Pioneer VSX-516-K Service Manual page 116

1
7.3.4.3 Troubleshooting
QQ
Step 1: Connectors 3 7 63 1515 0
CN701, CN702
A
Are
the connectors
securely inserted
?
Yes
To STEP 2
Step 2: Power supply
B
CN702 (pin 4)
1 5 V input
Is
No
the voltage
5 V ?
Yes
2
IC703 (pin 3)
3.3 V Regulator IC input
C
Is
No
the voltage
5 V ?
TE
L 13942296513
Yes
3
IC951 (pin 14) 3-5 Converter
Is
No
the voltage
5 V ?
D
Yes
4
IC771 (pin 5) USB Power SW
Is
No
the voltage
5 V ?
Yes
5
IC7814 (pins 14, 15) DAC
E
Is
No
the voltage
5 V ?
Yes
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116
1
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2
No
Insert the connectors
securely.
Is there
No
any loose
connection
of CN702?
Check the
Yes
MOTHER Assy.
To STEP 1
Check the patterns in
the path.
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
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VSX-516-K
2
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3
8
6
IC703 (pin 1), IC702 (pin 7)
Is
No
the voltage
3.3 V ?
Yes
7
IC762 (pins 37, 47) FLASH ROM
Is
No
the voltage
3.3 V ?
Yes
8
IC761 (pins 1,3,9,14,27,43,49) SDRAM
Is
No
the voltage
3.3 V ?
Yes
9
IC953 (pin 14)
5-3 Converter
Q Q
3 6 7 1 3
Is
No
the voltage
3.3 V ?
Yes
10
IC701 (pins 16,33,64,76,112) USB Media control IC
Is
No
the voltage
3.3 V ?
Yes
11
IC702 (pin 1)
1.8 V Regulator output
Is
No
the voltage
1.8 V ?
Yes
u163
A
.
3
4
2 9 9 4 2 8
3.3 V Reg. output /
1.8 V Reg. input
Is IC703
No
abnormally
hot?
Yes
Replace IC703.
The output and GND may be
short-circuited. Check the path
between them.
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
1 5 0 5 8 2 9 9 4
Check the parts and
patterns in the path.
Check the parts and
patterns in the path.
Is IC702
No
abnormally
hot?
Yes
Replace IC702.
The output and GND may be
short-circuited. Check the path
between them.
m
co
4
9 9
2 8 9 9