LG 410G Service Manual page 40

4.4.1 DCXO Part
CHECKING FLOW
Is the waveform
of Pin1 similar to
DCXO(X101)
Waveform?
Yes
DCXO Circuit is OK.
See next page to check
PLL Circuit.
TP1
C107
1000p
J12
NC10
H12
NC11
G12 R105
NC12
L11
NC13
1.5M
K11
NC14
J11
NC15
H11
NC16
L10
NC17
K10
NC18
J10
NC19
U1
SPARE3
U2
SPARE2
D15
XTAL
< DCXO Circuit>
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
No
Replace X101
Checking Points
X101
W-191-866
4
3
GND2 HOT2
1 GND1 2
HOT1
26MHz
R104
220K C108 C109
0.5p 10p
C112
4.7p
< DCXO Placement>
Pin 1
D
<DCXO Waveform>
-37-
- 41 -
4. TROUBLE SHOOTING
C107
R105
X101
Waveform
Frequency
LGE Internal Use Only