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4 . TROUBLE SHOOTING
TEST POINT
CIRCUIT
Checking Flow
Level at
Pin3 of U702
Is high?
Change main board
NO
NO
YES
YES
Voltage at
Pin5 of U702
Is 2.8V?
Regulator Circuit is OK
See next Page to check
VCTCXO
Replace U702
VBAT
CLKON
C533
10u
IN
U702 MIC5255-85BM5
GNO
EN
OUT
BYP
1
2
3
4
C734
C534
RF2V85
5
10u
0.01u
(1608)
Figure 4-2
(1) Checking Regulator Circuit
Содержание B2070
Страница 54: ... 53 4 TROUBLE SHOOTING 4 2 TX Trouble TEST POINT 13Mhz OSCILLATOR Mobile SW FEM TRANCEIVER LDO PAM ...
Страница 68: ... 67 4 TROUBLE SHOOTING TEST POINT 4 6 LCD Trouble ...
Страница 72: ... 71 4 TROUBLE SHOOTING TEST POINT 4 8 Speaker Trouble ...
Страница 79: ... 78 4 TROUBLE SHOOTING 4 11 KEY backlight Trouble TEST POINT ...
Страница 96: ...6 Press Start and Pover on the phone using JIG remote Power on Switch 1 5 DOWNLOAD AND CALIBRATION 95 ...
Страница 107: ... 106 8 PCB LAYOUT Figure 8 1 B2070 BOTTOM SIDE PCB LAYOUT ...
Страница 108: ... 107 8 PCB LAYOUT Figure 8 1 B2070 TOP SIDE PCB LAYOUT ...
Страница 109: ... 108 ...
Страница 117: ...10 STAND ALONE TEST 116 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 121: ... 120 ...
Страница 123: ... 122 ...