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D303
1：Technical Specifications
Particular
Key Matrix For Flashing
Chipset
Android Version
Frequency
Network Mode
Rom
RAM
Internal SD Card memory
Expandable Memory
Factory mode code
Good Earpiece volume
Good Loudspeaker volume
Good MIC volume
Good Vibrator volume
Remarks
NA
MT6572W
Android4.4
1.3GHz
850MHz/900MHz/1800MHz/1900MHz B1, B8
4G
512MB
2G
32G
Press vol+/ Vol-/ power key at the same time
32Ω± 15%
8Ω± 5%
2.2kΩ± 5%
30Ω± 5%
L3 Service Manual
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Summary of Contents for Micromax D303
- Page 1 D303 L3 Service Manual 1：Technical Specifications Particular Remarks Key Matrix For Flashing Chipset MT6572W Android Version Android4.4 Frequency 1.3GHz Network Mode 850MHz/900MHz/1800MHz/1900MHz B1, B8 512MB Internal SD Card memory Expandable Memory Factory mode code Press vol+/ Vol-/ power key at the same time Good Earpiece volume 32Ω±...
- Page 2 D303 L3 Service Manual 2：CAUTIONS Flashing & Servicing must be undertaken by qualified personnel only. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn. III. Use only approved Tools & components as specified in the parts list.
- Page 3 D303 L3 Service Manual 1. Unable to load Software: Solution: First check the computer can recognize the device or not, if not, Re-load it. Then check the USB port to master control circuit is normal or not.： format the flash and upgrade again if fail in the Proceed of downloading.
- Page 4 D303 L3 Service Manual Solution: Flash the handset with latest SW heck the battery have capacity or not ,if not ,Change it Charging with transferred to 4.0 V dc power supply to the mainboard on battery Reordering ,check The mainboard work current, the normal starting current will be from 100 ma jump to light screen ...
- Page 5 D303 L3 Service Manual Flash the handset with latest SW Plug in the charger to check whether the machine has a charging icon, if don’t have, then check the 5V power pin of USB port connect the mainboard or not ...
- Page 6 D303 L3 Service Manual Flash the handset with latest SW Check the connect ribbon cable saddle normally or not ,Re-assembly LCD. Check the LCD connector work normally or not, Re-Solder LCD connector Check the CPU work normally or not, Re-Solder CPU or change it LCD slot 5.
- Page 7 D303 L3 Service Manual Flash the handset with latest SW Check the connect ribbon cable saddle normally or not ,Re-assembly TP. Check the TP slot work normally or not, Re-Solder TP slot ; Check the CPU work normally or not, Re-Solder CPU or change it TP slot 6.
- Page 8 D303 L3 Service Manual Check the connect ribbon cable saddle normally or not ,Re-assembly LCD. Check the LCD connector work normally or not, Re-Solder LCD connector or change it Check the Back driver work normally or not, Re-Solder Back driver or change it;...
- Page 9 D303 L3 Service Manual Check if the SIM card is obviously damaged, if yes, Replace the SIM card socket Check if the ground impedance of each pin of the SIM card socket(except the ground pin)is low(lower than grade ),if yes, Replace the varistor of the corresponding pin;...
- Page 10 D303 L3 Service Manual Check if the ground impedance of each pin of the SD card socket(except the ground pin)is low(lower than grade ),if yes, Replace the varistor of the corresponding pin; Check if the series resistors on each network of the SD card have pseudo soldering ,if yes, Carry out repair soldering of the series resistors on each signal line;...
- Page 11 D303 L3 Service Manual Check if the ground impedance of each pin of the Camera connector (except the ground pin)is low(lower than grade ),if yes, Replace the varistor of the corresponding pin; Check if the series resistors on each network of the Camera connector have pseudo soldering ,if yes, Carry out repair soldering of the series resistors on each signal line;...
- Page 12 D303 L3 Service Manual Check if the ground impedance of each pin of the Camera connector (except the ground pin)is low(lower than grade ),if yes, Replace the varistor of the corresponding pin; Check if the series resistors on each network of the Camera connector have pseudo soldering ,if yes, Carry out repair soldering of the series resistors on each signal line;...
- Page 13 D303 L3 Service Manual Check the power IC work normally or not. Re-Solder the power IC or change it Check the CPU work normally or not. Re-Solder the CPU or change it 12. Receiver not working: Solution: ...
- Page 14 D303 L3 Service Manual Check Earphone connector also , If Earphone connector got shorted : MIC & Receiver will not work Check the Power ic work normally or not. Re-Solder the Power IC or change it Check the CPU normally or not, then Re-Solder CPU or change it.
- Page 15 D303 L3 Service Manual Check the CPU work normally or not. Re-Solder the CPU or change it Power IC Receiver Slot 14. Earphone not working: Solution Flash the handset with latest SW Check the earphone normally or not, then change it;...
- Page 16 D303 L3 Service Manual Check the CPU normally or not, then Re-Solder CPU or change it. Earphone Earphone Power IC connector 15. G SENSOR not working: N/A 16. FM not working: Solution: Flash the handset with latest SW ...
- Page 17 D303 L3 Service Manual Check the first foot of earphone have good connect with earphone line or not. then Re-Solder earphone connector or change it Check the Power IC normally or not, then Re-Solder Power IC or change it.
- Page 18 D303 L3 Service Manual 18. BT is not working fine: Solution: Check BT 11 to 30 S if these are working fine。 Flash the handset with latest SW Check the BT/WIFI/GPS/FM Chip normally or not, then Re-Solder Power IC or change it.
- Page 19 D303 L3 Service Manual Bt/WiFi/FM Chip 19. Keys are not working: Solution: Flash the handset with latest SW Check if the keys normally or not, Re-Solder Side key or change it Check the circuit from keys to CPU normally or not ,then Re-Solder CPU or change it...
- Page 20 D303 L3 Service Manual 20. Reset is not working: N/A 21. Vibrator is not working: Solution: Flash the handset with latest SW Check if the vibrator is failure then Re-Solder Vibrator or change it Check the CPU work normally or not. Re-Solder the CPU or change it...
- Page 21 D303 L3 Service Manual Vibration slot 22. Proximity sensor is not working Solution: Flash the handset with latest SW Check the Proximity sensor normally or not ,Re-Solder Proximity sensor or change it. Check the Power IC work normally or not, Re-Solder Power IC or change it ...
- Page 22 D303 L3 Service Manual Proximity Power IC sensor 23.GPS cannot locate and open: Solution: Check GPS 11 to 30 S if these are working fine。 Flash the handset with latest SW Check the GPS antenna normally or not, then Re-Solder or change it.
- Page 23 D303 L3 Service Manual GPS ANT 24.Network issue: Solution: Flash the handset with latest SW Check the RF Antenna Slot soldering quality, if not, Re-sold it or change it. Check the RF connector normally or not. Re-sold it or change it ...
- Page 24 D303 L3 Service Manual RF PA SIM card RF IC Crystal...
- Page 25 D303 L3 Service Manual Thanks...
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