Pioneer VSX-918V-S Service Manual page 40

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Step 4: Operation of iPod (Authentication process)
A
IC481 (pins 7, 15) CPCK, CPDT (I2C between IC401 and IC481)
Do
CPCK and CPDT
communicate?
Yes
CPREADY
IC481 (pin 11)
B
Does
CPREADY work?
Yes
CPREADY becomes High (3.3V) just after the iPod connection.
It becomes Low for authentication start (about 10 seconds later)
It becomes High again for authentication completion (about 60
seconds later).
Yes
C
Operation of IC481 is OK.
To STEP 5
TE
L 13942296513
Step 5: Audio Out check
IC401 (pin 5)
RX6 (S/PDIF) output
D
Is there
a SPDIF
signal
?
Yes
IC101 (pin 5)
RX6 (S/PDIF) input for DIR
Is there
a SPDIF
signal
?
E
Yes
Refer to the
DSP troubleshooting.
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When CPDT and CPCK are
No
normal operation = High (3.3V).
Connect iPod, and communicate
it about 10 seconds later
(authentication starts).
And communicate it about 60
seconds later (authentication is
complete).
No
Replace IC481.
No
Check the output from
IC701 (pin 105) and R421.
No
Check the parts and pattern
between IC101 and CN401.
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Note: Please confirm it with connecting the iPod.
Does CPRESET
No
(pin 38) reset it?
High (3.3V) after the reset
Yes
Does the
X481 oscillate with
32.576 KHz?
Yes
Check the oscillation
circuit.
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No
Check the path between
IC401 (pin 108).
No
Replace IC481
or X481, etc.
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