4. TROUBLE SHOOTING
- 55 -
(2) Checking VCTCXO Circuit
X500.3
X500.4
X500
Figure 4-3
Test Points
Checking Flow
Circuit Diagram
Waveform
Check Pin 3.
Refer to Graph 4-1(b)
26 MHz OK?
No
No
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
Yes
Check Pin 4.
Refer to Graph 4-1(a)
2.7V OK?
No
Yes
Change X500
Check U101, PMIC
0.1u
C531
10K
R511
C533
2.2u
R510
100
100p
C530
GND
2
OUT
3
4
VCC
VCONT
1
X500
26MHz
2V75_VVCXO
AFC
Graph 4-1(a)
Graph 4-1(b)
Содержание C3380
Страница 1: ...Service Manual Model C3380 Date November 2005 Issue 1 0 Service Manual C3380 ...
Страница 3: ... 4 ...
Страница 83: ...4 TROUBLE SHOOTING 84 4 11 KEY backlight Trouble Test Points Figure 4 22 ...
Страница 98: ...4 TROUBLE SHOOTING 99 Yes No Yes No Replace M201 Establish a call Replace U101 Software Re_download ...
Страница 109: ...Note 110 ...
Страница 116: ... 117 8 PCB LAYOUT ...
Страница 117: ... 118 8 PCB LAYOUT ...
Страница 125: ...10 STAND ALONE TEST 126 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 129: ... 130 ...
Страница 131: ... 132 ...