Table of Contents
1. Circuit diagram instruction .................................................................................... 3
1.1 Main board explored view .............................................................................. 3
1.2 Detailed Description of Circuit Chart ........................................................... 4
1.3 RF circuit ......................................................................................................... 4
1.4 Base band circuit ............................................................................................. 5
1.5 Function circuit ............................................................................................... 5
2．Fault maintenance .................................................................................................. 6
3．Trouble shooting and flow chart ........................................................................... 8
3.1 Unable to power on the handset .................................................................... 8
3.2 No ring tone ..................................................................................................... 9
3.3 LCD display fault .......................................................................................... 10
3.4 Charging fault ............................................................................................... 11
3.5 Camera fault .................................................................................................. 12
3.6 Fail to identify SIM card .............................................................................. 13
3.7 MIC fault ....................................................................................................... 14
3.8 Keypad fault .................................................................................................. 15
3.9 Receiver fault ................................................................................................. 16
3.10 Vibrate fault ................................................................................................. 17
3.11 FM fault........................................................................................................ 18
3.12 Bluetooth fault ............................................................................................. 19
3.14 No signal ....................................................................................................... 20
3.15 Failure to identify T-flash card .................................................................. 21
3.16 Earphone fault ............................................................................................. 22
3.17 Unable to use USB ....................................................................................... 23
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