Pioneer XW-NAC3-K Service Manual page 19

5
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[2] TROUBLESHOOTING
Step 1:Connections
CN10, CN801, CN901(FFC)
Are the
connectors
securely
inserted?
Yes
To STEP 2
Step 2:Power supply
1 CN10 (Pins1, 2)
Is the
voltage 5 V?
Yes
2 IC11 (Pin 2)
TE
L 13942296513
Is the
voltage 5 V?
Yes
3 IC31 (Pin 2)
Is the
voltage 5 V?
Yes
4 IC801 (Pin 6)
Is the
voltage 5 V?
Yes
5 IC11 (Pin 4), IC21 (Pin 2)
Is the
voltage 3.3 V?
Yes
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.
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No
Insert the connectors securely.
5V input
Is there
No No
any loose
connection of
CN10?
Yes
Check CP1005 of
the MAIN PCB Assy.
To STEP 1
3.3V Regulator IC input (1)
No
Check the patterns in the path
between CN10 and IC11.
3.3V Regulator IC input (2)
No
Check the patterns in the path
between CN10 and IC31.
USB Power SW
No
Check the patterns in the path
between CN10 and IC801.
3.3V Regulator IC output (1)
/1.8V Regulator IC input
Is IC11
No No
abnormally
hot?
Yes
Replace IC11.
x ao u163
y
The output of IC11 and GND may be
short-circuited. Check the path
i
between them.
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2 9
8
6 IC31 (Pin 4)
Is the
voltage 3.3 V?
Yes
7 IC881 (Pins 37,47)
Is the
voltage 3.3 V?
Q Q
3 6 7 1 3 1 5
Yes
8 IC891 (Pins 1,3,9,14,27,43,49)
Is the
voltage 3.3 V?
Yes
9 IC911 (Pin 14)
Is the
voltage 3.3 V?
Yes
IC701 (Pins 3,16,32,43,55,61,78,89,103,
10
113,125,136,151,158,176,192,201)
Is the
voltage 3.3 V?
Yes
11 IC861 (Pins 14, 36, 48)
co
Is the
voltage 3.3 V?
.
Yes
A
XW-NAC3-K
7
8
9 4 2 8
3.3V Regulator IC output (2)
Is the
No Yes
voltage of IC31
Pin 1 (CONT)
1.8 V?
No
Check the output
of IC21 (1.8 V).
Is IC31
No
abnormally
hot?
Yes
Replace IC31.
The output of IC31 and GND may be
short-circuited. Check the path
between them.
FLASH ROM
No
Check the patterns in the path
between IC31 and IC881.
0 5 8 2 9 9 4 2 8
SDRAM
No
Check the patterns in the path
between IC31 and IC891.
5-3 Converter IC
No
Check the patterns in the path
between IC31 and IC911.
NETWORK Media
processor IC
No
Check the patterns in the path
between IC31 and IC701.
m
Ethernet PHY IC
No
Check the patterns in the path
between IC31 and IC861.
8
9 9
A
B
C
9 9
D
E
F
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