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