Marantz AV8802/U1B Service Manual page 96

A
Extend DIGITAL UNIT using a jig
Check power supply voltage.
AUDIO/VIDEO PCB
V +3.3V：
V –5V：
(See 95 page)
YES
Check the I2C control signal of video selector IC
(U3703)
CONNECT-2 PCB
I2C(SCL)：
I2C(SDA)：
see sample waveform
YES
Check the input signal to video selector IC (U3703)
V：
Component-Y：
Component-Cb：
Component-Cr：
YES
Check the output signal from video selector IC (U3703)
V (to Monitor out)：
V (to Z2 Monitor out)：
V (to DIGITAL PCB)：
Component-Y (to Monitor out)：
Component-Cb (to Monitor out)：
Component-Cr (to Monitor out)：
Component-Y (to DIGITAL PCB)：
Component-Cb (to DIGITAL PCB)：
Component-Cr (to DIGITAL PCB)：
Component-Y (to Z2 Monitor out)：
Component-Cb (to Z2 Monitor out)：
Component-Cr (to Z2 Monitor out)：
YES
Output terminal (K3503 or 3502) flaw .
Defective connection of TV Monitor or TV Monitor flaw
I2C communication wave form (sample)
NO
C3748 + q
C3749 – w
NO
C3732 e
C3733 r
NO
C3714 t
C3705 y
C3706 u
C3707 i
NO
R3740 o
R3731 Q0
R3736 Q1
R3742 Q2
R3746 Q3
R3750 Q4
R3744 Q5
R3748 Q6
R3752 Q7
R3762 Q8
R3745 Q9
R3749 W0
CLK
DATA
96
Defective connection of N9014.
Power supply IC flaw.
XLROUT PCB
U6203(V+3.3V), U6204(V–5V)
Defective connection of the connector.
N5909 or N5910
DIGITAL UNIT flaw.
Input terminal (K3503 / K3501) or the parts
of between video select IC (U3703) flaw.
Video selector IC (U3703) flaw.