Samsung SGH-E300 Manual de usuario

GSM TELEPHONE

SGH-E300

GSM TELEPHONE CONTENTS

1. Specification

2. Flow Chart of Troubleshooting

3. Exploded Views and Parts List

4. Electrical Parts List

5. Block Diagrams

6. PCB Diagrams

SERVICE

Manual

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1. SGH-E300 Specification

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1-1

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

Time Slot

Period/Frame Period 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

1. GSM General Specification

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SGH-E310 Specification

1-2

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TX Power

control level GSM900

5 33±2dBm

6 31±2dBm

7 29±2dBm

8 27±2dBm

9 25±2dBm

10 23±2dBm

11 21±2dBm

12 19±2dBm

13 17±2dBm

14 15±2dBm

15 13±2dBm

16 11±3dBm

17 9±3dBm

18 7±3dBm

19 5±3dBm

TX Power

control level DCS1800

0 30±3dBm

1 28±3dBm

2 26±3dBm

3 24±3dBm

4 22±3dBm

5 20±3dBm

6 18±3dBm

7 16±3dBm

8 14±3dBm

9 12±4dBm

10 10±4dBm

11 8±4dBm

12 6±4dBm

13 4±4dBm

14 2±5dBm

15 0±5dBm

2. GSM TX power class

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2. SGH-E300 Flow Chart of Troubleshooting

2-1

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1.Baseband

1. Power ON

Check the current

consumption more

than 100mA

'Power On' does not work

Check the Voltage

more than 3.3V

Download again

Charge the Battery

Check the pin

11 of U102 is more

than 2.8V

Check U102 and C117

U102 pin 33,39

=2.8V Check U102 and C116

Check the clock

signal at pin4 of

OSC801

Freq=13MHz ?

Vrms≥300mV ?

Vpp is around

900mVpp ?

Check the clock generation

circuit

Check the initial operation

END

Yes

U102 pin 9

=1.8V

Yes

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2-2

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2. Initial

3. Sim Part

Check the signal at the

pin19ofU102is

"High" when the phone

is boot on

Initial Failure

Check U102

END

Yes

Check the pin 25 of

U100 is "High"

Yes

Check the U701

Check the pin 4 of

OSC801 is around 2.8V

Check the soldered status of

OSC801,R801,U102

Yes

Check LCD connector CN201,

and resolder bridge

Yes

Check the pin 1 of

CN100. voltage 3V ?

Phone can't access SIM card

Check the SIM

connector's (CN100)

connection to SIM

card

Check the circuit related to

U102

Resolder or change CN100

Check the circuit around CN100

input

circuitry

END

Yes

Check the related circuit of

CN100

Check the circuit around U601

output

and vlotage supply circuitry

Yes

Check the related circuit of

U601 and U102

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2-3

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4. Charging Part

Check the pin 17, 18

of CN300 is

TA_VEXT>4?

Abnormal charging part

Check the pin 2 of

Q102 is "low"?

Replace TA,Check CN300

Check the Q102

Check the Q100

END

Yes

Check the pin 3 of

Q100 is "low"?

Check the pin 5 of

Q102 is "3.2~4.2V"? Check the Q102

Yes

Check the ICHRG is

1V(during charging)

and around 180mV(full

charging)?

Resolder or change R102

Yes

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2-4

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( Picture 1)

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2-5

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(Picture 2)

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2-6

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(Picture 3)

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SGH-E300 Flow Chart of Troubleshooting and Circuit Diagrams

2-7

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5. Microphone Part

6. Speaker Part

check the soldered

status of microphone.

Microphone does not work

Check the reference

voltage on mic path

C431 ≒ 2.5 V

Resolder microphone

Resolder or change

R424,C431,R413,C410,R408,R411

END

Yes

Is microphone ok?

Check U701

Check the connection

from CN201 to LCD

module

Speaker does not work

Check the PIN 4 of

U401='High' and

U409='High'?

Check the circuit related to U401

Check U601

Is speaker ok?

Check U701

END

Yes

Is speaker ok?

Change Speaker

Yes

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