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A27
Micromax A27 User Manual
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20
3.14 No signal
Is RF antenna assembled correctly?
No RF signal
OK
Re-assemble BT anntena
No
Is the phone set into Flying
mode?
Yes
Yes
Return to Normal mode
No
Replace new mainboard
No
Check RF circuit for any fault
Yes
Mark the mainboard with
analysis result
19
21
Table of Contents
Default Chapter
2
Table of Contents
2
1 Circuit Diagram Instruction
3
Main Board Explored View
3
Detailed Description of Circuit Chart
4
RF Circuit
4
Base Band Circuit
5
Function Circuit
5
2 Fault Maintenance
6
3 Trouble Shooting and Flow Chart
8
Unable to Power on the Handset
8
No Ring Tone
9
LCD Display Fault
10
Charging Fault
11
Camera Fault
12
Fail to Identify SIM Card
13
MIC Fault
14
Keypad Fault
15
Receiver Fault
16
Vibrate Fault
17
FM Fault
18
Bluetooth Fault
19
No Signal
20
Failure to Identify T-Flash Card
21
Earphone Fault
22
Unable to Use USB
23
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Micromax A27 Specifications
General
Brand
Micromax
Model
A27
Category
Cell Phone
Language
English
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