Pioneer VSX-820-K Service Manual page 40

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QQ
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A
Step 3: Operation of iPod (Authentication process)
IC804 (pins 12, 13) SCL, SDA (I2C between IC801 and IC804)
Do
SCL and SDA
communicate?
Yes
B
Operation of IC804 is OK.
To STEP 4
Step 4 Audio Out check
C
CN805 (pin 1)
S/PDIF output
Is there
TE
L 13942296513
a S/PDIF signal
?
Yes
D
Refer to the [1] DSP
TROUBLESHOOTING.
E
www
F
40
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http://www.xiaoyu163.com
2
When SCL and SDA are
No
normal operation = High (3.3 V),
connect iPod, and communicate
it about 10 seconds later
(authentication starts).
And communicate it about 60
seconds later (authentication is
complete).
Check the
No
path between IC801
(pin 105)
Yes
Check the parts and pattern
of CN805 and IC801.
x ao
y
. i
2
http://www.xiaoyu163.com
3
8
Does RESET_AUTH
No
(pin 4) reset it?
High after the reset
Yes
Replace IC804.
Q Q
No
3 6 7
Replace IC801.
u163
VSX-820-K
3
4
2 9 9 4
No
Check the path between
IC801 (pin 120).
1 3 1 5 0 5 8 2 9
m
co
.
4
2 8
9 9
9 4 2 8 9 9