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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.3 Checking TCXO Block
The output frequency (19.2MHz) of TCXO (X101) is used as the reference one of RTR6285 and
PM7540 internal VCO.
TCXO Circuit
1000p
C70
33
R126
C64
1000p
0.01u
C67
0.1u
C71
100ohm
R117
VREG_MSME_1.8V
2
GND
1
4
5
VCC
U103
TC7SH04FS
100p
C66
VREG_TCXO_2.85V
C65
0.1u
100p
C73
C74
100p
3
OUT
VCONT
1
4
VDD
X101
19.2MHz
DSA321SCA
EXSK0005704
2
GND
100K
R122
TCXO_RTR_19.2MHz
TCXO_PM_19.2MHz
RTR_TRK_LO_ADJ
USBH_REF_CLK
TP1
TP1
TP1
Schematic of the Crystal Part (19.2MHz)
TP1
TP2
TP3
Summary of Contents for CT815
Page 1: ...Date May 2009 Issue 1 0 Service Manual Model CT815 Service Manual CT815 Internal Use Only ...
Page 221: ...Note ...
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