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GSM TELEPHONE
SGH-C400
GSM TELEPHONE CONTENTS
1. Safety Precautions
2. Specification
3. Product Function
4. Array course control
5. Exploded View/Disassembly
and Assembly Instructions
6. MAIN Electrical Parts List
7. Block Diagrams
8. PCB Diagrams
9. Flow Chart of Troubleshooting
10. Reference data
This Service Manual is a property of Samsung Electronics Co.,Ltd. Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law. 2006. 09 Rev.1.0
CONTENTS
1. Safety Precautions
1-1. Repair Precaution ...........................................................................1-1
1-2. ESD(Electrostatically Sensitive Devices) Precaution ...........................1-2
2. Specification
2-1. GSM General Specification ..............................................................2-1
2-2. GSM Tx Power Class ......................................................................2-2
3. Product Function
4. Array course control
4-1. Pre-requsite for Downloading...........................................................4-2
4-2. S/W Downloader Program................................................................4-2
5. Exploded View/Disassembly & Assembly Instructions
5-1. Cellular phone Exploded View.........................................................5-1
5-2. Cellular phone Parts list.................................................................5-2
5-3. Disassembly & Assembly Instructions..............................................5-4
6. MAIN Electrical Parts List
7. Block Diagrams
8. PCB Diagrams
CONTENTS
9. Flow Chart of Troubleshooting
9-1. Pown on.......................................................................................9-1
9-2. Initial............................................................................................9-5
9-3. SIM Part.......................................................................................9-7
9-4. Charging Part................................................................................9-9
9-5. Microphone Part...........................................................................9-12
9-6. Speaker Part...............................................................................9-14
9-7. Camera Part................................................................................9-16
9-8. RF
9-8-1. GSM900 Rx..............................................................................9-20
9-8-2. DCS Rx....................................................................................9-22
9-8-3. PCS Rx....................................................................................9-24
9-8-4. GSM900 Tx..............................................................................9-26
9-8-5. PCS/DCS Tx.............................................................................9-28
10. Reference data
1. Safety Precautions
1-1. Repair Precaution
Repair in Shield Box, during detailed tuning.
Take specially care of tuning or test,
because specipicty of cellular phone is sensitive for surrounding interference(RF noise).
Be careful to use a kind of magnetic object or tool,
because performance of parts is damaged by the influence of magnetic force.
Surely use a standard screwdriver when you disassemble this product,
otherwise screw will be worn away.
Use a thicken twisted wire when you measure level.
A thicken twisted wire has low resistance, therefore error of measurement is few.
Repair after separate Test Pack and Set because for short danger (for example an
overcurrent and furious flames of parts etc) when you repair board in condition of
connecting Test Pack and tuning on.
Take specially care of soldering, because Land of PCB is small and weak in heat.
Surely tune on/off while using AC power plug, because a repair of battery charger is
dangerous when tuning ON/OFF PBA and Connector after disassembling charger.
Don't use as you pleases after change other material than replacement registered on SEC System.
Otherwise engineer in charge isn't charged with problem that you don't keep this rules.
1-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Safety Precautions
1-2. ESD(Electrostatically Sensitive Devices) Precaution
Several semiconductor may be damaged easily by static electricity. Such parts are called by ESD
(Electrostatically Sensitive Devices), for example IC,BGA chip etc. Read Precaution below.
You can prevent from ESD damage by static electricity.
Remove static electricity remained your body before you touch semiconductor or parts with
semiconductor. There are ways that you touch an earthed place or wear static electricity
prevention string on wrist.
Use earthed soldering steel when you connect or disconnect ESD.
Use soldering removing tool to break static electricity. , otherwise ESD will be damaged by
static electricity.
Don't unpack until you set up ESD on product. Because most of ESD are packed by box and aluminum
plate to have conductive power,they are prevented from static electricity.
You must maintain electric contact between ESD and place due to be set up until ESD is connected
completely to the proper place or a circuit board.
1-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2. Specification
2-1. GSM General Specification
EGSM 900 DCS 1800 PCS 1900
P ha s e 2 P ha s e 1 P ha se 1
Fr eq. Band[MHz] 880~915 1710~1785 1850~1910
Uplink/ Downli nk 925~960 1805~1880 1930~1960
ARFCN r ange 975~1023 512~885 512~810
1~124
Tx/ Rx s paci ng 45MHz 95MHz 80MHz
Mod. Bit rate/ 270.833kbps 270.833kbps 270.833kbps
Bit Period 3.692us 3.692us 3.692us
Ti me Slot 576.9us 576.9us 576.9us
Peri od/Fr ame Per iod 4.615ms 4.615ms 4.615ms
Modulati on 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
Power Cl a ss 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Sensit ivit y -102dBm -100dBm -100dBm
TDMA Mux 8 8 8
Cell Radius 35Km 2Km 2Km
Operating
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