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TEST POINT
CIRCUIT
Checking Flow
Voltage at
Pin5 of U702
Is 2.8V?
YES
YES
NO
NO
Regulator Circuit is OK
See next Page to check
VCTCXO
Level at
Pin3 of U702
Is high?
Replace U702
Change main board
VBAT
CLKON
C533
10u
IN
U702 MIC5255-85BM5
GNO
EN
OUT
BYP
1
2
3
4
C734
C534
RF2V85
5
10u
0.01u
(1608)
(1) Checking Regulator Circuit
4 . TROUBLE SHOOTING
Summary of Contents for B2050
Page 7: ... 6 2 PERFORMANCE 2 PERFORMANCE 2 1 H W Features ...
Page 8: ... 7 2 PERFORMANCE ...
Page 9: ... 8 2 PERFORMANCE 2 2 Technical Specification ...
Page 10: ... 9 2 PERFORMANCE ...
Page 11: ... 10 2 PERFORMANCE ...
Page 12: ... 11 2 PERFORMANCE ...
Page 13: ... 12 2 PERFORMANCE ...
Page 57: ... 56 3 Checking Ant SW Mobile SW 4 TROUBLE SHOOTING ...
Page 67: ... 66 TEST POINT 4 6 LCD Trouble 4 TROUBLE SHOOTING ...
Page 70: ... 69 4 TROUBLE SHOOTING TEST POINT 4 7 Speaker Trouble ...
Page 77: ... 76 4 TROUBLE SHOOTING 4 10 KEY backlight Trouble TEST POINT ...
Page 92: ...5 DOWNLOAD AND CALIBRATION 91 5 2 Calibration ...
Page 93: ... 92 5 DOWNLOAD AND CALIBRATION ...
Page 97: ......
Page 103: ... 102 Figure 8 1 B2050 BOTTOM SIDE PCB LAYOUT 8 PCB LAYOUT ...
Page 104: ... 103 8 PCB LAYOUT Figure 8 1 B2050 TOP SIDE PCB LAYOUT ...
Page 105: ......
Page 113: ...10 STAND ALONE TEST 112 ...
Page 117: ......
Page 119: ......
Page 132: ... 131 ...
Page 133: ... 132 ...