Checking Tcxo Block - LG -P698 Service Manual

4.3 Checking TCXO Block

The output frequency (19.2MHz) of TCXO (X200) is used as the reference one of RTR6285 and
PM7540 internalVCO.
TCXO Circuit
R2002
RTR_TRK_LO_ADJ
Clesed to TCXO
LGE Internal Use Only
TP2
Schematic of the Crystal Part(19.2MHz)
Rev.C Changed 2011.4.26
TP2
X2000 X1G003581002700
1 4
100
VC VCC
5 6
TP1 TP2
2 3
C2005
GND OUT
10n 19.2MHZ
0.8T
TP1
TP3
TP1
0603
C2001
C2000
1n
0.1u
0603
C2004
100p
C2006
1n
R2006
VREG_MSMA_2.6V
TP3
1
TCXO_EN
C2018 2
100p
0603
- 74 - Copyright © 011 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
VREG_TCXO_2.85V
TCXO_PM_19.2MHZ
TCXO_RTR_19.2MHZ
220
C2007 0.1u
5
VCC
4
R2009 33
U2000
GND
3
R2010 100K
Only for training and service purposes
USBH_SYSCLK