Table of Contents
Advertisement
4. TROUBLE SHOOTING
(1) Checking VCTCXO Circuit
TEST POINT
CIRCUIT
C606
100p
Waveform
Graph 4-1(a)
Checking Flow
13 MHzO.K?
Check Pin 3.
Refer to Graph 4 -1(b)
2.75V OK?
Check Pin 4.
Refer to Graph 4-1(a)
Check U101
2V75_VVCXO
X601
3
1
OUT
VCONT
4
2
VCC
GND
C604
13MHz
C605
1000p
2.2u
- 60 -
VCTCXO Circuit is OK
VCTCXO Circuit is OK
Yes
See next Page to check
See next Page to check
ANT SW & Mobile SW
ANT SW & Mobile SW
No
No
Yes
Changing X601
No
R606
12K
Graph 4-1(b)
AFC
Advertisement
Table of Contents
