VSX-AX4AVi-S
195
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Step 3: Operation of the Master Clock
IC352 (Pin 4)
1st Block 1.2V
Is the voltage
1.2V?
No
No
Yes
Yes
Is IC352
abnormally hot?
A
J
IC101 (Pin 1, etc.)
DSP 1.2V
Is the voltage
1.2V?
No
K
Check the output from the
DIGITAL MOTHER Assy.
Check the parts and patterns
in the path.
CN351 (Pin 23)
CLK_ON
Is the logic
gate "L"?
No
Yes
Q
R
Replace IC301, Q301, or X301.
(It is most likely that IC301 or Q301
is in failure.)
Does the
crystal oscillate
at 20 MHz
?
No
Yes
Check the path, or replace IC301.
Check the path, or replace IC301.
R131
MCLK1
No
Yes
S
IC201 (Pin 45)
MCLK2
No
Yes
T
Check the parts and patterns
in the path.
IC107 (Pin 14)
Buffer
Is the voltage
3.3V?
No
Yes
IC354 (Pin 3)
2nd Block 3.3V
Is the voltage
3.3V?
No
No
Yes
Yes
Is IC354
abnormally hot?
L
IC201 (Pin 3, etc.)
DSP 3.3V
Is the voltage
3.3V?
No
M
Check the parts and patterns
in the path.
Yes
IC301 (Pin 8)
OSC Inverter
Is the voltage
3.3V?
No
N
Check the parts and patterns
in the path.
Yes
IC355 (Pin 2)
2nd Block 1.25V
Is the voltage
1.25V?
No
No
Yes
Yes
Is IC355
abnormally hot?
O
IC201 (Pin 8, etc.)
DSP 1.25V
Is the voltage
1.25V?
No
P
Check the parts and patterns
in the path.
Yes
Yes
I
To Step 3
To Step 4
Replace IC352.
Replace IC354.
Replace IC355.
The output and GND may be short-
circuited. Check the path between
them.
The output and GND may be short-
circuited. Check the path between
them.
The output and GND may be short-
circuited. Check the path between
them.
Is there
an operation-master
clock signal
(20 MHz)?
Is there
an operation-master
clock signal
(20 MHz)?
