Pioneer VSX-94TXH Service Manual page 62

1
TROUBLESHOOTING THE NETWORK BLOCK
QQ
3 7 63 1515 0
Step 1:Connectors
A
CN10, CN801, CN901(FFC)
Are the
No
connectors
securely
inserted?
Yes
To STEP 2
Step 2:Power supply
1 CN10 (Pins1-2) 5V input
B
Is the No
voltage 5V?
Yes
2 IC11 (Pin 2) 3.3V Regulator IC input
C
Is the No
voltage 5V?
Yes
TE
L 13942296513
3 IC31 (Pin 2)
Is the No
voltage 5V?
Yes
D
4 IC801 (Pin 5) USB Power SW
Is the No
voltage 5V?
Yes
5 IC11 (Pin 4), IC21 (Pin 2)
E
Is the No
voltage 3.3V?
Yes
The output and GND may be
short-circuited. Check the path
www
between them.
F
62
1
http://www.xiaoyu163.com
2
Insert the connectors securely.
Is there
No
any loose
connection of
CN902?
Yes
Check the MAIN
Ass'y
To STEP 1
Check the parts and patterns in
the path.
Check the patterns inthe path.
Check the parts and patterns in
the path.
3.3V Reg. output/1.8V Reg. input
Is IC11
No
abnormally
hot?
Yes
Replace IC11.
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VSX-94TXH
2
http://www.xiaoyu163.com
3
8
6 IC881 (Pins 37,47)
Is the
voltage 3.3V?
Yes
7 IC891 (Pins 1,3,9,14,27,43,49)
Is the
voltage 3.3V?
Yes
8 IC911 (Pin 14)
Is the
voltage 3.3V?
Yes
IC701 (Pins 3,16,32,43,55,61,78,89,103,
9
113,125,136,151,158,176,192,201)
Is the
voltage 3.3V?
Q Q
3 6 7 1 3
Yes
IC861 (Pins 14, 36, 48)
Is the
voltage 3.3V?
Yes
10 IC21 (Pin 4)
Is the
voltage 1.8V?
Yes
The output and GND may be
short-circuited. Check the path
between them.
A
u163
.
3
4
2 9 9 4 2 8
FLASH ROM
No
Check the parts and patterns in
the path.
SDRAM
No
Check the parts and patterns in
the path.
5-3 Converter
No
Check the parts and patterns in
the path.
NETWORK Media
processor IC
No
Check the parts and patterns in
the path.
1 5 0 5 8 2 9 9 4
No
Check the parts and patterns in
the path.
1.8V Regulator output
Is IC21
No No
abnormally
hot?
Yes
Replace IC21.
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co
4
9 9
2 8 9 9