Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung GSM Samsung SGH-X820 service manual

<< Back | Home

Most service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.

Image preview - the first page of the document

>> Download Samsung SGH-X820 service manual documenatation <<

Text preview - extract from the document

GSM TELEPHONE
SGH-X820

GSM TELEPHONE CONTENTS

1. Safety Precautions
2. Specification

3. Product Function

4. Array course control

5. Exploded View and Parts List

6. Disassembly and Assembly
instructions

7. MAIN Electrical Parts List

8. Block Diagrams

9. PCB Diagrams

10. Flow Chart of Troubleshooting

11. 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
3-1. Main Function ................................................................................3-1

4. Array course control
Software Downloading
4-1. Downloading Binary Files ................................................................4-2
4-2. Pre-requsite for Downloading ..........................................................4-2
4-3. S/W Downloader Program ...............................................................4-3

5. Exploded View and Parts List
5-1. Cellular phone Exploded View .........................................................5-1
5-2. Cellular phone Part list ...................................................................5-2

6. Disassembly and Assembly instructions
6-1. Disassembly ..................................................................................6-1
6-2. Assembly ......................................................................................6-3
6-3. LCD KIT Disassembly .....................................................................6-6
6-4. LCD KIT Assembly .........................................................................6-7

7. MAIN Electrical Parts List

8. Block Diagrams

9. PCB Diagrams
Contents

10. Flow Chart of Troubleshooting
10-1. Baseband
10-1-1. Power ON ..............................................................................10-1
10-1-2. Initial ....................................................................................10-4
10-1-3. Sim Part ...............................................................................10-6
10-1-4. Charging Part ........................................................................10-8
10-1-5. Microphone Part .....................................................................10-9
10-1-6. Speaker Part ........................................................................10-11
10-1-7. LCD ....................................................................................10-13
10-1-8. Camera ...............................................................................10-16
10-2. RF
10-2-1. GSM Receiver........................................................................10-18
10-2-2. DCS Receiver........................................................................10-19
10-2-3. PCS Receiver.........................................................................10-20
10-2-4. GSM Transmitter...................................................................10-23
10-2-5. DCS Transmitter....................................................................10-24
10-2-6. PCS Transmitter....................................................................10-25
10-2-7. Bluetooth Part ......................................................................10-27

11. 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

GSM900 E G S M 9 00 DCS1800
PC S1 90 0
Ph ase 1 Ph ase 2 Ph ase 1

Freq. Band[MHz] 890~915 880~915 1710~1785 1850~1910
Uplink/Downlink 935~960 925~960 1805~1880 1930~1990

0~124 &
ARFCN range 1~124 512~885 512~810
975~1023

Tx/Rx spacing 45 MHz 45 MHz 95 MHz 80 MHz

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

Time Slot
576.9 us 576.9 us 576.9 us 576.9 us
Period/Frame
4.615 ms 4.615 ms 4.615 ms 4.615 ms
Period

Modulation 0.3 GMSK 0.3 GMSK 0.3 GMSK 0.3 GMSK

MS Power 33 dBm~13 dBm 33 dBm~5 dBm 30 dBm~0 dBm 30 dBm~0 dBm

Power Class 5 pcl ~ 15 pcl 5 pcl ~ 19 pcl 0 pcl ~ 15 pcl 0 pcl ~ 15 pcl

Sensitivity -102 dBm -102 dBm -100 dBm -100 dBm

TDMA Mux 8 8 8 8

Cell Radius 35 Km 35 Km 2 Km -

2-1
Speclflcation

2-2. GSM Tx Power Class

TX Power TX Power TX Power
GSM900 DCS1800 PCS1900
control level control level control level

5 33

◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo