Checking Vctcxo Block; Only For Training And Service Purposes - LG KS20 Operating Instructions Manual

4.4 Checking VCTCXO Block

The reference frequency (19.2MHz) from X100 (TCXO) is used in UMTS TX
part, GSM part and BB part.
TP2
R517
RTR_TRK_LO_ADJ
100ohm
TP4
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

TCXO Circuit
X500
1
VCONT VCC
2
C551 GND OUT
0.01u
19.2MHz
EXSK0007802
TG-5010LH_19_2M_75A
Schematic of the TCXO Block
TP3
Test Point of the TCXO Block
4. TROUBLE SHOOTING
C542
C544
1000p
0.1uF
4
3 100p
1000p
TP2
TP1
- 87 -
TP1
VTCXO_2.85V
TP4
C548
TCXO_PM_19.2MHz
C552
TCXO_RTR_19.2MHz
TP3
LGE Internal Use Only