4. TROUBLE SHOOTING
- 50 -
(2) Checking VCTCXO Circuit
X500. 4
X500. 3
Figure 4-3
Graph 4-1(a)
Graph 4-1(b)
Test Points
Checking Flow
Circuit Diagram
Waveform
Check Pin 3.
Refer to Graph 4-1(b)
26 MHzO.K?
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 4-1(a)
2.75V OK?
No
No
Yes
Changing X500
Check U101, PMIC
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
Содержание C2100
Страница 1: ...Service Manual Model C2100 Service Manual C2100 P N MMBD0048201 Date April 2005 Issue 1 0 ...
Страница 54: ...4 TROUBLE SHOOTING 55 4 2 TX Trouble SW500 U503 X500 FL500 U501 U505 5 4 1 3 2 Test Points Figure 4 7 ...
Страница 70: ...4 TROUBLE SHOOTING 71 4 7 MIC Trouble Soldering Check U203 C225 C224 C230 Test Points Figure 4 18 ...
Страница 76: ...4 TROUBLE SHOOTING 77 4 10 KEY backlight Trouble Test Points Figure 4 21 ...
Страница 104: ... 105 8 PCB LAYOUT ...
Страница 105: ... 106 8 PCB LAYOUT ...
Страница 113: ...10 STAND ALONE TEST 114 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 117: ...Note 118 ...
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