(2) Checking VCTCXO Circuit
4. TROUBLE SHOOTING
- 46 -
X500.3
(OUT)
X500.4
(VCC)
X500
Check Pin 3.
Refer to Graph 4(b)
26 MHzO.K?
No
No
VCTCXO Circuit is OK
See next Page to check
Mobile SW
VCTCXO Circuit is OK
See next Page to check
Mobile SW
Yes
Check Pin 4.
Refer to Graph 4(a)
2.75V OK?
No
Yes
Changing X500
Check U101
1000p
C543
100
R520
R521
15K
2V75_VVCXO
C542
NA
GND
2
OUT
3
4
VCC
1
VCONT
X500
26MHz
C544
2.2u
AFC
TEST POINT
CIRCUIT
Waveform
Checking Flow
Graph 4(a)
Graph 4(b)
Figure 7
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 ...