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4.11 Key Sense Trouble
Key Sense sequence of U300 is :
Default condition ROW(0-4) is 2.7V
→
Press the key
→
Corresponding row(x) and col(x)
go to 0V
→
Key sensing
Start
Work well?
Check the RA600,
R606 with no key press
Change the Main board
End
Yes
NO
Change the side key
pcb
Check the RA600,
R606 with key press
NO
ROW(0-4) is 2.7V?
Check RA600,R606
NO
YES
Side Key
For Camera
RA600
R606
Side Key
For Volume
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 ...