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GSM TELEPHONE
SGH-E420
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
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 Parts 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. Pown 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............................................................................................................9-12
9-7. Key Data Input........................................................................................................9-14
9-8. Receiver Part...........................................................................................................9-15
9-9. LCD Part..................................................................................................................9-16
9-10. Key Back Light......................................................................................................9-18
9-11. Camera Part...........................................................................................................9-19
9-12. GSM Receiver........................................................................................................9-21
9-13. GSM Transmitter....................................................................................................9-22
9-14. DCS Receiver........................................................................................................9-23
9-15. DCS Transmitter....................................................................................................9-24
9-16. PCS Receiver.........................................................................................................9-25
9-17. PCS Transmitter.....................................................................................................9-23
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 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.
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 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.
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 GS M 9 0 0 DCS1800
PCS1900
Phase 1 Phase 2 Phase 1
Fr eq.
890~915 880~915 1710~1785 1850~1910
Band[MHz]
935~960 925~960 1805~1880 1930~1990
Uplin k/Down link
0~124 &
ARF CN ra nge 1~124 512~885 512~810
975~1023
T x/Rx spacing 45MHz 45MHz 95MHz 80MHz
Mo d. Bit r ate/ 270.833kbps 270.833kbps 270.833kbps 270.833kbps
Bit Period 3.692us 3.692us 3.692us 3.692us
Ti me Slo t
576.9us 576.9us 576.9us 576.9us
Pe rio d/Fr am e
4.615ms 4.615ms 4.615ms 4.615ms
Per iod
Modula tion 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK
MS Power 33dBm~5dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
Powe r Class 5pcl ~ 19pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl
Se nsiti vity -102dBm -102dBm -100dBm -100dBm
TDMA Mu x 8 8 8 8
Cell Radiu s 35Km 35Km 2Km -
2-1
Speclflcation
2-2. GSM Tx Power Class
TX Power TX Power TX Power
GSM900 DCS1800 PCS1800
control level control level control level
5 33