- 55 -
4 . TROUBLE SHOOTING
Graph 4-1(a)
Graph 4-1(b)
Check Pin 3.
Refer to Graph 4-1 (b)
Check Pin 4.
Refer to Graph 4-1 (a)
Yes
No
No
2.7V OK?
Yes
Changing X500
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
Check U101, PMIC
TEST POINT
CIRCUIT
13 MHz O.K?
Checking Flow
Waveform
AFC
X500
2V75_VVCXO
13MHz
C536
22u
VCC
GNO
OUT VCONT
100
R514
1
2
3
1
4
C538
1000p
15K
R516
(2) Checking VCTCXO Circuit
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 ...