Micromax Q346 Service Manual Download Page 14 | Manualshive

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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

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Summary of Contents for Q346

Page 1: ...fication 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 8G RAM 1G Int...

Page 2: ...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 a...

Page 3: ...Q346 L3 Service Manual C L3 Service Manual...

Page 4: ...Q346 L3 Service Manual...

Page 5: ...e 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 conn...

Page 6: ...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 X90...

Page 7: ...lder 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...

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: ...king 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 chan...

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: ...er 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 1 Assembly the speaker or change it...

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: ...100 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 2 Check soldering quality of the SIM connector 3 Check the SIM diagram...

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...

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