VSX-1017AV-K
56
1
2
3
4
1
2
3
4
C
D
F
A
B
E
Step 3: Operation of USB Media control IC
Does the
crystal oscillator
at 1
2
MHz
?
Check the
M
OT
HER Assy.
Note:
Please confirm it with the USB memory connected for the content.
I
C701 (pins 7,
24
,
4
0,58,7
3
,7
4
,91,110,1
24
)
USB Media control
I
C
10
Replace
I
C771.
Yes
Yes
Yes
I
s pin
4
(C
T
L) of
I
C771
high
?
I
s
the voltage
5 V
?
N
o
Yes
I
s
the voltage
1.8 V
?
Yes
I
s pin 1
(C
T
L) of C
N
70
2
high
?
N
o
N
o
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
N
o
C
N
701 (pin 1)
USB Bus power
1
2
I
s
the voltage
5 V
?
Check the parts and
patterns in the path.
Power supply is
O
K.
T
o S
T
EP
3
N
o
XRS
T
must be high during operation.
Check the M
OT
HER Assy.
USB
-T
x and USB
-
Rx should be
high during operation.
Check the pattern in the path.
Check the M
OT
HER Assy.
Replace
I
C76
2
,
I
C701,
I
C761.
Check the parts and patterns in the path.
Replace X70
2
, etc.
N
o
Fig. 1
I
C771 (pin 1)
USB Power SW output
11
Yes
Yes
I
s XRS
T
high
?
N
o
Yes
N
o
I
C701 (pins 7
4
,75)
USB
-T
x/USB
-
Rx (Refer to Fig. 1 and
2
)
X
IN
/X
O
U
T
A
B
IC701
CN702
XRS
T
pin 77
R951
pin 5
USB
-
Rx
pin 96
R955
pin 10
Fig.
2
IC701
IC951 (3 V
→
5 V)
CN702
USB
-T
x
pin 95
pin
2
pin
4
pin 11
Does
USB
-T
x and USB
-
Rx
Communicate with
System CPU
?
Содержание Elite VSX-90TXV
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