Blu Dash JR Manuale utente

BLU Dash JR

Service Manual

ATTENTION

Boards, which contain Electrostatic Sensitive Device (ESD), art indicated.

Following information is ESD handling:

-Service personnel should ground themselves by using a wrist strap

when exchange system boards.

-When repairs are made to a system board, they should spread the floor with anti-static

mat which is also grounded.

-Use a suitable, grounded soldering iron.

-Keep sensitive parts in these protective packages until these are used.

-When returning system boards or parts like EEPROM to the factory, use the protective

packages as description.

Specification

GSM General Specification

Safety Precautions

Repair Precaution

Repair in Shield Box, during detailed tuning.

Take specially care of tuning or test,

because specificity of cellular phone is sensitive for surrounding

interference(RF noise).

Be careful to use a kind of magnetic object or tool,

because performance of parts is damaged by the influence of magnetic

force. Surely use a standard screwdriver when you disassemble this

product, otherwise screw will be worn away.

Use a thicken twisted wire when you measure level.

A thicken twisted wire has low resistance, therefore error of measurement

is few.

Repair after separate Test Pack and Set because for short danger (for

example an over current and furious flames of parts etc) when you repair

board in condition of connecting Test Pack and tuning on.

Take specially care of soldering, because Land of PCB is small and weak

in heat.

Surely tune on/off while using AC power plug, because a repair of battery

charger is dangerous when tuning ON/OFF PBA and Connector after

disassembing charger.

Don't use as you pleases after change other material than replacement

registered on SEC System.

Otherwise engineer in charge isn't charged with problem that you don't

keep this rules.

ESD (Electro statically Sensitive Devices)

Precaution

Several semiconductor may be damaged easily by

static electricity.

Such parts are called by

ESD(Electrostatically Sensitive Devices),

for example IC,BGA chip etc. Read

Precaution below. You can prevent from ESD damage

by static electricity.

Remove static electricity remained your body

before you touch semiconductor or parts with

semiconductor. There are ways that you touch an

earthed place or wear static electricity prevention string on

wrist.

Use earthed soldering steel when you connect or

disconnect ESD.

Use soldering removing tool to break static

electricity. Otherwise ESD will be damaged by static

electricity.

Don't unpack until you set up ESD on product.

Because most of ESD are packed by box and aluminum

plate to have conductive power, they are prevented from

static electricity.

You must maintain electric contact between ESD

and place due to be set up until ESD is connected

completely to the proper place or a circuit board.

Product Function

Camera and camcorder

Music player

WIFI

Dual Sim Card

03 C1

Chart of Troubleshooting

1,Cannot download

Connot download

Check the connection among Download Cable and PC.change another one check wherher it is ok or not

Check the USB connector is ok or not

Check the power supply and the output of U100

Test C446 to check the 26M clk is ok or not

Test the output of 32.768 crystal

Check the wilding between U100 andU500

2,No ring

Setting rightly and check spk

Check All the individual components of SPK path

Re-welding or change U100

3. No Vibration

Setting rightly and check MOT

Check the voltage of MOT- is close to 0.7V

Re-welding or change U100

Change J801 or Re-welding it

Re-welding or change U100

Change 26M crystal X0401 or re-welding

U400 Change 32.768K crystal X200

Re-welding or change it

Re-welding it

4.During a call cannot hear each other’s voices

No sound in REC

` N

Check the connection of receiver,damage or not Change Receiver

Y N

Check All the individual components of Rec path Re-welding it

Re-welding or change U100

No sound in MIC

` N

Check the connection of microphone,damage or not Change Mic

Y N

Check All the individual components of MIC circuit Re-welding it

Re-welding or change U100

5, Cannot power-on

Cannot power on

Check if it can be power on after redownloading

Check the power supply and the output of U100 Change U100 or Re-welding it

Test C446 to check the 26M clk is ok or not N Change 26M crystal X0401 or re-welding U400

Y N

Test the output of 32.768 crystal Change 32.768K crystal X200

Check the wilding between U100 andU500 Re-welding or change it,then redownloading

6,RF abnormal

RF abnormal

` N

Check whether the antenna have good contact Re-assembly of the antenna

Check All the individual components of RF circuit Re-welding it

Check whether the RF PA U407 is normal？N Change or re-welding U407

Y N

Check whether the U401 and U405(U403) is normal Change or re-welding it

Change or re-welding U400

7, WIFI/BT abnormal

Wifi/bt abnormal

` N

Check All the individual components of wifi/bt circuit Re-welding it

Y N

Re-welding or change U1003,then check wifi/bt is normal change U100 or re-welding it

8, ATV/FM abnormal

ATV/FM abnormal

` N

Check whether the ATV-ANT has good contact Re-assembly it

Take off camera moudle then check ATV again change camera moudle or re-welding it or re-download software

Y N

Check All the individual components of ATV circuit Re-welding it

Rewelding or change U1301

SW UpgradeDownload

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