4. TROUBLE SHOOTING
- 39 -
(1) Checking Regulator Circuit
U503
U503. 5
(OUT)
U503. 3
(EN)
Regulator Circuit is OK
See next Page to check
VCTCXO
Voltage at
Pin5 of U503
Is 2.85V?
Level at
Pin3 of U503
Is high?
YES
NO
Replace U503
YES
NO
Change main board
4.7u
C547
4
BYP
EN
3
GND
2
1
IN
5
OUT
VBAT
MIC5255-2.85BM5
U503
0.01u
C546
R522
0
C545
1u
R523
100K
RF2V85
CLKON
TEST POINT
CIRCUIT
Checking Flow
Содержание KG225
Страница 1: ...Date April 2006 Issue 1 0 Service Manual Model KG225 Service Manual KG225 M O B ILE CAM E R A ...
Страница 3: ... 4 ...
Страница 19: ...3 TECHNICAL BRIEF 20 Figure 3 4 SYSTEM INTERCONECTION OF AD6720 EXTERNAL INTERFACE ...
Страница 66: ...4 TROUBLE SHOOTING 67 4 12 KEY backlight Trouble Q300 R359 TEST POINT Figure 21 ...
Страница 79: ... 80 5 DOWNLOAD B Multi Download Procedure 1 Run GSM Multi Download program and select Setting ...
Страница 82: ... 83 5 DOWNLOAD 7 Check if the ADI option is set to Hermes 8 Press OK to end Configuration Select Rate ...
Страница 84: ... 85 6 BLOCK DIAGRAM 6 BLOCK DIAGRAM ...
Страница 85: ... 86 ...
Страница 92: ... 93 KG225 8 PCB LAYOUT ...
Страница 93: ... 94 KG225 8 PCB LAYOUT ...
Страница 101: ... 102 10 STAND ALONE TEST Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 109: ... 110 ...
Страница 125: ...Note ...
Страница 126: ...Note ...