Samsung SGH-Z720 service manual.pdf

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UMTS TELEPHONE

SGH-Z720

UMTS TELEPHONE

10.

CONTENTS

Safety Precautions

Specification

Product Function

Array course control

Exploded View/Disassembly

and Assembly Instructions

MAIN Electrical Parts List

Block Diagrams

PCB Diagrams

Flow Chart of Troubleshooting

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 and Parts List

5-1. Cellular phone Exploded View ..................................................................................5-1

5-2. Cellular phone Parts list ............................................................................................5-2

5-3. Disassembly and Assembly Instructions....................................................................5-4

6. MAIN Electrical Parts List

7. Block Diagrams

7-1. RF Solution Block Diagram........................................................................................7-1

7-2. Logic Block Diagram...................................................................................................7-2

8. PCB Diagrams

CONTENTS

9. Flow Chart of Troubleshooting

9-1. Power On..................................................................................................................9-1

9-2. Initial ..........................................................................................................................9-3

9-3. Charging Part ...........................................................................................................9-4

9-4. Sim Part....................................................................................................................9-6

9-5. Microphone Part-Phone MIC ...................................................................................9-8

9-6. Microphone Part-Earphone MIC.............................................................................9-10

9-7. Earphone Part.........................................................................................................9-12

9-8. Speak Part..............................................................................................................9-14

9-9. Key Data Input.......................................................................................................9-16

9-10. LCD Part...............................................................................................................9-17

9-11. Camera Part..........................................................................................................9-19

9-12. LCD Back Light.....................................................................................................9-21

9-13. Key Back Light.....................................................................................................9-23

9-14. GSM Receiver.......................................................................................................9-25

9-15. GSm Transmitter...................................................................................................9-27

9-16. DCS Receiver.......................................................................................................9-29

9-17. DCS Transmitter...................................................................................................9-31

9-18. PCS Receiver ......................................................................................................9-33

9-19. PCS Transmitter...................................................................................................9-35

9-20. WCDMA Receiver.................................................................................................9-37

9-21. WCDMA Transmitter.............................................................................................9-39

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 the specification 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

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