- 48 -
Check Pin 3.
Refer to Graph 4-1 (b)
Check Pin 4.
Refer to Graph 4-1 (a)
No
Yes
2.7V OK?
No
Yes
Changing X500
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
Check U101, PMIC
Graph 4-1(a)
Graph 4-1(b)
TEST POINT
CIRCUIT
Checking Flow
Waveform
13 MHz O.K?
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
4 . TROUBLE SHOOTING
Содержание B2050
Страница 7: ... 6 2 PERFORMANCE 2 PERFORMANCE 2 1 H W Features ...
Страница 8: ... 7 2 PERFORMANCE ...
Страница 9: ... 8 2 PERFORMANCE 2 2 Technical Specification ...
Страница 10: ... 9 2 PERFORMANCE ...
Страница 11: ... 10 2 PERFORMANCE ...
Страница 12: ... 11 2 PERFORMANCE ...
Страница 13: ... 12 2 PERFORMANCE ...
Страница 53: ... 52 4 2 TX Trouble TEST POINT 13Mhz OSCILLATOR Mobile SW FEM TRANCEIVER LDO PAM 4 TROUBLE SHOOTING ...
Страница 57: ... 56 3 Checking Ant SW Mobile SW 4 TROUBLE SHOOTING ...
Страница 67: ... 66 TEST POINT 4 6 LCD Trouble 4 TROUBLE SHOOTING ...
Страница 70: ... 69 4 TROUBLE SHOOTING TEST POINT 4 7 Speaker Trouble ...
Страница 77: ... 76 4 TROUBLE SHOOTING 4 10 KEY backlight Trouble TEST POINT ...
Страница 91: ... 90 5 DOWNLOAD AND CALIBRATION 6 Press Start and Pover on the phone using JIG remote Power on Switch 1 ...
Страница 92: ...5 DOWNLOAD AND CALIBRATION 91 5 2 Calibration ...
Страница 93: ... 92 5 DOWNLOAD AND CALIBRATION ...
Страница 97: ......
Страница 103: ... 102 Figure 8 1 B2050 BOTTOM SIDE PCB LAYOUT 8 PCB LAYOUT ...
Страница 104: ... 103 8 PCB LAYOUT Figure 8 1 B2050 TOP SIDE PCB LAYOUT ...
Страница 105: ......
Страница 113: ...10 STAND ALONE TEST 112 ...
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Страница 133: ... 132 ...