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Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
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4.3 Checking TCXO Block
The output frequency (19.2MHz) of TCXO (X331) is used as the reference one of RTR6285 and PM7540 internal
VCO.
Schematic of the Crystal Part (19.2MHz)
TP3
TP2
TP3
TP1
TP1
TP2
10n
C331
100
R331
C332
100p
1n
C339
0.1u
C340
VREG_TCXO_2.85V
1n
C341
19.2MHz
KT3225L19200DCW28RA0
X331
4
2
3
1
VCONT
OUT
GND
VCC
TCXO_PM_19.2MHZ
RTR_TRK_LO_ADJ
TCXO_RTR_19.2MHZ
TCXO_USB_XO
3
0
6
0
0603
1.0T
Clesed to TCXO
Schematic of the Crystal Part(19.2MHz)
TP1
TP3
TP2
Содержание E900
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