LG KP260 - Page 46

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4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
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TP1
X401
TP2
26 MHzO.K?
No
No
Crystal Circuit is OK
See next Page to check
Mobile SW
See next Page to check
Mobile SW
Yes
Change X500
TEST POINT
WAVEFORM
CIRCUIT
CHECKING FLOW
Graph 4.2.1(a) Graph 4.2.1(b)
VBAT 2V75_VVCXO2V8_VMEM
0.1u
C522
0.1u
C520
Not Mount
2V75_VVCXO
R509
0
C513
1000p
2.2u
C514
U500
2
GND
3
5
VCC
4
26M_DBB
26M_BT
TP1
TP2