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GSM TELEPHONE
SGH-F250
GSM TELEPHONE CONTENTS
1. Safety Precautions
2. Specification
3. Product Function
4. Array course control
5. Exploded View and Parts list
6. MAIN Electrical Parts List
7. Block Diagrams
8. PCB Diagrams
9. Flow Chart of Troubleshooting
10. Reference data
11. Disassembly and Assembly
Instructions
GSPN (Global Service Partner Network)
Country Web Site
North America service.samsungportal.com
Latin America latin.samsungportal.com
CIS cis.samsungportal.com
Europe europe.samsungportal.com
China china.samsungportal.com
Asia asia.samsungportal.com
Mideast & Africa mea.samsungportal.com
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. 2007. 12. Rev.1.0
1. Safety Precautions
1-1. Repair Precaution
Repair in Shield Box, during detailed tuning.
Take specially care of tuning or test,
because specificity 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
G S M9 00 DCS18 00
PCS1900
Ph ase 1 Ph ase 1
Fr eq.
880~915 1 710~17 85 1850~ 1910
Ba nd[MHz]
925~960 1 805~18 80 1930~ 1990
Up link/ Do wnl ink
ARFCN ran ge 0~124 & 975~1023 512~88 5 512~ 810
Tx/Rx spacin g 45MHz 95MHz 80MHz
Mod . Bit r ate/ 2 70.83 3kbps 2 70.83 3kbps 270. 833kbps
Bi t Peri od 3.692 us 3.692 us 3.6 92us
Tim e Slot 576.9 us 576.9 us 576. 9us
Per iod/ Fra me Per iod 4. 615ms 4. 615ms 4.615 ms
Mo dulat ion 0.3G M SK 0.3G MSK 0.3 GMSK
MS Power 3 3dBm~5 dBm 3 0dBm~0 dBm 30dBm~0dBm
Po wer Class 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Sen sitivity -1 02dBm -1 00dBm - 100dBm
TDMA M ux 8 8 8
Cell Radius 35Km 2Km -
2-1
Speclflcation
2-2. GSM Tx Power Class
TX Power TX Power TX Power
GSM850 DCS1800 PCS1800
control level control level control level
5 33