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4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
CIRCUIT
2V75_VVCXO
RX1900B
25
RX1900
VLDO2
26
16
RX1800B
VLDO1
U502
27
15
RX1800
VBAT
28
14
RX900B
AD6548
VDD
29
13
RX900
EUSY0280101
VCC_TXVCO
30
12
RX850B
TXOP_HI
31
11
WAVEFORM
LGE Internal Use Only
C511
X500
C511
1000p
R515
AFC
1K
C518
0.1u
C519
0.1u
2V8_VMEM
CHECKING FLOW
Yes
26 MHzO.K?
No
No
Change X500
5
VCC
2
4
GND
3
C516
NA
R516
1M
U500
MC74VHC1G04DFT2G
VBAT
Copyright © 2008 LG Electronics. Inc. All right reserved.
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Crystal Circuit is OK
See next Page to check
See next Page to check
Mobile SW
Mobile SW
26M
Only for training and service purposes
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