CSL BB9300 Service Manual

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SERVICE MANUAL

1. Main Functions:

 -Audio Play/Video Recording
 -Master /SLAVE GSM 900/1800MHz
 -MMS/WAP
 -Bluetooth 1.2

2. Main Selling Points

 -BT communication
 -FM supporting
 -GPRS Class 12
 -Support MP3, MP4

3. Other Functions
 -Slide-Rotating

4. Spec

 -SIZE 75X70X15mm
 2.4" TFT 26K

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INTRODUCTION

The purpose of this document is to help service workshop technicians to service products. This service

TABLE OF CONTENTS

INTRODUCTION………………………………………………………………………………..3
Chapter 1 EXPLODED VIEW AND COMPONENT DISPOSAL………………………….4

EXPLODED DIAGRAM………………………………………………………………………….……...4
DISASSEMBL Y AND ASSEMBLY …………………………………………………………….………5

SERVICE TOOLS………………………………………………………………………………...5

DISASSEMBLE…………………………………………………………………………………...7
ASSEMBLY………………………………………………………………………………………..9

Chapter 2 SYSTEM BLOCK DIAGRAM……………………………………………………..11
Chapter 3 INSTRUCTION OF THE UNIT CIRCUIT………………………………………...12
Chapter 4 ACTUALL BOARD…………………………………………………………….….21

SIDE A (MASTER)…………………………………………..……………………………………….….21

SIDE B (SLAVE)……………………………………………………………………………………...….21

Chapter 5 TROUBLESHOOTING……………………………………………………………22
Chapter 6 SOFTWARE INSTRUCTION OF SW UPDATE………………………………..28

SW UPDATE OF MASTER……………………………………………………………..………………32

SW UPDATE OF SLAVE…………………………………………………………………………..……35

Chapter 7 FUNCTION TEST………………………………………………………………….39
Chapter 8 PARAMETER SETTING INSTRUCTION……………………………………….40
Chapter 9 CATCHER INSTRUCTION……………………………………………………….42

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manual must be used only by authorized service suppliers. The content of it is confidential. Please note that
provides other guidance documents for service suppliers. Follow these regularly and comply with the given
instructions. While every effort has been made to ensure the accuracy of this document, some errors may
exist. Please keep in mind also that this documentation is continuously being updated and modified, so
always watch out for the newest version.

CAUTIONS

Please refer to the phone’s user’s guide for instructions relating to operation, care, and maintenance,
which include important safety information.

1. Servicing and alignment must be undertaken by qualified personnel only.

2. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.

3. Use only approved components as specified in the parts list.

4. Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing and
alignment

5. Ensure all cables and wires are repositioned correctly

Electrostatic discharge can easily damage the sensitive components of electronic products. Therefore,
every service supplier must observe the precautions which mentioned above.

GENERAL REPAIR INFORMATION

1. Make sure your testing equipment is functioning properly before beginning repair work.

2. Before starting repairs you must observe ESD precautions such as being in your ESD
protected area and connecting your wristband.

3. Use gloves to avoid corrosion and fingerprints.

4. Cover windows and displays with a protective film to avoid dust and scratches.

5. Use a lint-free cloth to clean the LCD.

6. When cleaning the pads use a soft cloth\ ESD brush and isopropanol. Do not use a glass
fiber pencil: this scratches the surface and will corrosion.

7. Non-faulty mechanical parts(except shielding lids and bent parts or soldered components).
May be reused if they are not soldered.

8. When removing the shielding lids make sure to replace them with new ones, otherwise the
high-frequency leakage can affect the device.

9. Alw ays use the original spare parts.

10. Check the soldering joints of the parts concerned with regard to the fault symptom. And
resolder them if necessary.

11. Remove excess soldering flux after repair.

12. Observe the torque requirements when assembling the unit.

13. please aware that some malfunctions may be software related and solved by an update

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Chapter 1

EXPLODED VIEW AND COMPONENT DISPOSAL

EXPLODED DIAGRAM

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DISASSEMBLY AND ASSEMBLY

SERVICE TOOLS

Voltage regulator

Multimeter

Iron

850 heater

Constant temperature heater

Oscillograph

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Computer and software download cable

Wrist grounding strap, Antistatic gloves

Wrist
grounding strap

Antistatic gloves

Software
download cable

Microscope

Solder wire, soldering paste

Metal tweezers, Screw driver, SRT-6 Plates

Metal tweezers

SRT-6

Screw driver

MTK series CPU plate

Plate

soldering paste

Solder wire

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DISASSEMBLY

Take out the battery cover.

Remove 4 screws with screw driver.

Prize up the antenna by pick Prize up SIM buckle

Prize up D cover with pick Remove 2 screws with tweezer

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⑺ Take down FPC connector with pick

⑻ Take off PCBA by tweezer

⑼Take out C cover with hands

⑽ Take off 4 screws by tweezer

⑾ Prize up B cover with tweezer ⑿ Stick LCD film

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Finish

⒀ stick lens protection film ⒁ Take off receiver by tweezer

⒂ Separate LCD with pick

⒄ separate LCD PCBA with tweezer

⒃ Take off the screw with tweezer

⒅ Take off FPC

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ASSEMBLY

⑴ Place LCD PCBA in A cover ⑵ Lock the screw

⑹ Lock the screws with tweezer ⑸ install B cover

⑷Install receiver with tweezer

⑶ Install LCD

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⑺ Install cover C

⑿ Install the antenna ⑾Connect FPC with PCBA board

⑽ Lock 3 screws with tweezer

⑻ Place main PCBA in C cover

⑼ Tighten the FPC connector

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Finish

⒀ Lock 4 screws

⒁ Button the battery cover

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Chapter 2

SYSTEM BLOCK DIAGRAM

CPU (MT6235)

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Chapter 3

INSTRUCTION OF THE UNIT CIRCUIT

1. Instruction of the important ICs :

CPU is MT6235 which is the kernel IC of whole main circuit. It also integrates subsystems of channel coder and decoder, cross and

de-cross, encryption and decryption. It takes charge of process of voice and every parts of mobile, such as charge, liberation, LED

etc. And it includes WATCHDOG to improve system stability.

MT6235 is a new generation high-end chip made by MEDIATEK, with a QFN 11.5mm*11.5mm, up to 261pins, 0.47pitch. MT6235

baseband chip has GSM/GPRS capability, also integrates audio and video function. MT6253 provides not only high-quality GPRS

Class 12 MODEM, high-rate data transmission service, but also multi-media applications, like 0.3M pixels camera, mp3, mp4 etc

32k clock signal

BT control
signal

Keypad
signal

Flash signal

MT6235 CPU