58
SC-LX81
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Step
8
: Communication between DM
8
50E and iPod Co-Processor
CPCK(Pin7)
CPDT(Pin15)
CPRDY :
Step 9 : Photo Image Output
Is there the I2C
serial
communication
signal ?
N
o
IC791(Pin7,15)
Yes
They are ordinary high level(3.3
V
).
After the iPod is connected, I2C communication
is done after 10second and 70second.
Is CPRST high ?
IC791(Pin11)
Is there the BT.656
digital video signal?
N
o
C
N
701(Pin2,4,5,6,7,161,162,163,164)
Yes
Check the HDMI
circuit on this board.
Check the DM
8
50E
operation
After the iPod is connected,
it changes from high level to
low level in 10 seconds , and
it returns low level to high
level in 60 seconds.
Yes
Does X791 oscillate
in the frequency of
32.76
8
KHz?
Yes
N
o
Check the path between
IC701(Pin 20).
N
o
Replace IC791 or X791
etc.
Replace IC791etc.
Is CPRDY OK?
Operation of IC791 is OK.
Yes
Check the path between
IC701(Pin 35).
N
o