Samsung SGH-P738 Manual de usuario

GSM TELEPHONE

SGH-P738

GSM TELEPHONE CONTENTS

1. Specification

2. Flow Chart of Troubleshooting

3. Exploded Views and Parts List

4. Electrical Parts List

5. PCB Diagrams

6. Block Diagrams

Samsung Electronics Co.,Ltd. Nov. 2004

Printed in South Korea.

Code No.: GH68-06167A

BASIC.

ⓒ

This Service Manual is a property of Samsung Electronics Co.,Ltd.

Any unauthorized use of Manual can be punished under applicable

International and/or domestic law.

1. SGH-P738 Specification

1-1

1. GSM General Specification

GSM900

Phase 1 EGSM 900

Phase 2 DCS 1800

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

SGH-P738 Speclflcation

1-2

2. GSM Tx Power Class

Tx Power

control level GSM900

533±3dBm

631±3dBm

729±3dBm

827±3dBm

925±3dBm

10 23±3dBm

11 21±3dBm

12 19±3dBm

13 17±3dBm

14 15±3dBm

15 13±3dBm

16 11±3dBm

17 9±3dBm

18 7±3dBm

19 5±3dBm

Tx Power

control level

DCS1800

030±3 dBm

128±3 dBm

226±3 dBm

324±3 dBm

422±3 dBm

520±3 dBm

618±3 dBm

716±3 dBm

814±3 dBm

912±4 dBm

10 10±4 dBm

11 8±4 dBm

12 6±4 dBm

13 4±4 dBm

14 2±5 dBm

15 0±5 dBm

2. SGH-P738 Flow Chart of Troubleshooting and Circuit Diagrams

2-1

1. Power On

check the current

consumption more

than 100mA Download again

'Power ON' does not work

Yes

END

Yes

Check the Initial Operation

Check U101 and C116

Yes

Check U101

pin 39 =

2.8V

No No

Yes

Charge the battery

Check the Voltage

of the Battery more

than 3.5V

check keypad

Check the pin11 of

U101 is more than

2.8V

Check

"Power On"

key?

check U101 and C117

Yes

U101 pin9

=1.8V

SGH-P738 Flow Chart of Troubleshooting and Circuit Diagrams

2-2

2. Initial

END

Yes

Check the signal at

the pin 21 of U101 is

"High" when the phone

is boot on

Initial Failure

Check pin4 of OSC402

Voltage is 2.8V ?

Check U401

Check pull_up R603,pin39 of U101,

OSC600, C613

Yes

Check pin5 of U103

Voltage is 2.5V?

Check or Change U300

Yes

Check pin3 of OSC600,

Frequency is 13MHz? Check or change OSC600

Check OSC300 is

working? No

Check the soldered status of U103,

U401

SGH-P738 Flow Chart of Troubleshooting and Circuit Diagrams

2-3

3. Sim Part

*TestwithSim

Check the pin 1 of

CN104. voltage 3V?

Phone can't access SIM card

Check the SIM

connector's (CN104)

connection to SIM

card

Check the circuit related to U101

Resolder or change CN104

END

Yes

Check the circuit

around CN104 input

circuitry Check the related circuit of CN104

Yes

Check the circuit

around U401 output

and voltage supply

circuitty

Check the related circuit of U401 and

U101

Yes

SGH-P738 Flow Chart of Troubleshooting and Circuit Diagrams

2-4

4.Microphone Part

* Call with Sim before testing.

Check the soldered

status of microphone

MicroPhone does not work

Resolder microphone

END

Yes

Check the reference

voltage on mic path

C201 ≒2.0V

Yes

Resolder or change

R203, C209, R204, R201, R200,

C200

Is microphone OK?

Yes

Check U501

SGH-P738 Flow Chart of Troubleshooting and Circuit Diagrams

2-5

5.Directional MIC Part

Directional MIC does not work

*When you play MPEG file, if Audio is not active

Check MIC "+" terminal,

Bias Voltage = 2.6V?

Yes

Resolder R249

Check pin21 of U200,

Voltage = 1.76V?

Yes

Resolder C244

Change directional MIC

Yes

SGH-P738 Flow Chart of Troubleshooting and Circuit Diagrams

2-6

6. Speaker Part

*Callbeforetesting.

Check the soldered

status of Speaker

Receiver does not work

Check the pin 7 of U202

"High"?

Resolder Speaker

Check U202 and the audio path of

U501

END

Yes

Is Speaker working?

Is Speaker working ?

Check the path from U501 to CN304

Change Speaker

Yes

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