Checking Vctcxo Block - LG KF310 Service Manual

4.13 Checking VCTCXO Block

The reference frequency (19.2MHz) from X1000 (VCXO) is used UMTS TX part, GSM part and BB
part.
VREG_TCXO_2.85V
TCXO
TCXO_PM
TCXO_RTR
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TP1
DSA321SCE-19.2M X1000
4
VCC
3
OUTPUT
8
NC4
7
NC3
C1071 100p
TP4
C1072 1000p
TP3
[Fig.] Schematic of the TCXO Block
[Fig.] Test Point of the TCXO Block
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4. TROUBLE SHOOTING
TP2
100ohm R1019
1
VCONT
2
GND
5
NC1
6
NC2
TRK_LO_ADJ
LGE Internal Use Only