LG MG120a Service Manual page 37

(2) Checking VCTCXO Circuit
TEST POINT
X100.3
(OUT)
X100
X100.4
(VCC)
CIRCUIT
WAVEFORM
Graph 1(a)
CHECKING FLOW
Check Pin 3.
26 MHzO.K?
Refer to Graph 4-1(b)
¨
2.75V OK?
Check Pin 4.
Refer to Graph 4-1(a)
¨
Check U201, PMIC
-37-
4. TROUBLE SHOOTING
VCTCXO Circuit is OK VCTCXO Circuit is OK
Yes
See next Page to check See next Page to check
Mobile SW Mobile SW
No No
Yes
Changing X100
No
Graph 1(b)