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Summary of Contents for Blu Dash JR
- Page 1 BLU Dash JR Service Manual...
- Page 2 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.
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Page 3: Gsm General Specification
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. - Page 4 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.
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Page 5: Product Function
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. - Page 6 03 C1...
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Page 7: Chart Of Troubleshooting
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 Change J801 or Re-welding it Check the USB connector is ok or not Check the power supply and the output of U100 Re-welding or change U100 Test C446 to check the 26M clk is ok or not Change 26M crystal X0401 or re-welding... - Page 8 4.During a call cannot hear each other’s voices No sound in REC Check the connection of receiver,damage or not Change Receiver Check All the individual components of Rec path Re-welding it Re-welding or change U100 No sound in MIC Check the connection of microphone,damage or not Change Mic Check All the individual components of MIC circuit Re-welding it...
- Page 9 6,RF abnormal RF abnormal 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？ Change or re-welding U407 Check whether the U401 and U405(U403) is normal Change or re-welding it Change or re-welding U400 7, WIFI/BT abnormal...
- Page 10 SW UpgradeDownload...
- Page 11 Calibration...
- Page 12 EAR jack MAINBOARD W IFI/BT ANT USB conn FM IC TP conn WIFI/BT shielding Charge MOS Micro SD/SIM CARD conn BATTERT CONN 3D G-sensor BBIC :SC6820 Flash/RAM RF PA 26M crystal 2D G-sensor RF transceiver MOTOR SPEAKER GSM ANT...
- Page 13 Receiver Camera conn LCD conn Microphone...
- Page 14 J801 WIFI/BT E1001 C1102 L1003 LIHI VDD18 01003 RST GND J702 r1o re SDA INT 01203 2V8 SCL SIDEKEY VBAT SIM2 SIM1 J803 RIOIO R1M11 R834 n Cfi35 Rfi 35 U102 0613 X0401 U407...
- Page 15 RCV602 RZ`V+ L-SENSOR 1 TX D- D+ J706 ® ® 1H0' CAMERA GNDVCHGVBAT 7631-MB-VO.2 KEY-FPC...
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