LG KP260 Service Manual page 46

(1) Checking Crystal Circuit
TEST POINT
X401
CIRCUIT
C520
0.1u
2V8_VMEM
TP1
C522
0.1u
WAVEFORM
Graph 4.2.1(a)
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Only for training and service purposes
TP2
TP1
VBAT 2V75_VVCXO
C513
1000p
- 47 -
4. TROUBLE SHOOTING
CHECKING FLOW
Yes
26 MHzO.K?
No No
Change X500
U500
Not Mount
TP2 5
VCC
2 4
GND
3
R509
0
26M_DBB
Graph 4.2.1(b)
Crystal Circuit is OK
See next Page to check See next Page to check
Mobile SW Mobile SW
2V75_VVCXO
26M_BT
C514
2.2u
LGE Internal Use Only