Micromax Q346 Manuale utente

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

Rom

RAM

Internal SD Card memory

5.4GB for End user

Q346 L3 Service Manual

Expandable Memory

32G

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

I. Flashing & Servicing must be undertaken by qualified personnel only.

II. Ensure all work is carried out at an anti-static workstation USB (J609) n 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

V. Ensure all cables and wires are repointed correctly if Handset disassembled

VI. Electrostatic discharge can easily damage the sensitive components of electronic products.

Therefore, Service Centre must adhere the precaution which mentioned above.

Q346 L3 Service Manual

C) L3 Service Manual

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.

Solution：

1. Use a fresh data cable.

2. Check the USB (J609) connector and its soldering quality, and then check the volume of J607.

3. Re-Solder the USB (J609) connector.

4. Re-Solder the 26M(X901) crystal or change it.

5. Re-Solder the CPU (U0100) or change it.

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.

3. Re-Solder the 26M(X901) crystal or change it.

4. Re-Solder the CPU (U0100) or change it.

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).

4. Re-Solder the CPU (U0100) or change it.

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.

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.

2. Re-Solder the CPU (U0100) or change it.

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.

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