Ipod Troubleshooting - Pioneer VSX-821-K Service Manual

1
A

[4] iPod TROUBLESHOOTING

Step 0: Preliminary confirmation
Confirm the following items before checking
Do screws of USB Assy
securely tighten?
Yes
B
To Step 1
Step 1: Power supply
CN801 (pins1, 2)
Is the voltage 12 V?
Yes
IC806 (pin 2)
C
Is the voltage of 12 V input?
Yes
IC806 (pins 7, 8)
Is the voltage 5 V output?
Yes
D
REG2 (pin 3)
Is the voltage of 5V input?
Yes
REG2 (pin 2)
Is the voltage 3.3 V output?
E
Yes
D
F
40
1
2
No
Tighten screws securely.
12 V input
No
Check the wire between USB and
MAIN Assys.
12 V input
No
Check the IC806 and its peripheral
circuits.
No
Is pin 6 (en) of IC806 high?
Yes
(to chassis)
No
Check the pattern in the path.
(to chassis)
3.3 V output
No
Is REG2 abnomally hot?
Yes
The output and GND may be
short-circuited. Check the path
between them.
VSX-821-K
2
3
OK
Check the MAIN Assy.
OK
Replace IC806.
No
Check the IC806 and its peripheral
circuits. (CP803 pin 5)
No
Replace REG2.
3
4
OK
Replace IC806.
4