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DBTEL Incorporated

DB-6568 Service Manual Level 1 ~ 3

2003.11.13

DBTEL Copyright Reserved

Page 28 of 66

5. DB6568 Repair and Test Steps

5.1

Basic Knowledge for Handset Maintenance/Repair

This Chapter introduces the frequently encountered handset defects, possible cause and

recommended solution.

5.1.1 Classification of Possible Cause

一

.

Menu Setting Issue

：

Failure operation due to menu setting is not defined as malfunction. For example: no

response for incoming call, it is probably the call divert has been set; failed to make a phone

call, probably setting of call barring; no audio tone in calling, probably setting of low audio

volume. These mostly happened to fresh users, therefore service/repair technician are

required to be familiar with the operation of any kind of GSM handset.

二

.

Operational Issue

：

Improper operating or adjustment would normally be the cause of defects.

The frequently encountered malfunctions are as below:

1.

Mechanical damage

: Broken or deformation of handset components and IC pin that

caused by violent usage or misusage, such as antenna deflection or broken, housing

broken caused by dropping, failure operation caused by dropping into water, LCD lens

cracking, … etc.

2.

Improper usage

: Some instances listed following: Keyboard being worn out that

caused by finger nail during operation; damage to internal charging circuit that caused by

using non-manufacturer approved charger; incorrectly setting of handset menu causes

some of the functions failed to function properly; SIM card self locked due to the attempt to

deactivate SIM card blocked after entering wrong PIN number in 3 succession times.

3. Improper maintain

: Mobile phone is a high tech precision product. It should be stored or

used under dry and moderate temperature environment.

三

. Quality Issue

：

Handset that is not released by authorized retailer will be experiencing unexpected quality

due to the reassembly or re-equipment with none QC components or parts. Some of the

digital handsets will not function properly as it does not comply with GSM system.

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Содержание DB-6568

Страница 1: ...DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 1 ...

Страница 2: ...vice 13 3 1 5 Clock 13 3 1 6 Settings 14 3 1 7 Miscellaneous 14 3 1 8 WAP 15 4 Disassembly Assembly 16 4 1 Introduction to disassemblyand assembly 17 4 2 Tools required 17 4 3 Exploding Diagram and Part List 18 4 4 Disassembly steps 19 4 5 Assembly steps 21 5 Troubleshooting Testing 23 5 1 Basic knowledge of Handsets repair 24 5 1 1 Class of defect cause 24 5 1 2 Class of Defect 25 5 1 3 Troublesh...

Страница 3: ...DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 3 5 9 Function Test and Verification 64 6 Accessories 65 ...

Страница 4: ...evel 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 4 1 General 1 1 Introduction 1 2 Safety Notes 1 2 1 For Handset Users 1 2 2 For Mobility Portability Phone Users When Used in Vehicles 1 2 3 General Safety Notes ...

Страница 5: ... body close to antenna especially the face or eyes while communications You should use correct method while calls For your healthy avoid directing the antenna to your head l Do not use handset when in airplane Switched off the phone before boarding an aircraft The use of a cellular telephone in an aircraft may be dangerous to the operation of the aircraft disruption of the Cellular Network may occ...

Страница 6: ...n death l Mobile Telephones are under certain conditions capable of interfering with electromagnetic l Switch off the phone when you are in the vicinity of such workplace if any regulations posted in these areas instruct you to do so l Mobile telephone will automatically transmit or receiving signal if it is not turned off even in standby mode l Refer to the related section of the user manual for ...

Страница 7: ...DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 7 2 DB 6568 Introduction 1 3 DB 6568 Cosmetic Diagram 1 4 Specifications List 1 5 Electrical Specifications List ...

Страница 8: ...DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 8 2 DB 6568 Introduction 2 1 DB6568 Cosmetic Diagram ...

Страница 9: ...ng StandardBattery in good signal intensity GSM 900 100 hours BSPA 2 DCS1800 100 hours BSPA 9 l Charging Time 120 minutes 90 capacity l Phone Book 100 sets Phone Book embedded in handset 200 sets Phone Book embedded in SIM l Vibrator Vibration for Call Alert l LCD Display 128x128dots Full Graphic LCD 4 line including soft icons l Key pads 12Telphone keys Up Down Power Softbutton fast menu l Backli...

Страница 10: ...eft l Channel Spacing 200KHz l Modulation Type GMSK BT 0 3 l Transmission Rates 270 833 kb s l Speech codes FR 13kbps EFR 13kbps AMR l Communication Control Protocol GSM Phase 2 Frequency Stability in static condition 0 1ppm 0 1ppm l Transmitted Phase Error 5 RMS 20 PEAK 5 RMS 20 PEAK l RF Output Power GSM900 DCS1800 33dBm 2 0dB Class 4 30dBm 2 0dB Class 1 32dBm 0 6 dB 29dBm 0 6dB at RF Interface ...

Страница 11: ...DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 11 3 Function List 3 1Useful Function List l DB6568 l 3 Menu Tree Table ...

Страница 12: ... Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved DBTEL Incorporated 12 3 1 Menu Tree function Table 服务 1 2 3 4 5 6 7 8 9 10 Call Meters Phone Books Screen Function LIST Date Ti Mode Setting Message Extras Wap STK ...

Страница 13: ...ect SIMAll Handset All Delete One Entry Entries SIMAll Handset All Family All Friend All Workmate All VIPAll Others Fixed Dial Control On Add new View Delete Speed Dial View Change Delete Phone Status SIM Handset 2 Call Meters Recent Call Missed Received Dialed Calling Display Call Timer Dialed Received Lifetime Finally Call Timer Reset Call Charge Money Balance Call Setting Call Money Setting Dur...

Страница 14: ... Duration 10 Seconds 15 Seconds 30 Seconds WelcomeNote Save Delete 4 Mode General Activate Settings Call Alert Ringing Tone Volume Level Key Volume Silent Activate Settings Call Alert Ringing Tone Volume Level Key Volume Meeting Activate Settings Call Alert Ringing Tone Volume Level Key Volume Outdoor Activate Settings Call Alert Ringing Tone Volume Level Key Volume Customzied Activate Settings Ca...

Страница 15: ...t Time Calendar Set Date Date Time Set Date Set Time Display Mode No Display Date Only Time Only Date Time Power Off Off Once Set Time Everyday Set Time Power On Off Once Set Time Everyday Set Time Date Time Format Date Format YYYY MM DD DD MM YYYY MM DD YYYY Time Format 12 Hour 24 Hour Stopwatch Count Down Set Timer Time Zone View Change ...

Страница 16: ...arphone Volume Key Lock Auto Keypad Lock Now Anykey Answer Off On Auto Answer Off On Factory Settings Call Settings Own Number Sending Off Sending On Automatic Redial Off On Call Divert All Calls When Busy No Reply No Response Cancel All Call Barring All Calls Outgoing Int Out Ex Home All Calls When Roaming Cancel All Call Waiting Status Activate Deactivate ...

Страница 17: ... Code Short Cut Key Up Key Long Down Key Long Left Key Long Right Key Long 7 Extras Calculator JAVATM JAVATM List About JAVATM Games FiveChess Redcap Blackjack Tank War Game Setting Volume Schedule Notebook View Today Records Everyday Every Week Every Month Every Year All Records Add new Edit Detail set Save Delete One Entry All Records Data Download Area Download Melodies Download Wallpapers ...

Страница 18: ...sten To Voice Message Voice Mailbox Number Broadcast Broadcast Off On Channel Show List Add To List Settings Validity Period 1 Hour 6 Hours 12 Hours 1 Day 7 Days 15 Days 30 Days SMS Center 9 WAP Homepage Bookmarks Bookmark 1 5 Last Page Navigation Empty Cache Settings Profiles China Mobile China Unicom WAP Profiles 3 Features Image Download Character Set Bearer History 10 STK The availability depe...

Страница 19: ...ervice Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 19 of 66 4 Disassembly Assembly 4 1 Introduction To Disassembly Assembly 4 2 Tool Required 4 3 Exploding Diagram Parts List 4 4 Disassembly Steps 4 5 Assembly Steps ...

Страница 20: ...rist ring when disassemble and assemble any handset Do not place any heavy object on mobile housings or You will damage the mobile Notice 4 2 Tool Required We suggested that use the following tools to disassemble and assembleDB 6568 ESD Protection Tools including n ESD Protection Pad n Grounded Wire n Grounded Wrist Ring n Plastic Blade n T6 Torx Screwdriver n Pliers 4 3 Exploded Parts Diagram l D...

Страница 21: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 21 of 66 ...

Страница 22: ...nual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 22 of 66 4 4 Disassembly Steps l DB6568 1 Open Battery Pack 2 Take Off Screw Nuts 3 Open From Rear Housing 4 Disassemble Hooks On Both Sides 5 Take Off Ear Phone Cover 6 Take Off PCBA ...

Страница 23: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 23 of 66 9 Take Off Receiver 10 Complete Disassembly Steps 8 Take Off Rubber Keypad 7 Take Off Microphone ...

Страница 24: ...eck Tools Materials Tools Materials In Place 2 Do Not Scratch when disassemble the housings acrylate panel 3 There are 4 hooks on F R Housings Do not make hooks broken when disassemble F R housings 4 5 Assembly Steps l DB6568 1 Attach LCD Sponge On Fro Housing 2 Mount Receiver place as shown 3 Mount Rubber Keypad 4 Mount Microphone ...

Страница 25: ... Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 25 of 66 5 Ear Phone Jack Mounted as shown 8 Tightened 4 Screw Nuts 7 Close Up F R Housing 6 Then Put Into Housing Slightly 9 Fix cover of srew and light pillar ...

Страница 26: ...ling process 3 Take notice of the 4 hooks that are easily broken at the rear housing Not to apply too much force when reassembling 4 Ensure that the receiver microphone and all other components or parts are mounted in proper places and check that the receiver pin is not distorted and check that the vibrator connector is securely connected and receiver connector have not deformation 5 Be sure that ...

Страница 27: ... Classification Of Cause 5 1 2 Classification Of Malfunction 5 1 3 Repairing Guideline 5 1 4Maintenance Repair Workplace Environment 5 2 Introduction Of DB6568 Troubleshooting 5 3 DB6568 Mechanical Repair 5 4 Manual Test 5 5 Basic Module Failure Analysis 5 6 Troubleshooting Procedure 5 7 Testing Items After Repairing 5 8 Software Upgrading 5 9 Functional Test and Verification ...

Страница 28: ...are as below 1 Mechanical damage Broken or deformation of handset components and IC pin that caused by violent usage or misusage such as antenna deflection or broken housing broken caused by dropping failure operation caused by dropping into water LCD lens cracking etc 2 Improper usage Some instances listed following Keyboard being worn out that caused by finger nail during operation damage to int...

Страница 29: ...ailure The above 3 categories are correlated for example the defect of handset software may affect the input voltage phase lock loop in reception transmission circuit transmission power level control reception transmission circuit time division synchronization and also the hardware circuit timing signal that provided by oscillator of reception transmission circuit for software operation may affect...

Страница 30: ...cking is allowed 六 From simple to complex and easy to difficulty This is a basic principle of maintenance Do not disassemble the handset unless it can hardly be determined by checking the surface or operation of handset 七 Checking PCBA carefully Some of the defects can be detected visibly and no further testing procedures is required For example IC wouldn t generate high temperature while working ...

Страница 31: ...3 DBTEL Copyright Reserved Page 31 of 66 display microphone earpiece and vibrator are working properly 十二 Always follow the standard procedures for handset assembling disassembling For assembling disassembling process refer to chapter 4 十三 Keep a repairing record ...

Страница 32: ...ng to place components disassembled parts Prepare tools and instruments such as table lamp magnifying glass soldering iron solder fountain heat gun volt meter power supply and oscilloscope etc 三 Notes Connect all grounded lines of instruments together to prevent ESD damaging CMOS circuit of Mobile Do not superpose instruments each other You must notice proper ventilation in order to ease heat disp...

Страница 33: ...er Rubber Keypad Antenna etc b Simple menu test commands Use manual test command to check SW version function of Vibrator LCD module Buzzer Microphone and speaker 三 3rd level Repair including components PCBA modules Circuit and parameters of SW a Disassembling handset components or parts including SMD components shielding case BGA IC SIM card holder RTC battery and holder vibrator connector batter...

Страница 34: ... test card for manual test checking By only entering a series of manual test commands for certain function service repair technician can accomplish the services easily There are two manual test command modes each has different function This chapter will explain the functions commands operational method of this 2 modes Manual test mode 1 Normal SIM card or Test SIM card Step 1 Insert test card and ...

Страница 35: ...isplay Green LCD test 3 LCD display BLUE LCD test 4 LCD display White LCD test 5 LCD display Black LCD test 6 Replace LCD again Option RINGER test 1 ringer on 2 ringer off Option VIBRATOR test 1 vibrator on 2 vibrator off Option CHECKSUM test 6M test 8M test Option WAKEUP test 1 Show wakeup test 2 wakeup string show 3 wakeup string not show Option recover SIMLOCK initialization Option RELOAD relat...

Страница 36: ...orporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 36 of 66 5 5 Basic Module Failure Analysis 1 PCB Overview 1 1 Main Board Top Side Overview 1 2 Main Board Bottom Side Overview ...

Страница 37: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 37 of 66 ...

Страница 38: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 38 of 66 2 1 Clock Block Diagram ...

Страница 39: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 39 of 66 2 2 Base Band Block Signal Diagram ...

Страница 40: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 40 of 66 2 3 RF Block Diagram ...

Страница 41: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 41 of 66 3 Power Supply ...

Страница 42: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 42 of 66 3 2 RF Power Supply ...

Страница 43: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 43 of 66 4 Component 4 1U20 RF Switch Vc1 VC_DCS Vc2 VC_GSM 4 2 U22 GSM RX Filter 4 3 U23 DCS RX Filter ...

Страница 44: ... supply 3 4 5V working voltage 2 Make U301 out put signal controls U10 PIN 7 When low voltage 0 0 1 V select PIN 1 GSM input signal 880 915 MHz 0 dBm When high voltage 2 2 8 V select PIN 8 DCS input signal 1710 1785 MHz 0 dBm 3 By U30 output signal 0 2 2 2 V supply U104 PIN 2 supply to PIN 4 as GSM coefficient of amplify signal or as PIN 5 DCS coefficient of amplify signal 4 5 U40 GSM TX COUPLER ...

Страница 45: ...tage we use U501 pin VCC_RX_TX to supply 2 7V 2 When PIN 8 controlled by PON_TX of U301 U30 not working when low voltage 0 0 3 V When high voltage 0 9 2 7 V U30 will depends PIN 4 5 feedback signal 3 2 7 V and U301 RAMP signal after calculated by way of PIN 1 output signal to control U10 amplify coefficients 註 PIN 1 output signal controls U10 amplify coefficients is up to temperature and output ...

Страница 46: ...l of U301 When high voltage 2 0 2 9 V is GSM MODE output is by way of PIN 1 PIN 2 is low voltage 0 0 3 V at this time PIN 2 is controlled by U301 DCS signal When high voltage 2 0 2 9 V is DCS MODE 由 output is by way of PIN 5 PIN 4 is low voltage at this time 0 0 3 V 3 When it is GSM MODE PIN 8 supplies 0 8 3 0 V by U110 PIN 1 will output 880 915 MHz 2 6 5 dBm signal When it is in DCS MODE PIN 8 is...

Страница 47: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 47 of 66 4 9 U110 TRANSCEIVER ...

Страница 48: ...hat is converted from U501 VCC_SYN The 2 7V RFLOVCC is supplied by U501 VCC_SYN The 2 7V SYNVCC is supplied by PIN_23__SYNVCC that is converted from U501 VCC_SYN 2 There are 2 sets of Charge Pump signals supplied by chipset TXVCP and RFVCP respectively and supplied by U501 VCC_CP 4 0 V The 0 4 3 6 VCC 0 4 requested voltage is generated by way of chip voltage divider 3 The are 3 sets logic input st...

Страница 49: ...pyright Reserved Page 49 of 66 4 10 U61 13MHz CRYSTAL 1 PIN 4 consumed 2 4 0 1 V and is supplied by VCC_REF converted from U87 2 The 1 1 0 8 V of PIN 1 is generated by AFC of U301 the adjusted range is 10 20 PPM 3 The output of PIN 3 is 13 MHz 0 8 Vp p signal 4 11 U301 MCP ...

Страница 50: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 50 of 66 ...

Страница 51: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 51 of 66 1 Power and Ground ...

Страница 52: ...ed Page 52 of 66 The chipset included Reference Voltage ON OFF Logic Clock RF Control Interface Base Band Interface Audio Interface I2C Bus Memory Interface Memory Control Keyboard Scanner Keyboard Uart0 Uart1 GPIO Port Pulse Width Modulator JTAG and Test Access Port Power Down Control ...

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Страница 55: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 55 of 66 4 13 Supply Controller and SIM interface ...

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Страница 62: ...DBTEL Incorporated DB 6568 Service Manual Level 1 3 2003 11 13 DBTEL Copyright Reserved Page 62 of 66 4 15 U601 Battery Management I C ...

Страница 63: ...ttery not click into place Serious deformation of rear housing or wide gap between rear housing and battery might have occurred Replace the deformed rear housing or void battery button If take actions as above but still cannot improve defection It may be caused by PCB this handset should be transfer to higher service level SYMPTOM 2 No display or partially display on LCD LEVEL PROBABLE CAUSE VERIF...

Страница 64: ...ctions as above but still cannot improve defect It may be caused by PCB this handset should be transfer to higher service level SYMPTOM 5 Defect in handfree earphone Command 80 àselect Change audio loop test item LEVEL PROBABLE CAUSE VERIFICATION AND REMEDY 1 Defect in handfree The headset might not function well Connect a working headset to mobile phone and verify that the conversation is smooth ...

Страница 65: ...ive microphone with a new or working one If take actions as above but still cannot improve defect It may be caused by PCB this handset should be transfer to higher service level SYMPTOM 8 Cannot charge power LEVEL PROBABLE CAUSE VERIFICATION AND REMEDY 1 Battery defect he battery might have worn out Install a working battery and start charging Make sure that it functions well Replace the defective...

Страница 66: ... cannot solve replace a good one If take actions as above but still cannot improve defect It may be caused by PCB this handset should be transfer to higher service level SYMPTOM 10 Some of the Rubber keys are not working LEVEL PROBABLE CAUSE VERIFICATION AND REMEDY 2 Rubber Key defect The Rubber Key might have been defected Install a working Rubber Key onto handset and test it with key pressing to...

Страница 67: ... with the normal operation to ensure that it operates properly Recommend user to contact with the Network Operator for necessary solution 2 Screws are loosely secured Screws might have not been tightened securely onto the front and rear housing Ensure there is no wide gap between front and rear housing preventing the SIM Card contact with SIM card holder Tighten the loosen screws or replace with n...

Страница 68: ... upgrading 1 Testing with Manual Test Mode Command after upgrading this is to ensure that the software version is correct 2 Operating menu options to verify that the functions are working properly 3 Testing new updated function after upgrading Ensure that the function is available for use Charger replacement 1 Charge to the handset with the replaced charger to verify that the charger is working wi...

Страница 69: ...e LCD test 5 LCD display Black LCD test 6 Replace LCD again Option RINGER Test 1 Ringer ON 2 Ringer OFF Option VIBRATOR Test 1 Vibrator ON 2 Vibrator OFF Option CHECKSUM Test 6M Test 8M Test Option WAKEUP Test 1 Show wakeup test 2 wakeup string show 3 wakeup string not show Option Recover SIMLOCK Default Value Option RELOAD Relative Definition 1 Recover Keypad Original Defaults 2 RELOAD AUDIO TAB ...

Страница 70: ...on visibly to verify that it is not deformed 5 Power on the handset key in 80 the LCD full display to check that the LCD is not skewed 5 7 2 3 Instructions for replacing rear housing and circuit board 1 Rear housing replacement Remove all the labels IMEI Label CIT Label DSN Label on the rear housing carefully without tearing off the labels A heat gun could be used for easy tearing but do not heat ...

Страница 71: ...r to DB6568 Service Center Utility Operation Manual l Software upgrading instructions 1 Avoid using other applications during downloading otherwise it will interrupt the downloading progress 2 Battery level indicator shall reach at least level 2 for optimum downloading 3 Well control of the software version 4 AMD is the manufacturer of FLASH ROM 5 If handset is no response after powering on check ...

Страница 72: ...des testing for PCB power supply reception and transmission intermediate frequency reception baseband frequency reception and transmission local oscillation frequency and other parameter of major power supply 二 Handset test Testing for the whole unit to ensure that the handset achieves its best performance Verifying sound and voice quality by making or receiving phone call Check that the vibrator ...

Страница 73: ...t accompany with AC Adapter l Power Transformer Power transformer is connected to Desktop charger or directly connected to handset When it is directly connected to handset Power transformer can charge battery or discharge it l Mobile Charger The Mobile Charger is provided to ensure your phone is always ready for use whenever you travel in a car When you use handset the battery function is in place...

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