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1. INTRODUCTION.................................. 5
1.1 Purpose ...................................................... 5
1.2 Regulatory Information ............................... 5
2. PERFORMANCE ..................................7
2.1 System Overview.........................................7
2.2 Usable environment.....................................8
2.3 Radio Performance......................................8
2.4 Current Consumption.................................14
2.5 RSSI BAR ..................................................14
2.6 Battery BAR ...............................................15
2.7 Sound Pressure Level ...............................16
2.8 Charging ....................................................16
3. TECHNICAL BRIEF............................17
3.1 General Description ...................................17
3.2 GSM Mode.................................................19
3.3 UMTS Mode...............................................23
3.4 LO generation and distribution circuits ......25
3.5 Off-chip RF Components ...........................25
3.6 Digital Baseband(DBB/MSM7200) ............35
3.7 Hardware Architecture ...............................37
3.8. Subsystem(MSM7200) .............................39
3.9. Power Block..............................................42
3.10. External memory interface......................47
3.11. H/W Sub System ....................................49
3.12. Main Features.........................................76
4. TROUBLE SHOOTING.......................82
4.1 RF Component ..........................................82
4.2 SIGNAL PATH_UMTS RF .........................85
4.3 SIGNAL PATH_GSM RF ...........................86
4.4 Checking VCTCXO Block ..........................87
4.5 Checking Front-End Module Block ............89
4.6 Checking UMTS Block...............................91
4.7 Checking GSM Block.................................96
4.8 Checking Bluetooth Block........................102
4.9 Checking WLAN Block.............................104
4.10 Power ON Troubleshooting ...................108
4.11 Charger Troubleshooting .......................110
4.12 USB Troubleshooting.............................113
4.13 SIM Detect Troubleshooting ..................115
4.14 Camera Troubleshooting .......................117
4.15 Keypad Backlight Troubleshooting ........120
4.16 Main LCD Troubleshooting ....................121
4.17 Receiver Path ........................................122
4.18 Headset path .........................................124
4.19 Speaker phone path ..............................126
4.20 Main microphone ...................................128
4.21 Headset microphone..............................130
4.22 Vibrator ..................................................132
5. DOWNLOAD.....................................133
5.1 KS20 DOWNLOAD..................................133
6. BLOCK DIAGRAM ...........................146
6.1 GSM & UMTS RF Block ..........................146
6.2 Interface Diagram ....................................148
7. Circuit Diagram................................153
8. BGA IC PIN MAP..............................163
8. PCB LAYOUT ...................................169
9. Calibration & RF Auto Test
Program (Hot Kimchi) .....................177
9.1 Configuration of HOT KIMCHI .................177
9.2 How to use HOT KIMCHI.........................180
10. Phone Test Mode _ 3G smart
Phone KS20 ...................................182
11. EXPLODED VIEW & REPLACEMENT
PART LIST ..................................... 189
11.1 EXPLODED VIEW ................................ 189
11.2 Replacement Parts
<Mechanic component> ....................... 191
<Main component> ............................... 193
11.3 Accessory ............................................. 209
Table Of Contents
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