Micromax Q301 User manual

Q301 L2 Service Manual

Q301 L2 Service Manual
1：Technical Specifications
Particular
Remarks
Chipset
SC7731C
Android Version
N/A
Frequency
GSM 850/900/1800/1900 WCDMA900/2100
Rom
4GB
RAM
512MB
Factory mode code
*#629#

Q301 L2 Service Manual

Q301 L2 Service Manual
2、service Details
1. Does not power on
S.NO
Possible Cause
Validation steps
Action
1
Shorting
Check shorting with Multi meter
Replace PCB if found
faulty
2
Battery
Check voltage with Multi meter Value must
be 3.7V DC or above
Replace if found faulty
3
Battery
Connector
Check battery connector
Re-solder/Replace if
found faulty
4
SW failure
Flashing with latest software
Flashing
5
Power on Key
Key failure
Re-solder/Replace if
found faulty
6
PCB
Suspected PCB faulty
Refer L3 repair

Q301 L2 Service Manual
2：Display issue/No display
S.NO
Possible Cause
Validation steps
Action
1
No display
SWissue
Flash the handset with latest SW
LCD issue
Re-assembly LCD/Replace it
PCBA issue
Re-assembly PCBA/Replace it
PCBA issue
Re-Solder the LCD connector or change it
2
Dark screen
LCD issue
Re-assembly LCD/Replace it
SWissue
Flash the handset with latest SW

Q301 L2 Service Manual
3：Touch panel
S.NO
Possible Cause
Validation steps
Action
1
TP not working
SW Issue
Flash the handset with latest SW
TP issue
Re-assembly TP/Replace it
PCBA issue
Refer to L3 repair
PCBA issue
Re-Solder the TP connector or change it
2
TP not working proper
TP issue
Re-assembly TP/Replace it
PCBA issue
Refer to L3 repair
4：Keys
S.NO
Possible Cause
Validation steps
Action
1
Key is not response
Key is fail
Change Key
SW Issue
Flash the handset with latest SW
2
The feeling of pressing
key is bad
Key soldering Quality
Solder Key again
Some dust with dome
Clean it
Key is not assembled well
Re-assemble

Q301 L2 Service Manual
5：Charging
S.NO
Possible Cause
Validation steps
Action
1
Cannot charge into
Adapter is fail
Change adapter
Cable is fail
Change Cable
Battery is issue
Charging or Change it
Main FPC issue
Re-assembly or Change it
I/O connector is fail
Re-Solder or Change it
2
Have charging icon, but
not charged
SW Issue
Flash the handset with latest SW
PCBA fail
Change PCBA
Battery fail
Change battery
Battery connector issue
Change battery connector

Q301 L2 Service Manual
6：USB
S.NO
Possible Cause
Validation steps
Action
1
Cannot connect to PC
USB cable is fail
Change USB cable
I/O connector fail
Re-Solder or Change it
Main FPC issue
Re-assembly or Change it
PCBA fail
Change PCBA

Q301 L2 Service Manual
7：Camera
S.NO
Possible Cause
Validation steps
Action
1
Colored screen when
open front camera
Camera is fail
Re-assembly or Change it
PCBA fail
Change PCBA
2
Cannot turn on Rear
camera
SW issue
Flash the handset with latest SW
Camera fail
Re-assembly or Change it
Camera issue
Re-Solder or Change Camera connector
PCBA fail
Change PCBA

Q301 L2 Service Manual
8：Playing Video
S.NO
Possible Cause
Validation steps
Action
1
Hang often
SW issue
Flash the handset with latest SW
Flash poor soldering
Refer L3 Repair
CPU poor soldering
Refer L3 Repair
9：Vibrator
S.NO
Possible Cause
Validation steps
Action
1
Vibrating is not properly
Vibrate assemble issue
Re assemble it
SW issue
Flash the handset with latest SW
2
NO vibrate
Soldering issue
Re soldering it
PCBA issue
Refer to L3 service
3
Vibrate weakly
Vibrate issue
Change it

Q301 L2 Service Manual
10：RF Network
S.NO
Possible Cause
Validation steps
Action
1
RF Network cannot
searchable
SW issue
Flash the handset with latest SW
RF antenna issue
Re-assemble or Change it
SIM socket is fail
Re-Solder or Change it
Some dust with RF Slot
Clean it
RF Coaxial line issue
Re-assemble or Change it
RF connector issue
Re-Solder or Change it
PCBA fail
Change PCBA
11：FM
S.NO
Possible Cause
Validation steps
Action
1
Cannot turn on FM
SW issue
Flash the handset with latest SW

Q301 L2 Service Manual
Earphone is fail
Change Earphone
FM antenna fail
Re- Solder or Change earphone connector
PCBA fail
Change PCBA

Q301 L2 Service Manual
12: Receiver
S.NO
Possible Cause
Validation steps
Action
1
Noise/crack
Dust with receiver
Clean it
Receiver issue
Re-assemble or Change it
2
Noise/volume low
SW issue
Flash the handset with latest SW
Receiver is set too low by
person
Reset the value of volume
PCBA issue
Re-assemble or Change it

Q301 L2 Service Manual
13：Earphone
S.NO
Possible Cause
Validation steps
Action
1
Not working / from
earphone
SW issue
Flash the handset with latest SW
Earphone is fail
Change Earphone
PCBA issue
Refer to L3 service
Earphone connector
having poor soldering
Re-Solder or Change it

Q301 L2 Service Manual
14：MIC
S.NO
Possible Cause
Validation steps
Action
1
Noise with uplink side
Some dust with MIC
Clean it
MIC issue
Re-assemble
MIC issue
Re- Solder
PCBA issue
Refer to L3 repair
2
Volume low
soldering issue
Re-Solder or Change it
Volume is set too low by person
Reset the value of volume
PCBA issue
Refer to L3 repair
3
No recording
MIC issue
Re-Solder or Change it
SW issue
Flash the handset with latest SW
PCBA issue
Refer to L3 repair

Q301 L2 Service Manual
15: Speaker
S.NO
Possible Cause
Validation steps
Action
1
Noise/crack
Speaker with dust
Clean speaker
Speaker foam issue
Re-assemble or Change SPK
Speaker issue
Change speaker
2
No volume
Assemble issue
Assemble again
SW issue
Flash the handset with latest SW
Speaker issue
Re-assemble
Speaker issue
Re-Solder
3
Low volume
Assemble issue
Assemble again
Volume is set too low by
person
Reset the value of volume
Speaker issue
Change it
Audio PA issue
Refer to L3 repair

Q301 L2 Service Manual
16：Battery
S.NO
Possible Cause
Validation steps
Action
1
Show charging but it
is not charged
Battery issue
Change battery
Charging connector issue
Re-Solder or Change it
2
No charging
PCBA issue
Re-assemble or Change PCBA
PCBA issue
Refer to L3 repair
3
Can not charge fully
PCBA issue
Change PCBA
battery connector issue
Change battery connector

Q301 L2 Service Manual
17：WiFi/BT/GPS
S.NO
Possible Cause
Validation steps
Action
1
WI-FI not working
Set wifi turn off as default
Reset wifi to turn on wifi
SW issue
Flash the handset with latest SW
WiFi/BT antenna
Re-assembly WiFi/BT antenna or
change it.
PCBA issue
Change PCBA
S.NO
Possible Cause
Validation steps
Action
2
GPS not connecting
SW issue
Flash the handset with latest SW
Set GPS turn off as default
Reset GPS to turn on GPS
GPS antenna issue
Re-assemble or Change GPS antenna
PCBA issue
Refer to L3 service
Thanks
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