40
VSX-
8
21-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Step 0: Preliminary confirmation
Confirm the following items before checking
To Step 1
Do screws of USB Assy
securely tighten?
Yes
[4] iPod TROUBLESHOOTING
Tighten screws securely.
N
o
OK
Step 1: Power supply
C
N
801 (pins1, 2)
IC806 (pin 2)
Is the voltage 12
V
?
Is the voltage 5
V
output?
Is pin 6 (en) of IC806 high?
Is the voltage of 5
V
input?
Is the voltage 3.3
V
output?
Is the voltage of 12
V
input?
Yes
Yes
Check the wire between USB and
MAI
N
Assys.
N
o
12
V
input
12
V
input
IC806 (pins 7, 8)
Yes
REG2 (pin 3)
Yes
Check the IC806 and its peripheral
circuits.
N
o
N
o
Is REG2 abnomally hot?
N
o
N
o
(to chassis)
(to chassis)
REG2 (pin 2)
Yes
Yes
Yes
3.3
V
output
Check the pattern in the path.
N
o
The output and G
N
D may be
short-circuited. Check the path
between them.
Check the IC806 and its peripheral
circuits. (CP803 pin 5)
N
o
Check the MAI
N
Assy.
OK
Replace IC806.
OK
Replace IC806.
Replace REG2.
D
Summary of Contents for VSX-521-K
Page 13: ...13 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F ...
Page 17: ...17 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F D MAIN ASSY C AMP ASSY D MAIN ASSY E SUBWOOFER ASSY ...
Page 21: ...21 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F ...
Page 22: ...22 VSX 821 K 1 2 3 4 A B C D E F 1 2 3 4 4 5 D MAIN BLOCK DIAGRAM for VSX 921 K T D MAIN ASSY ...
Page 23: ...23 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F ...
Page 27: ...27 VSX 821 K 5 6 7 8 5 6 7 8 A B C D E F only P CPU ASSY Not used ...
