Samsung SGH-J750 User manual

UMTS TELEPHONE
SGH-J750
UMTS 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

This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
Samsung Electronics Co.,Ltd.
2007. 9. Rev.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)

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1. Safety Precautions
1-1
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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.

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Safety Precautions
1-2
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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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2. Specification
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2-1
2-1. GSM General Specification
GSM900
Phase 1 EGSM 900 Phase 2 DCS1800 Phase 1 PCS1900 WCDMA 2100
Freq.
Band[MHz]
Uplink/Downlink
890~915
935~960 880~915 925~960 1710~1785 1805~1880 1850~1910 1930~1990 1922 ~ 1977 2112 ~ 2167
ARFCN range 1~124 0~124 &
975~1023 512~885 512~810 UL : 9612 ~ 9888
DL : 10562 ~ 10838
Tx/Rx spacing 45MHz 45MHz 95MHz 80MHz 190MHz
Mod. Bit rate/
Bit Period 270.833kbps 3.692us 270.833kbps 3.692us 270.833kbps 3.692us 270.833kbps 3.692us 3.84Mcps
Time Slot
Period/Frame
Period
576.9us
4.615ms 576.9us 4.615ms 576.9us 4.615ms 576.9us 4.615ms Frame Length :10ms Slot length :0.667ms
Modulation 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK QPSK
HQPSK
MS Power 33dBm~13d
Bm 33dBm~5dB m30dBm~0dB m30dBm~0dB m24dBm ~ -50 dBm
Power Class 5pcl ~
15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl 3 (max + 24dBm)
Sensitivity -102dBm -102dBm -100dBm -100dBm -106.7 dBm
TDMA Mux 8 8 8 8
Cell Radius 35Km 35Km 2Km - 2Km

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Specification
2-2
2-2. GSM TX power class
TX Power
control level GSM900
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
TX Power
control level DCS1800
030±2dBm
128±3dBm
226±3dBm
324±3dBm
422±3dBm
520±3dBm
618±3dBm
716±3dBm
814±3dBm
912±4dBm
10 10±4 dBm
11 8±4dBm
12 6±4 dBm
13 4±4 dBm
14 2±5 dBm
15 0±5 dBm
TX Power
control level PCS1900
030±2dBm
128±3dBm
226±3dBm
324±3dBm
422±3dBm
520±3dBm
618±3dBm
716±3dBm
814±3dBm
912±4dBm
10 10±4 dBm
11 8±4dBm
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
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Main Function
―Mobile Instant Messaging
―Built-In Digital Camera with flash and Video Capture
―MP3 Player, and Java Games
―Hands-free speaker phone
―Bluetooth Wireless Technology
―Organizer feature provides Calendar, Alarms, Calculator, and Converter
―Multimedia Messaging Service-send and receive text messages with animation and sound
―Text Messaging Service-send and receive alphanumeric messages and Email
―Media Net Internet browsing
―Support 64 note polyphonic ringtones, MP3 ringtones, and AAC ringtones
―Tripple band(900/1800/1900MHz), WCDMA2100
―VGA Camera
―GPRS Class 10
―EGPRS Class E2

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Product Function
3-2
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4. Array course control
4-1
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4-1. Software Adjustments
1. JIG: Download, Trace, Calibration, etc [ 
2. RF test cable: RF test [ 
3. Test cable: JIG to phone [
4. TA (Travel Adaptor - S20pin ) [GH44-01702A]
5. Data Link Cable : USB cable (S20) [ GH39-00922A ]
6. Serial cable: PC to JIG
1

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Array course control
4-2
This Document can not be used without Samsung's authorization
4-2. Software Downloading
-2-1. Downloading Binary Files
• Five binary files for downloading J750
– : Modem binary for communication function
& Mocha binary for user interface and various application
– : Dependent Parameter Set
– J750XAGF3.rc1: Files need for each application, Power on/off & Back charging animation
– : Default file system to be put into in initial production
4-2-2. Pre-requsite for Downloading
• Downloader Program(J750 Downloader V8.exe)
• SGH-J750 Mobile Phone
• USB Data Link Cable
• Binary files