Only For Training And Service Purposes - LG KP235 Service Manual

4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
R514
CIRCUIT
C518
0.1u
WAVEFORM
Graph 4.2.1(a)
LGE Internal Use Only
L500
C506
NA
NA
C511 1000p
R515
AFC
1K
- 42 -
CHECKING FLOW
Yes
26 MHzO.K?
No No
Change X500
Close to BT Module
2V75_VVCXO
R514
0
C507 C508
2.2u 39p
5
VCC
2 4
GND
3
C516
NA
R516 1M
Graph 4.2.1(b)
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

Crystal Circuit is OK
See next Page to check See next Page to check
Mobile SW Mobile SW
26MHz_BT
26M