LG KG271 - Page 47

4. TROUBLE SHOOTING
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RX Trouble
(1) Checking VCTCXO Circuit
U400
SW400
U102
FL400
X101
FL401
Is the waveform
of Pin3 similar to
DCXO(X101)
Waveform?
Replace
X101
Yes
No
DCXO Circuit is OK.
See next page to check
PLL Circuit.
( NX3225SA(W-188-34-7)
2
GND1
GND2
4 1
HOT1
HOT2
3
NX3225SA
X101
26MHz
2V8_VIO
NA
R107
TEST POINT
CIRCUIT
Waveform
Pin 2
Pin 1
Waveform
CHECKING FLOW