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5
Check 5 : 27 MHz operated normally?
An oscillating crystal(X1501) of 27 MHz is used to
clock signals by the IC1507.
<Check>
Verify the voltage of the sensing pin in the state where the power supply is on.
It checks on the basis of DGND
If locations listed under "verification location 2", can be verified, there will be no need to perform verifications
for the locations listed under "verification location 1."
If the result is not satisfactory, check to see if there are any problems with the resin flux cored solder and other
defects in the applicable line, vicinity of IC 1501 and peripheral components..
Verification location 1
No.
(Sensing pin)
1 -
GND
Side A
Verification location 2(IC1501)
5
6
X1501
27MHz
crystal
Verification location 2
IC1501 pin163
Rated Value 1
Fig.5.2 : Clock rated values
Fig.5.3 : 27 MHz check point
AVH-P7800DVD/UC
6
7
IC1501
DVD-LSI
OSCO
27 MHz
OSCI
VCC33
Rated value 1
Media
27 MHz
ALL
pin163
DGND2
Verification location 2_Enlargement
7
8
VCC12
Fig.5.1 : Clock
50 ppm
IC1501
189
8
A
B
C
D
E
F
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