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4. TROUBLE SHOOTING
4.4.1 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.
X101
W-191-866
4
GND2
1
C107
HOT1
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>
LGE Internal Use Only
No
Replace X101
Checking Points
3
HOT2
GND1 2
26MHz
DITHERING
C108
C109
0.5p
10p
C112
4.7p
< DCXO Placement>
Pin 1
<DCXO Waveform>
Copyright © 2008 LG Electronics. Inc. All right reserved.
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C107
R105
X101
Waveform
Frequency
Only for training and service purposes
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