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Q346
A) Technical Specification USB(J609)ns:
Particular
Key Matrix For Flashing
Chipset
Android Ver USB(J609)n
Frequency
Network Mode
Rom
RAM
Internal SD Card memory
Remarks
Volume+
SC7731
Android 5.1
1.3G
GSM：900/1800MHz WCDMA：900/2100MHz
8G
1G
5.4GB for End user
L3 Service Manual
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Summary of Contents for Micromax Q346
- Page 1 Q346 L3 Service Manual A) Technical Specification USB(J609)ns: Particular Remarks Key Matrix For Flashing Volume+ Chipset SC7731 Android Ver USB(J609)n Android 5.1 Frequency 1.3G Network Mode GSM：900/1800MHz WCDMA：900/2100MHz Internal SD Card memory 5.4GB for End user...
- Page 2 Q346 L3 Service Manual Expandable Memory Factory mode code *#1923*# Good Earpiece volume 32ohm Good Loudspeaker volume 8ohm Good MIC volume 2kohm Good Vibrator volume 40ohm Engineering Code *#*#83781#*#* B) CAUTUSB(J609)NS Flashing & Servicing must be undertaken by qualified personnel only.
- Page 3 Q346 L3 Service Manual C) L3 Service Manual...
- Page 4 Q346 L3 Service Manual...
- Page 5 Q346 L3 Service Manual D) Symptoms Please Provide PCBA Level repair process for below symptoms level with PCBA component images and Schematic diagrams 1、Unable to load Software: It might be the poor soldering of USB (J609) Connector, please check the soldering quality of USB (J609) Connector first, and then check the related diagram.
- Page 6 Q346 L3 Service Manual 2、No power on Solution： 1. Check resistor R619 from net PWRKEY to net PBINT is correct or not. 2. Power on the handset with DC to verify its current is correct or not, check the diagram of VBAT &VBUS is shorted or damaged.
- Page 7 Q346 L3 Service Manual 3、Not charging: Solution： 1. Use a fresh USB data cable or charger, re-solder the USB (J609) connector. 2. Check charge mosfet (Q501) is poor soldering, shorted or damaged. 3. Check Mid PIN of battery connector is poor soldering or not, check the related component is shorted, broken or not side key might be broken, (Q501 might be broken).
- Page 8 Q346 L3 Service Manual 4、LCD / Display problem: Solution： 1. Re-Solder the LCD or change it. 2. Re-Solder the CPU (U0100) or change it.
- Page 9 Q346 L3 Service Manual 5、VIBRATOR is not working Solution： 1. Assembly the vibrator or change it. 2. Check the vibrator circuit soldering quality. 3. Re-Solder the CPU (U0100) or change it. 6、Camera is not working Solution： 1. Re-Solder the camera or change it.
- Page 10 Q346 L3 Service Manual 7、MIC no sound: Solution： 1. Assembly the micphone or change it. 2. Check the micphone circuit soldering quality 3. Re-Solder the CPU (U0100) or change it.
- Page 11 Q346 L3 Service Manual 8、Receiver not working: Solution： 1. Assembly the receiver or change it. 2. Check the receiver circuit verify it is shorted with grounding or not. 3. Check R714/R715/C712/C713/RV707/RV708 4. Re-Solder the CPU (U0100) or change it. 9、Speaker not working: Solution：...
- Page 12 Q346 L3 Service Manual 10、FM not working: Solution： 1. Check phone jack (J701). 2. Check the FM circuit (built-in) soldering quality. 3. Re-Solder the CPU (U0100) or change it. 11、BT is not working fine:...
- Page 13 Q346 L3 Service Manual Solution： 1. Check BT antenna connection. 2. Check the BT circuit soldering quality. 3. Re-Solder the CPU (U0100) or change it. 12、Can ’ t detect the SIM card: Solution： 1. Check the connection of SIM card or change a fresh SIM card to verify it.
- Page 14 Q346 L3 Service Manual 13、RF module: Solution： 1. Flash the SW. 2. Check the GSM antenna connection. 3. If there was no signal, then re-solder or change the RF PA. 4. Re-solder the CPU (U0100) or change it...
- Page 15 Q346 L3 Service Manual Thanks For any Query or suggestion, Please write to tech.help@micromaxinfo.com...