Samsung SGH-E420 Service Manual

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.

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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.

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2. Specification

2-1. GSM General Specification

		GSM900	EGSM 900	DCS1800	PCS1900
		Phase 1	Phase 2	Phase 1
	Freq.	890~915	880~915	1710~1785	1850~1910
	Band[MHz]
		935~960	925~960	1805~1880	1930~1990
	Uplink/Downlink
	ARFCN range	1~124	0~124 &	512~885	512~810
			975~1023
	Tx/Rx spacing	45MHz	45MHz	95MHz	80MHz
	Mod. Bit rate/	270.833kbps	270.833kbps	270.833kbps	270.833kbps
	Bit Period	3.692us	3.692us	3.692us	3.692us
	Time Slot	576.9us	576.9us	576.9us	576.9us
	Period/Frame
		4.615ms	4.615ms	4.615ms	4.615ms
	Period
	Modulation	0.3GMSK	0.3GMSK	0.3GMSK	0.3GMSK
	MS Power	33dBm~5dBm	33dBm~5dBm	30dBm~0dBm	30dBm~0dBm
	Power Class	5pcl ~ 19pcl	5pcl ~ 19pcl	0pcl ~ 15pcl	0pcl ~ 15pcl
	Sensitivity	-102dBm	-102dBm	-100dBm	-100dBm
	TDMA Mux	8	8	8	8
	Cell Radius	35Km	35Km	2Km	-

2-1

Speclflcation

2-2. GSM Tx Power Class

TX Power	GSM900		TX Power	DCS1800		TX Power	PCS1800
control level			control level			control level
5	33±2 dBm		0	30±3 dBm		0	30±3 dBm
6	31±2 dBm		1	28±3 dBm		1	28±3 dBm
7	29±2 dBm		2	26±3 dBm		2	26±3 dBm
8	27±2 dBm		3	24±3 dBm		3	24±3 dBm
9	25±2 dBm		4	22±3 dBm		4	22±3 dBm
10	23±2 dBm		5	20±3 dBm		5	20±3 dBm
11	21±2 dBm		6	18±3 dBm		6	18±3 dBm
12	19±2 dBm		7	16±3 dBm		7	16±3 dBm
13	17±2 dBm		8	14±3 dBm		8	14±3 dBm
14	15±2 dBm
			9	12±4 dBm		9	12±4 dBm
15	13±2 dBm		10	10±4 dBm		10	10±4 dBm
16	11±3 dBm		11	8±4dBm		11	8±4dBm
17	9±3dBm		12	6±4 dBm		12	6±4 dBm
18	7±3 dBm		13	4±4 dBm		13	4±4 dBm
19	5±3 dBm		14	2±5 dBm		14	2±5 dBm
			15	0±5 dBm		15	0±5 dBm

2-2

3. Product Function

Main Function

-VGA Camera

-65536 Color OLED Main Screen (128×160) 65536 Color OLED Sub Screen (96×96) -SMS/EMS/MMS Message Service

-WAP Http support

-J2ME JAVA (MIDP 2.0/CLDC 1.1) -Speaker phone

-40 Poly Melody -vCard, vCalendar -E-mail Client

-Tri-band(900/1800/1900MHz)

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Product Function

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4. Array course control

4-1. Software Adjustments

Test Jig (GH80-01909A)

Test Cable(SGH-E420VER2)

Serial Cable(CSA LL64151-A)

Power Supply Cable

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Array course control

4-2. Software Downloading

4-2-1. Pre-requsite for Downloading

•Downloader Program(Lily Downloader 2.0.exe)

•E420 Mobile Phone

•Data Cable

•Binary file, TFS file

4-2-2. S/W Downloader Program

■ Load the binary download program by executing the

“Lily Downloader 2.0.exe”

1. Select the connected serial port and the rate of speed

2. Select the check box, the mode you want to download. - if the binary file wanted, check only 'BIN'

- if the tfs file wanted, check only 'TFS' - if all the files wanted, check 'BIN+TFS'

1 2

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Array course control

3. Select the file(s) what you want to download

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Array course control

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5. Exploded View/Disassembly&Assembly Instructions

5-1. Cellular phone Exploded View

	QRF03
	QFR01
QFU01
QME15	QKP01

		QME01
QLB01		QCA02
	QMP01
	QVK01	QMI01
QCA01	QAN05	QCR12
		QAN02

QLC01	QMO01
	QSP01		QCK01
			QMI03
	QHI01		QRE01
QFL01		QVO01
		QRF01	QCR05
QCR26			QBA01
QSC01
			QBA00
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Exploded View/Disassembly&Assembly Instructions

5-2. Cellular phone Parts list

Design LOC		Description	Sec Code
QAN02		INTENNA-SGHE420	GH42-01018A
QAN05		ASSY MEC-INTENNA CONTACT	GH75-08168A
QBA00		PMO-COVER BATTERY	GH72-33285A
QBA01		INNER BATTERY PACK-750MAH,BLK,	GH43-02483A
QCA01		UNIT-CAMERA MODULE	GH59-03566A
QCA02		UNIT-CAMERA KEY	GH59-03606A
QCK01		PMO-CAMERA KEY	GH72-33287A
QCR05		SCREW-MACHINE	6001-001478
QCR12		SCREW-MACHINE	6001-001530
QCR26		SCREW-MACHINE	6001-001850
QFU01		ASSY CASE-FOLDER UPPER	GH98-01842A
QKP01		ASSY KEYPAD-(SER/UWA)	GH98-02645A
QLB01		ASSY BRACKET-LCD	GH98-01846A
QME01		UNIT-METAL DOME	GH59-03605A
QME15		ELA ETC-EL SHEET(PNK)	GH96-02356A
QMI01		MICROPHONE-ASSY-SGHE420	GH30-00311A
QMO01		MOTOR DC-SGHE420	GH31-00198C
QMP01		PBA MAIN-SGHE420	GH92-03133A
QRF01		RMO-COVER RF	GH73-08169A
QSC01		RMO-COVER SCREW	GH73-08170A
QSP01		SPEAKER	3001-002064
QVK01		UNIT-VOLUME KEY	GH59-03595A
QVO01		PMO-VOLUME KEY	GH72-33286A
QFR01		ASSY CASE-FRONT	GH98-01844A
	QRF03	PMO-COVER EAR	GH72-33281A
QFL01		ASSY CASE-FOLDER LOWER	GH98-01843A
	QHI01	ASSY MEC-HINGE(CAN TYPE)	GH75-04662A
QLC01		LCD-M/S SGH-E420	GH07-01014A
	QMW01	AS-LCD WINDOW SVC	GH81-06126A
QRE01		ASSY CASE-REAR	GH98-01845A
	QMI03	RMO-RUBBER MIC	GH73-08187A

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Exploded View/Disassembly&Assembly Instructions

Description	Sec Code
BAG PE	6902-000634
ADAPTOR-SGHE690,SIL,EU,A_TYPE	GH44-01361B
LABEL(P)-WATER SOAK	GH68-02026A
LABEL(P)-WATER SOAK	GH68-02026A
MANUAL-SFC	GH68-04336A
LABEL(P)-BARCODE RUSSIA	GH68-08494A
MANUAL USERS-EU RUSSIAN	GH68-12319A
LABEL(R)-MAIN(SER)	GH68-12806A
BOX-UNIT(SER)	GH69-04579A
CUSHION-CASE(EU)	GH69-04581A
MPR-INSU TAPE	GH74-18047A
MPR-TAPE MIC	GH74-25834A
MPR-GASKET LCD CONN	GH74-25836A
MPR-VINYL BOHO F/LOWER	GH74-26366A
MPR-VINYL BOHO F/UPPER 2DN	GH74-26368A
MPR-TAPE,9.1X3.1XT0.06,3M1361	GH74-26419A
MPR-INSULATION TAPE,11.2X7.5XT	GH74-26425A
MPR-INSU TAPE EL CONN	GH74-27032A
MPR-TAPE MAIN LCD	GH74-27500A
MPR-SPONGE LCD	GH74-27688A
MPR-INSU TAPE	GH74-28027A
MPR-VINYL BOHO MAIN	GH74-29305A
MPR-VINYL BOHO REAR BATT	GH74-29981A
AS-MAIN LCD SVC	GH81-05969A
AS-SUB LCD SVC	GH81-05970A
AS-LCD PCB SVC	GH81-05971A
AS-WINDOW TAPE SVC	GH81-06097A

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Exploded View/Disassembly&Assembly Instructions

5-3. Disassembly and Assembly Instructions

― Disassembly

	1			1) Unscrew the REAR at the four points.
							2			1) Break both side hooks in rear and
										disassemble the rear from front like the
										figure.

1) Be careful not to make scratch and molding damage! 1) Be careful not to make scratch and molding damage!

	3			1)	Disassemble the LCD CONNECTOR			4
				2)Disassemble the VOL KEY and CAMERA KEY
				FPCB from the FRONT ASS'Y using a				1) remove the dust prevention tape.
				pincette.				2) Push in the Hinge using the stick
								and disassemble the Front.
				3)	Disassemble the PBA from the FRONT ASS'Y.
				4)	Disassemble the Keypad.

1) When LCD CONNECTOR FPCB and VOLUME KEY FPCB are

1)

Be careful not to make scratch and molding damage!

2)

Be careful not to be torn the dust prevention tape.

separated from the front , Be careful not to damage!

3)

Be careful not to damage LCD FPCB!

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Exploded View/Disassembly&Assembly Instructions

1) Be

separated

Folder

upper from folder

5

1)

Remove screw caps.

6

2)

Unscrew the FOLDER

Upper.

lower

using the

stick.

SCREW CAP POINTS

1)Be careful not to make scratch and molding damage! 1) Be careful not to make scratch and molding damage!

2)Be careful not to damage LCD FPCB!

	7		1) Remove the cusion tape on the camera		8		1) Disassemble the EL sheet FPCB	and camera
			connector and some parts using a				FPCB fron the connector using	a pincette.

pincette.

2)Remove the insulation tapes on the camera connector and EL sheet connector.

1) Be careful not to damage camera FPCB and EL sheet FPCB.

1) Be careful not to damage camera FPCB and EL sheet FPCB.

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Exploded View/Disassembly&Assembly Instructions

	9
				1)	Disassemble the speaker pushing a		10			1) Disassemble LCD module from Folder lower
				pincette in a groove.
				2)	Disassemble the motor in the same way

					1) Be careful when you disassemble because the LCD
1)		Be careful not to damage the speaker and a motor			module1) was fixedLCDby the tape.
1)		LCD CONNECTOR .
wire.					2) Be careful. not to damage the LCD FPCB when
					disassemble
		11		1) Disassemble the UPPER and the LCD braket

1)Be careful not to make scratch and molding damage!

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Exploded View/Disassembly&Assembly Instructions

― Assembly

		1			1)	Insert the Camera FPCB to CONNECTOR			2			1)	Insert the Moter into Lower
					2)	Insert the camera into FOLDER LOWER						2)	Twist the Speker Wire three times
					before LCD moudle inserting.
												3) Insert the Speker into Lower
					3) I n s e r t t h e L C D C O N N E C T O R
					F P C B t o H I N G E

1) When inserting the FPCB and when in order, be

careful not to damage not the FPCB.

1)When inserting the motor and the speaker, it pays

2) When inserting the camera module, be careful not

attention in WIRE control.

to damage not the FPCB.

1) To a base line, attach the insulation

4

1) Using the pincette, insert The EL SHEET FPCB

TAPE and cushion TAPE on camera

in the CONNECTOR.

3

CONNECTOR top.

2) Attach the fixation insulation TAPE above the

2) Attach the EL Sheet damage prevention

connector.

cushion TAPE like the figure.

									1)	When inserting the FPCB, be careful not to damage
1) When attaching the TAPE, be careful not to									the FPCB.
damage camera FPCB at pincette.									2)	When attaching an insulation TAPE, be careful
									not to cover the LCD.

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Exploded View/Disassembly&Assembly Instructions

5	1) Assemble the UPPER and LOWER		6	1)	Screw up the two	points
				2)	Insert the SCREW	CAP
		1
	3	3
		2

1) Be careful not to make scratch and molding damage! 1) Use 1.2 ± 0.2 Kgf.cm!

1)

When assembling the Folder

Assy and the

1)

Insert the KEYPAD.

7

8

Front, pass the LCD CONNECTOR

in first and

assemble the HINGE.

2)

Attach the dust prevention

TAPE like the

photograph.

1)Be careful not to damage the LCD CONNECTOR FPCB .

2)When attaching the dust prevention TAPE, be careful not to cover the keypad groove.

1) Be careful not to insert keypad into FRONT incorrectly!

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