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4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4.3 Checking VCTCXO Block
The reference frequency (19.2MHz) from X100 (VCXO) is used UMTS TX part,
GSM part and BB part.
TCXO
0.01u
C141
1000p
C145
X100
2
GND
OUT
3
VCC
4
VCONT
1
19.2MHz
U102
TC7SH04FS
C144
1000p
0.1u
C139
1000p
C140
100K
R120
C147
1000p
C148 8200p
100ohm
R115
TRK_LO_ADJ
VREG_TCXO_2.85V
TCXO_BT
VREG_BT_2.85V
TCXO_PM
RTR6275_TCXO
Schematic of the TCXO Block
TP1
TP2
TP3
TP4
Test Point of the TCXO Blcok
TP1
TP2
TP4
TP3
Содержание KE990 - Viewty Cell Phone 100 MB
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