Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung GSM Samsung SGH-X656 service manual

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GSM TELEPHONE
SGH-X656

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
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 GH68-12263A
International and/or domestic law. 2006. 08. Rev.1.0
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. Downloading Binary Files .............................................................4-4
4-2. Pre-requsite for Downloading .......................................................4-4
4-3. S/W Downloader Program ............................................................4-5

5. Exploded View/Disassembly and Assembly Instructions
5-1. Cellular phone Exploded View ......................................................5-1
5-2. Cellular phone Parts list ..............................................................5-2
5-3. Disassembly and Assembly Instructions.........................................5-4

6. MAIN Electrical Parts List

7. Block Diagrams

8. PCB Diagrams
CONTENTS

9. Flow Chart of Troubleshooting
9-1. Power ON ..................................................................................9-1
9-2. Initial ........................................................................................9-3
9-3. Charging Part ............................................................................9-6
9-4. SIM Part ...................................................................................9-8
9-5. Microphone Part .......................................................................9-10
9-6. Speaker Part(Melody).................................................................9-12
9-7. Key Data Input.........................................................................9-14
9-8. Receiver Part............................................................................9-15
9-9. LCD Part (for Color Main)...........................................................9-16
9-10. Key Back Light........................................................................9-18
9-11. Camera part............................................................................9-19
9-12. FM Radio part..........................................................................9-21
9-13. GSM Receiver..........................................................................9-22
9-14. GSM Transmitter......................................................................9-23
9-15. DCS Receiver..........................................................................9-24
9-16. DCS Transmitter......................................................................9-25
9-17. PCS Receiver...........................................................................9-26
9-18. PCS Transmitter.......................................................................9-27

10. Reference data
1. Safety Precautions

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.

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 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.

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
GSM850 DCS1800 PC1900
P ha se 1 Ph ase 1 Phas e 1

Fr eq. Band[MHz] 824~849 1710~1785 1850~1910
Uplink/ Downli nk 869~894 1805~1880 1930~1990

ARFCN r ange 128~251 512~885 512~810

Tx/ Rx s paci ng 45MHz 95MHz 80MHz

Mod. Bit rate/ 270.833kbps 270.833kbps 270.833kbps
Bit Period 3.692us 3.692us 3.692us

Ti me Slot 576.9us 576.9us 576.9us
Peri od/Fr ame Per iod 4.615ms 4.615ms 4.615ms

Modulati on 0.3GMSK 0.3GMSK 0.3GMSK

MS Power 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm

Power Cl a ss 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl

Sensit ivit y -102dBm -100dBm - 100dBm

TDMA Mux 8 8 8

Cell Radius 35Km 2Km 2Km

2-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Specification

2-2. GSM TX power class
TX Power TX Power TX Power
GSM850 DCS1800 PCS1900
control level control level control level

5 33

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