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4.9. USB Trouble
USB Initial sequence of U300 is :
USB connected to U300
→
USB_VBUS(U403 Pin_4) go to 5V
→
USB_D+(U403 Pin_1) go to 3.3V
→
48M Crystal on
→
USB work.
Start
USB_VBUS is about
to 5V?
USB_D+ is about to 3.3V?
48M is run?
Change the Main board
Check U403,USB cable
Check U403
Check X200
NO
YES
YES
YES
NO
NO
Cable is insert?
YES
Cable insert
NO
X200(48MHz)
USB_VBUS
USB_D+
(U403 1pin)
USB_D-
(U403 6pin)
Z3X-BOX.COM
Summary of Contents for U300
Page 3: ... 4 Z 3 X B O X C O M ...
Page 24: ...3 TECHNICAL BRIEF 25 Figure 3 3 1 1 RFR6250 IC functional block diagram Z 3 X B O X C O M ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram Z 3 X B O X C O M ...
Page 76: ...4 TROUBLE SHOOTING 77 4 5 Checking WCDMA Block Z 3 X B O X C O M ...
Page 77: ...4 TROUBLE SHOOTING 78 4 3 5 1 2 Z 3 X B O X C O M ...
Page 82: ...4 TROUBLE SHOOTING 83 4 5 5 Check RF Rx Level Test Point RF Rx Level Z 3 X B O X C O M ...
Page 85: ...4 6 Checking GSM Block 4 TROUBLE SHOOTING 86 Z 3 X B O X C O M ...
Page 87: ...4 TROUBLE SHOOTING 88 Z 3 X B O X C O M ...
Page 89: ...4 TROUBLE SHOOTING 90 Z 3 X B O X C O M ...
Page 92: ...4 TROUBLE SHOOTING 93 Z 3 X B O X C O M ...
Page 95: ...4 TROUBLE SHOOTING 96 Z 3 X B O X C O M ...
Page 110: ...4 TROUBLE SHOOTING 111 C515 C516 CN501 Z 3 X B O X C O M ...
Page 116: ...4 TROUBLE SHOOTING 117 C201 C202 for MIC capacitor Z 3 X B O X C O M ...
Page 119: ...4 TROUBLE SHOOTING 120 Q400 Q401 Q402 VBATT GND Z 3 X B O X C O M ...
Page 140: ...6 BLOCK DIAGRAM 141 Z 3 X B O X C O M ...
Page 141: ...6 2 Interface Diagram U300 Interface Diagram 6 BLOCK DIAGRAM 142 Z 3 X B O X C O M ...
Page 149: ... 150 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 150: ... 151 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 151: ... 152 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 152: ... 153 8 PCB LAYOUT Z 3 X B O X C O M ...
Page 153: ... 154 Z 3 X B O X C O M ...
Page 156: ...9 Calibration 157 Check testing object Click Start for Calibration Z 3 X B O X C O M ...
Page 157: ...9 Calibration 158 Show result of calibration Show result Z 3 X B O X C O M ...
Page 159: ... 160 Z 3 X B O X C O M ...
Page 183: ...Note Z 3 X B O X C O M ...
Page 184: ...Note Z 3 X B O X C O M ...