Marantz AV8802/U1B - Page 96

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