C930ServiceManual

Level/2

Prepared by / Date
Reviewed by / Date
Reviewed by / Date
Granted by / Date

AMENDMENTHISTORY

S/N / Rev / Description of Change / Originator / Check / Approval
1 / 1.0 / Initial
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Contents

1.Objective...... 4

2.Scope...... 4

3.Definitionforterms...... 4

4.Responsibility...... 4

5.Detailprocedure...... 4

5.1. C930systemdiagram...... 5

5.2. Vibrationissue:...... 5

5.3. Keypad/side keyfunctionabnormity...... 6

5.4. Microphonefunctionabnormity...... 8

5.5. Headsetfunctionabnormity...... 8

5.6. Speakerfunctionabnormity...... 9

5.7. Earphonesfunctionabnormity...... 9

5.8. SIMcardtheoryandrepair...... 10

5.9. LCDdisplayabnormity...... 11

5.10. Camerafunctionabnomity...... 112 a) Tcardfunctionabnormity...... 14 b) Chargingfunctionabnormity...... 14 c) Charts...... 15

5.16.1. PositionCharts...... 15

5.16.2. Real object ...... 16

Annex...... 18

1.Objective

Thisdocumentoutlinestheservicemanual.

2.Scope

1.Use for radio analyzing in factory.

2.Use for radio analyzing in customer service.

3.Definition forterms

Nil

4.Responsibility

Nil

5.Detail procedure

5.1.C930 system diagram

5.2.Vibration issue:

Thevibratorcircuitissimple,onepointconnected toVIBRand the otherto GND.VIBRvoltage isapproximately equalto battery voltage,andVIBR voltage outputsfromthecorechip andiscontrolled by thesoftware. When vibrationenabled,the differentialvoltageofthevibratorisclose to3.0v,whenvibrationdisabled,thedifferential voltage iscloseto 0 v.

Repair steps:

1.CheckwhethertheVibratorisdamagedandthesoldering iswellor not;

2.Checkiftherelatedcircuits,,have solderingissues,etc;

  1. Replace withnew Vibrator, and verify again;

4.Enableanddisablevibrationfunctionsrespectively, checkwhetherbothendsoftheVibrator voltagearenormalornot.Ifabnormal,checkifthe U0100 hassolderingorperformance problems.

5.3.Keypad/side key function abnormity

Repair steps:

1. CheckifkeypadandDOMEaredamaged,theassemblyOK,andforeignmatterexist, etc;

2. Check ifthesurrounding components(mainly varistors)onthemainboard aredamagedand havesolderingissues, etc;

3.Replace with new keypad or sidekey,and verify again;

4. If you still have not found the problem, then check whether the U0100chip has solderingor performanceproblemsornot.

5.4.Microphone function abnormity

Repair steps:

1.Checkifthe microphone and leadiswell ,andsolderingiswell ;

2.Checkwhethertherelevant components havesoldering problems ornot;

3.Replace with new microphone, andverify again;

4.Enterthecallstate(orengineeringtestmode),measuringifmicrophone’sbiasvoltageis normal:thevoltageiswhenthemicrophoneworksabout 1.8V,and0V whenoff;

5.If you still have not found the problem, then check whether the U0100chip has solderingor performanceproblemsornot.

5.5.Receiver function abnormity

Repair steps:

1.Checkif the receiver shrapnel’s elasticity is well,and contact with PCB well;

2.Check iftherelevantcomponents havesoldering problems;

3.Replace with new receiver,and verify again;

4.If you still have not found the problem, then check whether the U0100 chip has solderingor performanceproblemsornot.

5.6.Speaker function abnormity

Repair steps:

1.Checkifthespeakerand the leadare well,andsoldering iswell;

2.Check iftherelevantcomponents havesoldering problems;

3.Replace with new speaker,and verify again;

4.If you still have not found the problem, then check whether the U0100 chip has solderingor performanceproblemsornot.

5.7.Earphone function abnormity

C927 earphone issharingone interface withUSB.

Earphone Detection:when theheadset isplugged into the phone,EINT_HEADSETsignal changes fromhigh leveltolow level,andCPU willtreatitas “earphones plugged”,and aearphonemark willdisplayed accordingly.

Headsetmicrophone on-hookand off-hook principle: generally,thereis ahook buttononthe earphone. Press the button, then MIC will short-circuit to ground, ADC_USB signal changes from highleveltolowlevel,whenthesignalisdetectedaslow,andthephoneisonincomingcall state,thenanswerthecall;ifthe phoneisonansweringcallstate,then end thecall.

Repair steps:

1.Checkiftheheadsetcanbedetectedbythephoneafterbeingplugged.Ifcannot,replace witha new headset andverify again;

2.Check iftherelevantcomponents havesoldering problems;

3.If you still have not found the problem, then check whether the U0100 chip has solderingor performanceproblemsornot.

5.8.SIM card theory and repair

C930 hasabuilt-indual-cardmanagementchip,andhastwoSIMcardconnectors,supports dualSIM dual standby.

Repair steps:

1.Checkifthedual-cards’insertiondirectionisOK;

2.Checkifthecardconnectormetalcontactpointshaveproblems,suchasexistingforeign mattersorarerusting,etc;

3.CheckiftheSIMcardconnectorsandcomponents around havesoldering problems;

4.Iffailedtofindoutproblems,checkwhetherU0100chipshavesolderingor performance issues.

5.9.LCD display abnormity

C930 LCD backlight isdirectlydriveby U0100,withoutextra drivecircuit.LCD data and controllinesconnect to LCDinterfacethroughthe capacitor, specificcircuitas follows:Repair steps:

1.CheckiftheLCD isdamaged,and FPChassolderingproblems;

2.Check if the relevantcomponents have soldering problems;

3.Replace with new LCD,and verify again;

4.If still failed to find out problems, check whether U0100 chip has soldering or performanceproblems.

5.10.Camera function abnomity

C930,configuredwitha 0.3millionpixelsmaincamera ,thedata andcontrol lines which connectto themainchip’scamera interface directly

.Themaincamera’spowersupplyisprovidedbyU0100 ,Specificcircuitsasfollows:

Repair steps:

1.Checkif thecamerahasquality problem,andFPChasassembly problem;

2.Checkifthecamera’spowersupplyvoltageisnormal, and components around J3 havesoldering problems;

3.Replace with newcamera,andverifyagain.

4.If still failed to find out problems, check whether U0100 chip has soldering or performanceproblems.

a)T card function abnormity

Repair steps:

1.Checkif the Tcardconnector’shasqualityproblem,metalcontactpointsabnormal;

2.Check ifTcardconnectorand componentsaround have solderingproblems;

3.If still failed to find out problems, check whether U0100 chip has soldering or performanceproblems.

b)Charging function abnormity

Repair steps:

1.CheckiftheUSB socket pinsrustorhavesoldering problems;

2.Checkifthebatteryconnector’smetalcontactwellornot,suchasexistingforeign matters,rustingorsolderingbadly,etc;

3.Check if the relevantcomponentsof thechargingcircuits have soldering problems;

4.Replace with new battery,andverify again;

  1. If still failed to find out problems, check whether U0100chip has soldering or performanceproblem
  2. Annex

Basebandfunctionstest undertheengineeringmode

1. Poweronthephone to the idlescreen,andinput"*#37*#"to enterthe"testmenu";

2.Select “Keypad”functiontest,andthe screen willpromptthecurrenttestingkey,then press thekey accordingly untilallthe keys are tested,andexit automatically.If a certainkey doesn’tworkorpressa wrongkey,thenthescreenwillshow thekey thatwilltest,and exitautomatically in5 secondswithoutaction.

3Select“LCD”functiontest,thescreenwilldisplay“red,green,blue,white,black”color withfullscreen,thenexitautomatically.

4 Select “Receiver,Loudspeaker,Echo Loop,”to Audio”functiontest

A. Select “Receiver” function test,ifneed to doagingtest for receivercomponents,you can set “Play time, Interval time, Loop times” . Otherwise youcan press “OK” key to start theReceivertestdirectly.Andpress“OK”key againtochange tothespeakertest;

B.Select“Loudspeaker”function test,ifneedtodo agingtest forspeakercomponents, youcanset“Play time,Intervaltime,Looptimes”.Otherwiseyoucanpress“OK”key to start the speaker test directly.

C.Select“EchoLoop” function test,speaktothemainmicrophone,thencanhearthe voicefromthe receiver. Inserttheearphones,then press “Ok”key tochangeto theearphone test.Now speakto the microphone ofthe earphoneline,then can hear the voicefromthe earphones.

5Select“Vibrator”functiontest,ifneedtodoagingtestforthevibratorcomponent,you canset“Vibratortime,Interval time”.Otherwisepress“OK”keytostartthevibrator test directly;

6Select “LED”function test,theLCD backlightflicker,immediatelyfollowing,the keypad lightwillflicker,then exit automatically;

7Select“Memory Card”functiontest,thescreendisplays “Writing…”firstly,afteramoment,it displays “Playing…”, now speakerwillplay sound,and thenexitautomatically;

8.Select“FM”functiontest,youneed toinserttheearphones toentertheFM mode;press “Leftkey”or “Right key”tosearchchannelsandreceiveradio.Press“OK”keytoclose the FMfunction when exiting;

9 .Select“Charger”functiontest,ifthephonehaschargedthroughaDCchargerorUSB

cable,the screendisplays “Pass”, otherwise “Please insert charger”;

10Select“ADC”functiontest,thescreendisplaysthecurrentvoltageandtemperatureof thebattery;