CDMA U300 Technical Manual

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1 Introduction..........................................................................................................................................6
1.1 Reference..........................................................................................................................................6
2 Specification ........................................................................................................................................7
2.1 Product Packaging .............................................................................................................................7
2.1.1 Standard Package .................................................................................................................7
2.1.2 Optional Accessories .............................................................................................................7
2.2 Specifications ....................................................................................................................................7
2.3 Battery Specifications........................................................................................................................8
2.4 Travel Charger Specifications ............................................................................................................9
3 Technical Description........................................................................................................................10
3.1 Overview .........................................................................................................................................10
3.2 RF part Description ..........................................................................................................................22
3.2.1 Description of Frequency Synthesizer Circuit......................................................................22
3.2.2 Description of Rx Part Circuit...............................................................................................23
3.2.3 Description of Tx Part Circuit...............................................................................................24
3.3 Logic Part Description ......................................................................................................................27
3.3.1 MSM6500 MOBILE STATION MODEM (U100) ..................................................................27
3.3.2 R-UIM..................................................................................................................................29
3.3.3 Memory Part (U200) ............................................................................................................29
3.3.4 Charging SYSTEM ..............................................................................................................29
3.3.5 AUDIO LINE-UP ..................................................................................................................30
3.3.6 LCD DISPLAY .....................................................................................................................32
3.3.7 CAMERA.............................................................................................................................32
3.3.8 Bluetooth Part(U500) ...........................................................................................................34
4 Servicing Tools..................................................................................................................................35
4.1 U-300 Service tools ..........................................................................................................................35
4.2 Insertion Loss of Mobile S/W Cable .................................................................................................35
5 Measurement ....................................................................................................................................37
5.1 Measurement Configuration.............................................................................................................37
6 Assembling and Disassembling .........................................................................................................38
7 Replacing Parts.................................................................................................................................45
7.1 Build-up PCB(Printed Circuit Board) ................................................................................................45
7.2 Devices in Special Package .............................................................................................................45
7.3 Irreplaceable Devices.......................................................................................................................45
8 Trouble Shooting...............................................................................................................................46
8.1 Logic Part Trouble Shooting.............................................................................................................46
8.1.1 Trouble shooting 1 (No Power UP)......................................................................................47
8.1.2 Trouble shooting 2 (No LCD On).........................................................................................48
8.1.3 Trouble shooting 3 (No Backlight On) .................................................................................49
8.1.4 Trouble shooting 4 (No CMX Melody On) ...........................................................................50
8.1.5 Trouble shooting 5 (No Audio On).......................................................................................51
8.1.6 Trouble shooting 6 (No motor Vibration) .............................................................................52
8.1.7 Trouble shooting 7 (No UIM operation) ...............................................................................53
8.1.8 Trouble shooting 8 (No sound Stereo Earphone and SEND_END)....................................54
8.1.9 Trouble shooting 9 (No sound from Ear_Mic set)................................................................55
8.1.10 Trouble shooting 10 (No key input) ....................................................................................56
8.1.11 Trouble shooting 11 (No Battery Charging)........................................................................57
8.1.12 Trouble shooting 12 (No Camera Operation) .....................................................................58
8.1.13 Trouble shooting 13 (No Bluetooth Operation)...................................................................59
8.1.14 Trouble shooting 14 (No USB Operation) ..........................................................................60
8.2 RF Part Trouble Shooting.................................................................................................................61
8.2.1 H/W Control Mode ...............................................................................................................61
8.2.2 RF Power(PMIC) Circuit ......................................................................................................62
8.2.3 Receiver Circuit ...................................................................................................................63

8.2.4 Conductive Performance NG...............................................................................................64
8.2.5 RX Frequency NG ...............................................................................................................66
8.2.6 Transmitter Circuit ...............................................................................................................67
8.2.7 Modulation NG.....................................................................................................................69
8.3 Signal Level and DC Bias Voltage ...................................................................................................70
8.3.1 Transmitter Circuit ...............................................................................................................70
8.3.2 Synthesizer Circuit...............................................................................................................71
8.3.3 Receiver Circuit....................................................................................................................72
8.3.3 Main Power Chip(PM6650)..................................................................................................74
9 Appendixes........................................................................................................................................75
9.1 Service Tools on PC .........................................................................................................................75
9.2 Schematic........................................................................................................................................75
9.3 Layout..............................................................................................................................................76