4. TROUBLE SHOOTING
- 45 -
(1) Checking Regulator Circuit
U503. 5
(OUT)
U503. 3
(EN)
U503
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
Figure 6
Summary of Contents for KG225
Page 1: ...Date April 2006 Issue 1 0 Service Manual Model KG225 Service Manual KG225 M O B ILE CAM E R A ...
Page 3: ... 4 ...
Page 19: ...3 TECHNICAL BRIEF 20 Figure 3 4 SYSTEM INTERCONECTION OF AD6720 EXTERNAL INTERFACE ...
Page 66: ...4 TROUBLE SHOOTING 67 4 12 KEY backlight Trouble Q300 R359 TEST POINT Figure 21 ...
Page 79: ... 80 5 DOWNLOAD B Multi Download Procedure 1 Run GSM Multi Download program and select Setting ...
Page 84: ... 85 6 BLOCK DIAGRAM 6 BLOCK DIAGRAM ...
Page 85: ... 86 ...
Page 92: ... 93 KG225 8 PCB LAYOUT ...
Page 93: ... 94 KG225 8 PCB LAYOUT ...
Page 101: ... 102 10 STAND ALONE TEST Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 109: ... 110 ...
Page 125: ...Note ...
Page 126: ...Note ...