XC-Z9
27
5
6
7
8
5
6
7
8
C
D
F
A
B
E
5.3.2 TROUBLESHOOTING THE NETWORK BLOCK
Insert the connectors securely.
CN10, CN801, CN901(FFC)
No
Yes
Check the parts and patterns in
the path.
CN10 (Pins1-2)
5V input
1
No
No
Yes
Check the MAIN
Assy.
Yes
To STEP 2
Are the
connectors
securely
inserted?
Is the
voltage 5V?
Step 1:Connectors
Step 2:Power supply
Is there
any loose
connection of
CN10?
IC11 (Pin 2)
3.3V Regulator IC input
2
3
No
Yes
Is the
voltage 5V?
Check the parts and patterns in
the path.
IC801 (Pin 5)
USB Power SW
4
Check the patterns in the path.
IC31 (Pin 2)
No
Yes
Is the
voltage 5V?
Check the parts and patterns in
the path.
Check the parts and patterns in
the path.
IC701 (Pins 3,16,32,43,55,61,78,89,103,
113,125,136,151,158,176,192,201)
NETWORK Media
processor IC
9
No
Yes
Is the
voltage 3.3V?
IC861 (Pins 14, 36, 48)
No
Yes
Is the
voltage 3.3V?
Check the parts and patterns in
the path.
IC881 (Pins 37,47)
FLASH ROM
6
No
Yes
Is the
voltage 3.3V?
Check the parts and patterns in
the path.
IC891 (Pins 1,3,9,14,27,43,49)
SDRAM
7
No
Yes
Yes
Is the
voltage 3.3V?
Check the parts and patterns in
the path.
IC911 (Pin 14)
5-3 Converter
8
No
Is the
voltage 3.3V?
To STEP 1
3.3V Reg. output/1.8V Reg. input
No
Replace IC11.
Yes
Is IC11
abnormally
hot?
The output and GND may be
short-circuited. Check the path
between them.
A
IC21 (Pin 4)
1.8V Regulator output
10
No
Yes
Is the
voltage 1.8V?
No
Replace IC21.
Yes
Is IC21
abnormally
hot?
The output and GND may be
short-circuited. Check the path
between them.
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