User ManualTable of Contents1. INTRODUCTION51.1 Purpose51.2 Regulatory Information52. PERFORMANCE72.1 System Overview72.2 Usable environment82.3 Radio Performance82.4 Current Consumption142.5 RSSI BAR142.6 Battery BAR152.7 Sound Pressure Level162.8 Charging163. TECHNICAL BRIEF173.1 General Description173.2 GSM Mode193.3 UMTS Mode233.5 Off-chip RF Components253.6 Digital Baseband(DBB/MSM6245)343.7 Block Diagram(MSM6245)363.8 Subsystem(MSM6245)373.9 Power Block453.10 External memory interface503.11 H/W Sub System523.12 Main Features684. TROUBLE SHOOTING734.1 RF Component734.2 SIGNAL PATH_UMTS RF754.3 SIGNAL PATH_GSM RF764.4 Checking VC-TCXO Block774.5 Checking Front-End Module Block794.6 Checking UMTS Block814.7 Checking GSM Block864.8 Checking Bluetooth Block924.9 Power ON Troubleshooting944.10 Charger Troubleshooting964.11 USB Troubleshooting994.12 SIM Detect Troubleshooting1004.13 Camera Troubleshooting1024.15 Main LCD Troubleshooting1064.16 Receiver Path1074.17 Headset path1094.18 Speaker phone path1114.19 Main microphone1134.20 Headset microphone1154.21 Vibrator1175. DOWNLOAD1195.1 U250/KU250 DOWNLOAD1195.1.1 Introduction1195.1.2 Downloading Procedure1195.1.4 Caution1336. BLOCK DIAGRAM1346.1 GSM & UMTS RF Block1346.2 Interface Diagram1367. Circuit Diagram1438. pcb layout147Program (Hot Kimchi)1499.1 Configuration of HOT KIMCHI1499.2 How to use HOT KIMCHI15210. Factory Test Mode15410.1. Test Program Setting15410.2. WCDMA Test Mode15510.3. GSM Test Mode156REPLACEMENT PART LIST15711.1 EXPLODED VIEW157<Mechanic component>159<Main component>16111.3 Accessory174Size: 5.46 MBPages: 175Language: EnglishOpen manual