Only For Training And Service Purposes - LG MG295 Service Manual

4. TROUBLE SHOOTING
(1) Checking Crystal Circuit
TEST POINT
X501
Figure 7
CIRCUIT
Waveform
LGE Internal Use Only
R508
MC74VHC1G04DFT2G
C511
1000p
VCC
2
GND
Graph 4.2.1(a)
Checking Flow
Yes
26 MHzO.K?
No No
Change X501
2V75_VVCXO
U501
5
4
3 C515
R509
2.2u
1M
Graph 4.2.1(b)
Copyright © 2007 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_DBB
26M_BT
R508
0

Only for training and service purposes