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4.3.1 DCXO Part
CHECKING FLOW
Is the wavefo rm
of Pin1 sim ila r to
DCXO(X101)
Waveform ?
Yes
DCXO Cir cuit i s OK.
See nex t page t o check
PLL Circ ui t.
4
1
C107
1000p
R104
J12
NC10
220K
H12
NC11
R105
G12
NC12
L11
NC13
1.5M
K11
NC14
J11
NC15
H11
NC16
L10
NC17
K10
NC18
J10
NC19
U1
SPARE3
U2
SPARE2
D15
XTAL
L8
< DCXO Circuit>
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
No
Replace X101
Checking Points
X101
W-191-866
3
GND2
HOT2
GND1 2
HOT1
26MHz
DITHERING
C108
C109
0.5p
10p
C112
4.7p
4. TROUBLE SHOOTING
< DCXO Placement>
Pin 1
<DCXO Waveform>
- 43 -
C107
R105
X101
Waveform
Frequency
LGE Internal Use Only
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