Samsung SGH-I740c User manual

GSM TELEPHONE
SGH-I740c
1. Safety Precautions
2. Specification
3. Product Function
4. Array course control
5. Exploded View and Parts list
6. MAIN Electrical Parts List
7. Disassembly and Assembly
Instructions
8. Block Diagrams
9. PCB Diagrams
10. Chart of Troubleshooting
11. Reference data
GSM TELEPHONE CONTENTS
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This Service Manual is aproperty of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
Samsung Electronics Co.,Ltd.
2008. 07.Re v.1.0
ⓒ
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
GSPN (Global Service Partner Network)

2. Specification
2-1
2-1. GSM General Specification
GSM850
Phase 1
EGSM 900
Phase 2
DCS1800
Phase 1 PCS1900
Freq.
Band[MHz]
Uplink/Downlink
824~849
869~894
880~915
925~960
1710~1785
1805~1880
1850~1910
1930~1990
ARFCN range 128~251 0~124 &
975~1023 512~885 512~810
Tx/Rx spacing 45MHz 45MHz 95MHz 80MHz
Mod. Bit rate/
Bit Period
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
Time Slot
Period/Frame
Period
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
Modulation 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~5dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
Power Class 5pcl ~ 19pcl 5pcl ~19
pcl 0pcl ~15 pcl 0pcl ~15 pcl
Sensitivity -102dBm -102dBm -100dBm -100dBm
TDMA Mux 8 8 8 8
Cell Radius 35Km 35Km 2Km 2Km

Specification
2-2
2-2. GSM Tx Power Class
TX Power
control
level
GSM850
533±2
dBm
631±2
dBm
729±2
dBm
827±2
dBm
925±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
TX Power
control
level
EGSM900
533±2
dBm
631±2
dBm
729±2
dBm
827±2
dBm
925±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
TX Power
control
level
DCS1800
030±3
dBm
128±3
dBm
226±3
dBm
324±3
dBm
422±3
dBm
520±3
dBm
618±3
dBm
716±3
dBm
814±3
dBm
912±4
dBm
10 10±4 dBm
11 8±4 dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
TX Power
control
level
PCS1900
030±3
dBm
128±3
dBm
226±3
dBm
324±3
dBm
422±3
dBm
520±3
dBm
618±3
dBm
716±3
dBm
814±3
dBm
912±4
dBm
10 10±4 dBm
11 8±4 dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm

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3. Product Function
3-1
This Document can not be used without Samsung's authorization
Main Function
-Slim Bar Design 2.5G MITS
-3.0Megapixel Camera
-2.8"QVGA 262K Color TFT Screen
-External Memory microSD (T-Flash)
-Video Recording &Messaging
-Music Player(MP3/AAC/AAC+)
-FM Radio Support
-A-GPS Support
-Bluetooth Wireless Technology V2.0+EDR
-Multimedia Message Service (MMS) /SMS /E-mail
-Voice recorder
-Speaker Phone
-Java MIDP 2.0/ WAP2.0
-GSM/GPRS Class 10
-Quad-band(850/900/1800/1900MHz)

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11. Reference data
11-1
This Document can not be used without Samsung's authorization
11-1. Reference Abbreviate
AAC:Advanced Audio Coding.
AVC :Advanced Video Coding.
BER :Bit Error Rate
BPSK:Binary Phase Shift Keying
CA :Conditional Access
CDM :Code Division Multiplexing
C/I :Carrier to Interference
DMB :Digital Multimedia Broadcasting
EN :European Standard
ES :Elementary Stream
ETSI:European Telecommunications Standards Institute
MPEG:Moving Picture Experts Group
PN :Pseudo-random Noise
PS :Pilot Symbol
QPSK:Quadrature Phase Shift Keying
RS :Reed-Solomon
SI :Service Information
TDM :Time Division Multiplexing
TS :Transport Stream

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1. Safety Precautions
1-1
This Document can not be used without Samsung's authorization
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 akind of magnetic object or tool, because performance of parts is damaged by
the influence of magnetic force.
―Surely use astandard screwdriver when you disassemble this product, otherwise screw will be
worn away.
―Use athicken twisted wire when you measure level. Athicken 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 arepair 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.

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Safety Precautions
1-2
This Document can not be used without Samsung's authorization
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 acircuit board.

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4. Array course control
4-1
This Document can not be used without Samsung's authorization
4-1. Software Adjustments
TEST JIG BOX (GH80-03308A)
RF TEST CAB (GH39-00985A)
TEST CAB (GH39-00993A/GH39-00990A)

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Array course control
4-2
This Document can not be used without Samsung's authorization
4-2. Software Downloading
4-2-1. Pre-requestsfor Downloading
•Downloader Program(QINGDAO DOWNLOADER V0.4.EXE)
•SGH-i740c Mobile Phone
•USB Data Cable of DLC JIG
•UART Data Cable(Serial Cabel) of DLC JIG
•Binary files(
PDA &Phone binary)
4-2-2. S/W Downloader Program
4-2-2-1. Phone S/W Downloading
■Load the binary download program by executing the
“QINGDAO DOWNLOADER V0.4.EXE”
1.Select the connected serial port and the rate of speed
2.Select the file what you want to download
3.Then, click the start button.
1