I2C Communication Wave Form (Sample) - Denon AVR-X6400H Service Manual

A
Use a jig to extend the DIGITAL PCB
q
Check the power supply voltage.
AUDIO/VIDEO PCB
V+3.3V : C3748 + q
V-5V : C3749 - w
YES
w
Check of the I2C control signal for video selector IC
[U3703].
CONNECT-2 PCB
I2C(SCL) : C3732 e
I2C(SDA) : C3733 r
See the sample waveform
YES
e
Does the signal input to the video selector IC
[U3703]?
V : C3714 t
Component-Y : C3705 y
Component-Cb : C3706 u
Component-Cr : C3707 i
YES
r
Does the signal output to the video selector IC
[U3703]?
V (to Monitor out) : R3740 o
V (to Z2 Monitor out) : R3731 Q0
V (to DIGITAL PCB) : R3736 Q1
Componnet-Y (to Monitor out) : R3742 Q2
Componnet-Cb (to Monitor out) : R3746 Q3
Componnet-Cr (to Monitor out) : R3750 Q4
Componnet-Y (to DIGITAL PCB) : R3744 Q5
Componnet-Cb (to DIGITAL PCB) : R3748 Q6
Componnet-Cr (to DIGITAL PCB) : R3752 Q7
YES
Output terminal [K3503 or K3505] faulty.
TV monitor connection error or contact failure.
NO
FFC connection error or contact failure. [N9018]
Power IC [U7524] failure (V-5V).
DIGITAL PCB DV+3.3V, DV5V
NO
FFC connection error or contact failure.
(Between [N90181] and DIGITAL PCB [N6010])
DIGITAL PCB faulty.
NO
Input terminal [K3503 / K3501] faulty, or a fault
occurs between video select IC [U3703].
NO
Input terminal [K3503 / K3501] faulty, or a fault
occurs between video select IC [U3703].

I2C communication wave form (sample)

CLK
DATA
86