Micromax A94 User manual

A94 service manual

content
• 1、 Product introduce..………..p3-p4
• 2、 Disassembly guide ……….p5-p17
• 3、Structure parts diagram…..p18
• 4、 Repairing guide …………...p19-p29

Product introduce

Product introduce
• Model ：A94
• Product size：137*66.6*9.6mm
• Platform：BCM23550，quad-core 1.2GHz
• Memory： 4GB+4Gb (e-MMC&LPDDR2）
• System：Android 4.2
• Frequency band: WCDMA：2100，GSM：900/1800MHz
• Battery： 1800mAh
• charger: Travel charger
• USB cable: MICRO 5PIN
• earphone： 3.5 jack
• LCD&TP： 4.5 FWVGA, Capacitance TP， multi-point touch
• Camera：5.0M front and 5.0M rear CMOS
• Support：BT2.1，WIFI，FM，NTC。
• Support：3D graphics accelerator，accelerator sensor, distance
sensor, light feeling sensor。

Disassembly guide
• 1. Tools list
Tweezer /Cross screw driver/Solder/Tommy bar/hot gun

Disassembly guide
• 2. Battery caver disassembly
• open the battery cover，as the Fig. 1
Fig. 1
Battery cover

Disassembly guide
• 3. Back caver disassembly
• 1） Unscrew 11 screws in back cover ，as the Fig.2；
Fig. 2

Disassembly guide
• 2） Disassemble back cover with Tommy bar ，as the Fig.3；
Fig.3
Back cover SPK

Disassembly guide
• 4.Main board and front cover disassembly
• 1）The main components of distribution，as the Fig.4；
Fig.4
Main PCB
Earphone con
TP con
8M camera
USB con
5M camera
LCD con
SIM2 card con
SIM1 card con
T card con
BAT con
RF cable
vibrator
MIC
ANT clip

Disassembly guide
• 2）remove 1 screws and open the LCD con.& TP con. ，and
remove the volume key FPC & power key FPC as the Fig.5；
Fig.5
LCD con
TP con

Disassembly guide
• 3）open the main board and remove the RF cable con. And main
FPC con..as the Fig.6
Fig.6
RF part AP part
accelerator sensor
Main FPC con

Disassembly guide
• 5. 5M front and 5M rear camera & light sensor
disassembly
remove the light sensor and 5M front camera，as the Fig.7；
Fig.7
5M rear camera
5M front camera
light & distance sensor

Disassembly guide
• 6.Power key FPC & volume key FPC disassembly
remove the power key FPC and volume key FPC with the iron，as
the Fig.8；
Fig.8
Volume key FPC Power key FPC

Disassembly guide
• 7. Speaker & receiver disassembly
remove the Speaker camera and receiver，as the Fig.9；
Fig.9
Speaker
Receiver

Disassembly guide
• 8. RF cable and Main FPC disassembly
Remove the RF cable and Main FPC ，as the Fig.10
Fig.10

Disassembly guide
• 9. Sub PCBA disassembly
remove the sub PCBA from the ，as the Fig.11；
Fig.11

Disassembly guide
• 10.MIC disassembly
Remove the MIC，as the Fig.12；
Fig.12

Structure parts diagram

Repairing guide
1. LCD
a. Check if the SW is correct, otherwise to upgrade the SW;
b. Check the LCD if is ok, otherwise change a new LCD;
c. If that the LCD loose, re-assemble the LCD and test;
d. Checking the LCD connector if is ok, otherwise re-solder it or change
a new one;
e. Checking the circuit around the LCD connector.

Repairing guide
2. Camera
a. Checking the camera is assemble ok, re-assemble the camera and
test;
b. Using the good camera to do cross test, it can check if the camera is
ok;
c. Checking the camera connector if is ok as below picture, otherwise
to re-solder or change a new one;
d. Checking the circuit around the camera connector.