external antenna
Internal
to / from
diplexer

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b) The electrical antenna switch, for the differentiation between the receiving
and transmitting signals.
To activate the correct settings ofthis diplexer, some logical switches and
switching signals are required. (V880, V881)
Bright

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4.4 Receivers
4.4.1 Receiver: GSM900/1800 –Filter to Demodulator
Fromthe antenna switch, up to the demodulator the received signal passes the
following blocks to get the demodulated baseband signals for the EGOLD+:
Filter >>>>>>>> LNA >>>>>>>> Demodulator>>>>>>>> PGC
Z880 Bright Bright Bright
Filter: The GSM900 and GSM 1800 filters are located inside the frontend module.
The Filter are centered to a frequencyof942,5MHzfor GSM900 and 1847,5MHz
for GSM1800. The symmetrical filter output is matched via LC-Combinations to
the LNA input ofthe BRIGHT(D800)
LNA: The LNA´s is located inside the BRIGHTand is able to performan
amplification/attenuation from~ 20dB. The LNA is can be switched in HIGH and
LOWmode and is controlled bythe Bright.
Demodulator: The Bright IC performs a direct demodulation ofthe received
GSM1900 Signals. To do so the LO1 is required.
The channel depending frequencies for 1900MHzband are divided by´2 for
internally.
PGC: After demodulation the “I” and “Q” signals are amplified bythe internal
PGC-Amplifier wherebythe “I” and the “Q” path are amplified independently
Fromeach other. The performance ofthis PGC is 80dB (-22 up to 58dB),
switchable in steps of2dB. The control is realised through the EGOLD+
signals (SYGCCL, SYGCDT, SYNSTR).
After passing an internal switch, the signals are readyfor further processing
through EGOLD+
The required voltage VCC_SYN is provided bythe N840

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from LO1
to EGOLD+
progr. signals

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4.4.2 IC Overview
IC Overview
BRIGHTIV

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4.5 Transmitter
4.5.1 Transmitter: Modulator and Up-conversion Loop
The modulation is also based on the principle ofthe
“up-conversion modulation phase locked loop” and is accomplished via the
BRIGHTIC(D800). The internal TX IF-LO provides the quadratic modulator with the
TX IF frequencies (79…81 MHz) bygenerating 632…648 MHzfrequencies,
which are divided by8.
This so generated IF GMSK RF signal is compared in a phase detector with the
down mixed GMSK RF output fromthe TX-VCO (Z890).
To get the comparison signal PCN_PA_IN signal appearing at Pin 10 ofthe (Z890)
is mixed with the LO1 signal (divided by2).
The output (PLLOUT) signal ofthe phase detector passes a discrete loop filter
realised bycapacitors and resistors to set the TXVCO to required frequency.
The large loop band width (~1,5MHz) guarantees that the regulating process is
considerablyquicker than the changes in the modulation signal.
The required voltage VCC_SYN and VCC2_8 is provided bythe N840
to PA
from EGOLD+
LO1