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GSM TELEPHONE
SGH-E740S
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
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. 07 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 the
specification 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.
Background color for Navi-keys and 3*4 key pad of silver-coloured mold is 'silver'. Due to its
background color, white LED causes problems in daytime discrimination and brightness uniformity.
By applying Sky-blue LED, advantages both in discrimination and design can be satisfied.
Be careful to classify
SUB PBA: Print "BLUE LED" on the backside
3*4 KEY FPCB: Stamp "BLUE LED" on the frontside (see picture attached)
Colours of SGH-E740(Total of 8): Metal silver, Black dynamic, Light pink, Blue, Hot pink,
Blue green, Yellow green, Emerald green.
Among above eight, only Metal silver needs Sky-blue LED, while the rest stay with White LED
1-1
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Safety Precautions
BLUE LED
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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.
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Safety Precautions
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2. Specification
2-1. GSM General Specification
GSM 900 EGSM 900 DCS1800
PCS1900
Phase 1 Phase 2 Phase 1
Fr eq. Band [MHz] 890~9 15 880~9 15 1710~1 785 1 850~19 10
Up link/ Do wnl ink 935~9 60 925~9 60 1805~1 880 1 930~19 90
0~1 24 &
ARFCN ran ge 1~12 4 512~8 85 512~81 0
975~1 023
Tx/Rx spacin g 45MHz 45MHz 95MHz 80MHz
Mod . Bit r ate/ 270.8 33kbps 270.8 33kbps 270.8 33kbps 27 0.833 kbps
Bi t Peri od 3.69 2us 3.69 2us 3.69 2us 3.692 us
Tim e Slot 576. 9us 576. 9us 576. 9us 576.9 us
Per iod/ Fra me Per iod 4 .615ms 4 .615ms 4 .615ms 4. 615ms
Mo dulat ion 0.3G M SK 0.3G MSK 0.3G M SK 0.3G MSK
MS Power 33dBm~ 5dBm 33dBm~ 5dBm 30dBm~ 0dBm 30 dBm~0d Bm
4 4 1 1
Po wer Class
(max +33dBm) (max +33dBm) (max +30dBm) (max +30dBm)
Sen sitivity - 102dBm - 102dBm - 100dBm -1 00dBm
TDMA M ux 8 8 8 8
Cell Radius 35Km 35Km 2Km 2Km
2-1
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Specification
2-2. GSM TX power class
TX Power TX Power TX Power
GSM900 DCS1800 PCS1900
control level control level control level
5 33