4. TROUBLE SHOOTING
- 58 -
(2) Checking VCTCXO Circuit
X500. 4
X500. 3
Check Pin 3.
Refer to Graph 4-4(b)
26 MHzO.K?
No
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
VCTCXO Circuit is OK
See next Page to check
ANT SW & Mobile SW
Yes
Check Pin 4.
Refer to Graph 4-4(a)
2.75V OK?
No
Yes
Check U101, PMIC
Changing X500
10K
R515
2V75_VVCXO
100p
C528
2
GND
3
OUT
VCC
4
1
VCONT
26MHz
X500
2.2u
C539
C540
0.1u
100
R510
AFC
Test Points
Circuit Diagram
Waveform
Checking Flow
Figure 4-9
Graph 4-4(a)
Graph 4-4(b)
Summary of Contents for C2100
Page 1: ...Service Manual Model C2100 Service Manual C2100 P N MMBD0048201 Date April 2005 Issue 1 0 ...
Page 76: ...4 TROUBLE SHOOTING 77 4 10 KEY backlight Trouble Test Points Figure 4 21 ...
Page 104: ... 105 8 PCB LAYOUT ...
Page 105: ... 106 8 PCB LAYOUT ...
Page 113: ...10 STAND ALONE TEST 114 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 117: ...Note 118 ...
Page 119: ......
Page 135: ......