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4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
CIRCUIT
2V75_VVCXO
RX1900B
RX1900
RX1800B
U501
RX1800
RX900B
AD6548
RX900
VCC_TXVCO
WAVEFORM
Graph 4.2.1(a)
LGE Internal Use Only
X401
TP1
TP2
TP1
TP1
C509
0.1u
VLDO2
16
VLDO1
15
VBAT
14
VDD
13
12
CHECKING FLOW
Yes
26 MHz O.K?
No
No
Change X500
TP2
R507
Graph 4.2.1(b)
- 42 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Crystal Circuit is OK
See next Page to check
See next Page to check
Mobile SW
Mobile SW
TP2
0
26MHz_BT
26M_DBB
Only for training and service purposes
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