Samsung SGH-P400 User manual

SGH-P400
SERVICE
Manual
GSMTELEPHONECONTENTS
1.Specification
2.CircuitDescription
3.FlowChartofTroubleshooting
4.ExplodedViewsand PartsList
5.ElectricalPartsList
6.BlockDiagrams
7.PCB Diagrams
GSMTELEPHONE

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1. SGH-P400 Specification
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GSM900
Phase1EGSM900 Phase2DCS1800 Phase1PCS1900
Freq.Band[MHz]
Uplink/Downlink 890~915 935~960 880~915 925~960 1710~1785 1805~1880 1850~1910 1930~1990
ARFCNrange1~124 0~124 &
975~1023 512~885 512~810
Tx/Rxspacing 45MHz45MHz95MHz80MHz
Mod.Bit rate/
Bit Period 270.833kbps 3.692us270.833kbps 3.692us270.833kbps 3.692us270.833kbps 3.692us
TimeSlot
Period/FramePeriod 576.9us 4.615ms576.9us 4.615ms576.9us 4.615ms576.9us 4.615ms
Modulation 0.3GMSK0.3GMSK0.3GMSK0.3GMSK
MS Power33dBm~13dBm33dBm~5dBm30dBm~0dBm30dBm~0dBm
PowerClass 5pcl~15pcl5pcl~19pcl0pcl~15pcl0pcl~15pcl
Sensitivity-102dBm-102dBm-100dBm-100dBm
TDMAMux 8 8 8 8
Cell Radius35Km35Km2Km-
1. GSMGeneralSpecification

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SGH-P408 Specification
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TXPower
control levelGSM900
5 33±2 dBm
6 31±2 dBm
7 29±2 dBm
8 27±2 dBm
9 25±2 dBm
10 23±2 dBm
11 21±2 dBm
12 19±2 dBm
13 17±2 dBm
14 15±2 dBm
15 13±2 dBm
16 11±3 dBm
17 9±3dBm
18 7±3 dBm
19 5±3 dBm
TXPower
control levelDCS1800
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
TXPower
control levelPCS1900
0 30±3 dBm
1 28±3 dBm
2 26±3 dBm
3 24±3 dBm
4 22±3 dBm
5 20±3 dBm
6 18±3 dBm
7 16±3 dBm
8 14±3 dBm
9 12±4 dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
2. GSMTXpower class

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2. SGH-P400 Circuit Description
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1.SGH-P400 RFCircuitDescription
1)RXPART
1.ASM(U1005)
ð510SwitchingTx,RxpathforGSM900,DCS1800 andPCS1900 bylogic
controlling.
2.ASMControlLogic(U701,U702,U703)
ðTruthTable
VC1VC2VC3
GSMTxMode HL L
DCS/PCSTxMode LHL
PCSRxMode L L H
GSM/DCSRxMode L L L
3.FILTER
Toconvert ElectromagneticFieldWavetoAcousticWaveandthenpass the
specificfrequencyband.
-GSMFILTER (C1003,C1004,L1001)
ðForfilteringthefrequencyband between925 ~960 MHz
-DCSFILTER (C1005,C1006,L1002)
ðForfilteringthefrequencyband1805 and1880 MHz.
-PCS SAWFILTER (F1003,C1009,C1010,L1006)
ðForfilteringthefrequencyband between1930 and1990 MHz
4.TC-VCXO(OSC801)
To generatethe13MHzreferenceclocktodrivethelogic andRF.
Afteradditionalprocess,thereferenceclockisapplied totheU900 RxIQ
demodulatorandTxIQmodulator.
TheoscillatorforRXIQdemodulatorandTxmodulatorarecontrolled by
serialdatatoselectchannelandusefastlockmode forGPRShighclass
operation.

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SGH-P400 CircuitDescription
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5.Si4200 (U901)
Thischipintegratesthree differential-input LNAs.
TheGSMinputsupportstheE-GSM,DCSinputsupportstheDCS1800,PCS
inputsupportsthePCS1900.TheLNAinputsarematched tothe200 ohm
differentialoutputSAWfiltersthrougheternalLCmatchingnetwork.
Image-rejectmixerdownconvertstheRFsignaltoa100 KHzintermediate
frequency(IF)withtheRFLOfromSI4133Tfrequencysynthesizer.
TheRFLOfrequencyisbetween1737.8~1989.9MHz.
TheMixeroutputisamplified withananalog programmablegain
amplifier(PGA),whichiscontrolled byAGAIN.
ThequadratureIFsignalisdigitized with highresolutionA/Dconverts(ADC).
6.Si4201 (U900)
TheSI4201 down-convertsthe ADCoutput tobasebandwithadigital
100 KHzquadratureLOsignal.
DigitaldecimationandIIRfiltersperformchannelselectiontoremove blocking
andreferenceinterfacesignals.Afterchannelselection,the digitaloutputis
scaled withadigitalPGA,whichiscontrolled withtheDGAIN.DACsdrivea
differentialanalog signalontotheRXIP,RXIN,RXQP,RXQNpinstointerface
tostandardanalog-inputbasebandIC.
2)TXPART
BasebandIQsignalfed into offsetPLL,thisfunctionisincluded inside
ofU902 chip.
SI4200 chipgeneratesmodulatorsignalwhich powerlevelisabout1.5dBm
andfed intoPowerAmplifier(U1001).
ThePAoutputpowerandpower rampingarewell controlled byAuto
PowerControlcircuit.WeuseoffsetPLL below,
Modulation
Spectrum
200kHzoffset
30 kHzbandwidth
GSM-35dBc
DCS -35dBc
PCS -35dBc
400kHzoffset
30 kHzbandwidth
GSM-66dBc
DCS -65dBc
PCS -66dBc
600kHz~1.8MHzoffset
30 kHzbandwidth
GSM-75dBc
DCS -68dBc
PCS -75dBc