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Q392
1. Technical Specifications :
Particular
Key Matrix For Flashing
Chipset
Android Version
Processor Frequency
Network Mode
ROM
RAM
Internal memory
Expandable Memory
Factory mode code
Good Earpiece volume
Good Loudspeaker volume
Good Mic volume
Good Vibrator volume
2. CAUTIONS
I.
Flashing & Servicing must be undertaken by qualified personnel only.
II.
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.
IV.
Ensure all components, modules, screws, and insulators are correctly re-fitted after servicing
and alignment.
Remarks
N/A
MTK6580
Quad-core
Android L
1.3GHz
3G WIFI
8GB
2GB
5GB
32GB
*#87#
32 ohm
4 ohm
2200 ohm
32 ohm
L3 Service Manual
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Summary of Contents for Micromax Q392
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Page 1: Technical Specifications
Q392 L3 Service Manual 1. Technical Specifications : Particular Remarks Key Matrix For Flashing Chipset MTK6580 Quad-core Android Version Android L Processor Frequency 1.3GHz Network Mode 3G WIFI Internal memory Expandable Memory 32GB Factory mode code *#87# Good Earpiece volume... - Page 2 Ensure all cables and wires are repositioned correctly if Handset disassembled Electrostatic discharge can easily damage the sensitive components of electronic products. Therefore, Service Centre must adhere the precautions which mentioned above. 3. Q392 Level trouble shooting 1) Doesn’t Power On Solution: ...
- Page 3 Q392 L3 Service Manual 2) Restart / Hang When the Power Key is pressed, the display freezes in a certain interface, if yes, Upgrade the software version; There is no display when the Power Key is pressed, and the current stays within 100~120mA, if yes, The problem is caused by pseudo soldering or damage of the MCP (U501);carry out repair soldering or replacement of the...
- Page 4 Q392 L3 Service Manual Display problems such as black screen, white screen and blurred screen when the backlight is OK. Solution: Exchange the front shell to judge if the LCD itself is abnormal, if yes, Replace the LCD; Check if the LCD connector is damaged, if yes, Replace the LCD connector XJ801;...
- Page 5 Q392 L3 Service Manual 4) Touchpad Failure Solution: Exchange the front shell to judge if the TW itself is abnormal, if yes, Replace the front shell (with LCD); Check if the LCD/TP connector is damaged, if yes, Replace the main LCD/TP connector XJ801;...
- Page 6 Q392 L3 Service Manual 6) Accelerometer “Failure to realize automatic screen rotation during image viewing” Solution: Check if the voltages of C900（1.8V）and C901（2.8V）, respectively, if yes, Carry out repair soldering or replacement; Check if the IIC pull-up resistors R306 and R307 of the acceleration sensor have pseudo soldering, if yes, Carry out repair soldering or replacement;...
- Page 7 Q392 L3 Service Manual 7) Keypad There is no current when the Power Key is pressed, or volume keys do not work, please exchange the key FPC; Check if R401,R1324 andR1325 is soldered abnormally or damaged, if yes, Carry out repair soldering or replacement of them;...
- Page 8 Q392 L3 Service Manual There is charging indication, but no charging current. Solution: Check if there is any obvious damage on the surface of the charging IC U902, if yes, The charging IC is damaged; replace U902; Replace L407 and R328.
- Page 9 Q392 L3 Service Manual 12) Flash Light “Malfunction of Torch or Flashlight” Solution: Check if the camera can be turned on, if yes, The problem is caused by the rear-facing camera; see the analysis of camera failures; Check if the light can turn on when battery voltage is supplied to its both ends, if yes, Replace the light HL902;...
- Page 10 Q392 L3 Service Manual 14) Sim “Failure to identify SIM card” Solution: Check if the SIM card sockets J1301andJ1303 is obviously damaged, if yes, Replace the SIM card socket; Check if the pins of the SIM card sockets J1301andJ1303 have pseudo soldering, if yes, Carry out repair soldering;...
- Page 11 Q392 L3 Service Manual Abnormality of coupling power. Solution: Abnormality of coupling power often occurs in calibration and integrated test of the production line. Generally, this problem can be solved according to the following steps: First, test the conduction power to see if it’s normal; if normal, then test the circuit between the RF test socket and the antenna to see if it is normal;...
- Page 12 Q392 L3 Service Manual Sub board J102 on the schematic and related components on the PCB Abnormality of conduction power Solution: There are many causes of abnormality of conduction power. The basic causes include: ① Damage of component material in the RF circuit, which can be solved by replacing the material;...
- Page 13 Q392 L3 Service Manual 3G WCDMA B1&B8 TX&RX circuit on the schematic and related components on the PCB PS: To be sure, the WCDMA BAND8 TX and RX link are cross the BAND5 path in the schematic, which is just considering the compatibility design, not the wrong design.
- Page 14 Q392 L3 Service Manual BT/WIFI Circuit on the schematic and related components on the pcb 17) BT Failures---Please refer same with WIFI BT use the same circuit with WIFI, related failures please refer same with WIFI 18) GPS Failures---Please refer with WIFI Positioning failure of GPS, if yes:...
- Page 15 Q392 L3 Service Manual 19) FM Failures - Please refer with WIFI Positioning failure of FM, if yes: Check if theU101 is soldered incompletely or has pseudo soldering. Carry out repair soldering of the components or replace it by a new one.
- Page 16 Q392 L3 Service Manual Visually inspect the earphone jack to see if there is any abnormality, if yes, Replace the earphone jack J603; Check if Z601, Z602, Z603 and Z604 have pseudo soldering, if yes, Carry out repair soldering;...
- Page 17 Q392 L3 Service Manual There is no voice transmitted by the earphone MIC via WCDMA/GSM network. Solution: Visually inspect the earphone jack to see if it is abnormal, if yes, Replace the earphone jack J603; Check if Z603,FV601,C610,C608,C609and C612 have pseudo soldering, if yes, Carry out repair soldering;...
- Page 18 Q392 L3 Service Manual 23) Incoming Audio / Earpiece “There is no voice received from the receiver via WCDMA/GSM network” Solution: Exchange the front shell to judge if the receiver itself is abnormal, if yes, Replace the receiver; Check if the receiver pad to ground impedance is lower than grade K, if yes, Replace C626, C627, C628, FV605 and FV606 on the mainboard;...
- Page 19 Q392 L3 Service Manual 24) Speaker “There is no sound from the speaker when an audio file is played” Solution: Exchange the back shell to judge if the speaker itself is abnormal, if yes, Replace the speaker; Check if L604 and L605 have pseudo soldering or damage, if yes, Carry out repair soldering;...
- Page 20 Q392 L3 Service Manual 25) Memory Card “Failure to identify TF card” Solution: Check if the TF card socket J1304 is obviously damaged, if yes, Replace the TF card socket; Check if the ground impedance of each pin of the TF card socket (except the ground pin) is low (lower than grade K) , if yes, Replace the varistor of the corresponding pin;...