Service manual

40
VSX-918V-K
1
2 3 4
A
B
C
D
E
F
1
2 3 4
Step 4: Operation of iPod (Authentication process)
Do
CPCK and CPDT
communicate?
Does
CPREADY work?
Check the oscillation
circuit.
Ye s
No No
IC481 (pins 7, 15)
CPCK, CPDT (I2C between IC401 and IC481)
Ye s
Ye s
Does the
X481 oscillate with
32.576 KHz?
Does CPRESET
(pin 38) reset it?
High (3.3V) after the reset
Replace IC481.
When CPDT and CPCK are
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).
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).
No
Check the path between
IC401 (pin 108).
No
IC481 (pin 11)
CPREADY
Replace IC481
or X481, etc.
No
Ye s
Ye s
Step 5: Audio Out check
Is there
a SPDIF
signal
?
Check the output from
IC701 (pin 105) and R421.
Ye s
No
IC401 (pin 5)
RX6 (S/PDIF) output
Is there
a SPDIF
signal
?
Check the parts and pattern
between IC101 and CN401.
Ye s
No
IC101 (pin 5)
RX6 (S/PDIF) input for DIR
Note: Please confirm it with connecting the iPod.
Operation of IC481 is OK.
To STEP 5
Refer to the
DSP troubleshooting.