Samsung SGH-C240 User manual

GSM TELEPHONE
SGH-C240
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

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. Software Adjustments................................................................................................4-1
4-2. Software Downloading...............................................................................................4-2
5. Exploded View/Disassembly & Assembly Instructions
5-1. Cellular phone Exploded View..................................................................................5-1
5-2. Cellular phone Part 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. Baseband
9-1-1. Power On................................................................................................................9-1
9-1-2. Initial........................................................................................................................9-3
9-1-3. Sim Part..................................................................................................................9-5
9-1-4. Microphone Part......................................................................................................9-7
9-1-5. Speaker Part...........................................................................................................9-9
9-1-6. LCD Backlight.......................................................................................................9-11
9-2. RF
9-2-1. GSM RX................................................................................................................9-12
9-2-2. DCS RX................................................................................................................9-14
9-2-3. GSM TX................................................................................................................9-17
9-2-4. DCS Tx.................................................................................................................9-19
10. Reference data

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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 a kind of magnetic object or tool,
because performance of parts is damaged by the influence of manetic 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 disassembing 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 easilly 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.

2. Specification
2-1
2-1. GSM General Specification
GSM900
Phase 1 EGSM 900 Phase 2 DCS1800 Phase 1
Freq. Band[MHz]
Uplink/Downlink 890~915 935~960 880~915 925~960 1710~1785 1805~1880
ARFCN range 1~124 0~124 & 975~1023 512~885
Tx/Rx spacing 45MHz 45MHz 95MHz
Mod. Bit rate/
Bit Period 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
Modulation 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm
Power Class 5pcl ~ 15pcl 5pcl ~ 19pcl 0pcl ~ 15pcl
Sensitivity -102dBm -102dBm -100dBm
TDMA Mux 8 8 8
Cell Radius 35Km 35Km 2Km

Speclflcation
2-2
2-2. GSM Tx Power Class
TX Power
control level GSM900 TX Power control level DCS1800
5 33±2 dBm 0 30±3 dBm
6 31±2 dBm 1 28±3 dBm
7 29±2 dBm 2 26±3 dBm
8 27±2 dBm 3 24±3 dBm
9 25±2 dBm 4 22±3 dBm
10 23±2 dBm 5 20±3 dBm
11 21±2 dBm 6 18±3 dBm
12 19±2 dBm 7 16±3 dBm
13 17±2 dBm 8 14±3 dBm
14 15±2 dBm 9 12±4 dBm
15 13±2 dBm 10 10±4 dBm
16 11±3 dBm 11 8±4dBm
17 9±3dBm 12 6±4 dBm
18 7±3 dBm 13 4±4 dBm
19 5±3 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
-Name card
Create name cards with your number and profile. Whenever introducing yourself to
others, use this convenient electronic name card.
-Web browser
Access the wireless web to get current information and up-to-the-minute a wide
variety of media content.
-Multimedia Message Service (MMS)
Send and receive MMS messages with a combination of text, image, video, and
audio.
-E-mail
Send and receive-emails with image, video,and audio attachments.
-Java
Enjoy Java™-based embedded games and download new games.
-Calendar
Keep track of your daily, weekly, and monthly schedule.
-Voice recorder
Record memos or sounds.

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Product Function
3-2
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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 (GH80-00865A)
DATA CABLE
(GH39-00127A)
RF Test Cable
(GH39-00283A)