Micromax A74 L1 Service Manual Download Page 27

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Checking the connector of T

–card and SIM card;

Change the connector of T

–card and SIM card;

10.No SIM card and No memory card

Repairing guide

T-card

connector

SIM

Connector

Summary of Contents for A74 L1

Page 1: ...A74 L1 L2 service manual...

Page 2: ...2 content 1 Product introduce p3 p4 2 Disassembly guide p5 p17 3 Structure parts diagram p18 4 Repairing guide p19 p29...

Page 3: ...3 Product introduce...

Page 4: ...RAM System Android 4 2 Frequency band WCDMA 2100 GSM 900 1800MHz Battery 1500mAh charger Travel charger USB cable MICRO 5PIN earphone 3 5jack LCD TP 4 5 FWVGA Capacitance TP Camera 0 3M and 5 0M CMOS...

Page 5: ...5 Hot gun Tweezer Solder iron Tommy bar Cross Screw driver 1 Tools list Tweezer Cross screw driver Solder Tommy bar hot gun Disassembly guide...

Page 6: ...6 2 Battery caver disassembly open the battery cover as the Fig 1 Fig 1 Disassembly guide Battery cover...

Page 7: ...7 3 Back caver disassembly 1 Unscrew 12 screws in back cover as the Fig 2 Fig 2 Disassembly guide...

Page 8: ...8 Fig 3 2 Disassemble back cover with Tommy bar as the Fig 3 Disassembly guide Back cover SPK...

Page 9: ...over disassembly 1 The main components of distribution as the fig 4 Fig 4 Disassembly guide Main PCBA LCD con Front CAM con Back CAM USB con Earphoe con TP con T card con SIM con Main FPC Sub PCBA vib...

Page 10: ...2 remove two screws and open the LCD con TP con and remove the volume key FPC power key FPC as the fig 5 10 Fig 5 Disassembly guide TPcon LCDcon...

Page 11: ...3 open the main board and remove the RF cable con And main FPC con as the FIG 6 11 Fig 6 Disassembly guide RF cable con Main FPC con Main board...

Page 12: ...remove the light sensor and camera as the fig 7 12 5 Front and Back camera light sensor disassembly Fig 7 Disassembly guide Back cam Front cam Light sensor holder Light sensor con...

Page 13: ...13 Fig 9 remove the Speaker camera and receiver as the FIG 9 7 Speaker receiver disassembly Disassembly guide receiver...

Page 14: ...14 Fig 10 8 RF cable and Main FPC disassembly Remove the RF cable and Main FPC as the fig 10 Disassembly guide RF cable Main FPC...

Page 15: ...15 Fig 11 9 Sub PCBA disassembly remove the sub PCBA from the as the fig 11 Disassembly guide Sub PCBA vibrator...

Page 16: ...16 Fig 12 10 MIC disassembly Remove the MIC as the fig 12 Disassembly guide MIC con...

Page 17: ...17 Structure parts diagram 3in1 module LCD TP front cover Back cover Battery cover Main PCBA sub PCBA 5M camera 0 3M camera Main FPC Light sensor Sensor holder receiver SPK RF cable...

Page 18: ...o upgrade the SW b Check the LCD if is ok otherwise change a new LCD c If that the LCD loose re assemble the LCD and test d Checking the LCD connector if is ok otherwise re solder it or change a new o...

Page 19: ...sing the good camera to do cross test it can check if the camera is ok c Checking the camera connector if is ok as below picture otherwise to re solder or change a new one d Checking the circuit aroun...

Page 20: ...de the SW b Checking the FPC of TP and re assemble it c Using the good TP to do cross test d Checking the TP connector otherwise re solder or change a new one e Checking the circuit around the TP conn...

Page 21: ...hecking the shrapnel of speaker if is ok b Checking the resistance of speaker if is ok otherwise to change a new one c Checking the FPC if is ok d Checking SPK FPC if connector with sub board is ok Re...

Page 22: ...nel of receiver if is ok b Checking the resistance of receiver if is ok otherwise to change a new one c Checking the connector point on the main board if is ok as below picture c Checking the receiver...

Page 23: ...ing the MIC and Vibrator is cold soldering re solder it b Change the MIC and Vibrator c Checking the circuit of MIC and Vibrator d Checking the FPC if connect ok 23 6 MIC and Vibrator Repairing guide...

Page 24: ...the shrapnel of earphone if is ok b Checking the connector point on the main board if is ok as below picture c Change earphone connector c Checking the circuit of earphone 24 7 Earphone Repairing guid...

Page 25: ...a Checking the voltage of battery if is 3 8 4 2V and connect ok b Upgrade the SW b Checking the power on key and circuit around it 25 8 No Power On Repairing guide Power On...

Page 26: ...a Checking the voltage of battery if is over 3 4V b Checking the charger and USB cable if is ok c Checking the USB connector and circuit if is ok 26 9 No charging Repairing guide USB Connector...

Page 27: ...a Checking the connector of T card and SIM card b Change the connector of T card and SIM card 27 10 No SIM card and No memory card Repairing guide T card connector SIM Connector...

Page 28: ...a Checking RF line if that is broken b Checking RF line assemble if is ok 28 11 Signal Repairing guide RF connector Sub board RF connector...

Page 29: ...End Q A...

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Micromax A74 L1, Service Manual

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