Denon AVR-4520, Service Manual

Page: 106 / 281

106
I2C communication wave form (sample)
CLK
DATA
AUDIO/VIDEO UNIT flaw.
B
NO
NO
YES
YES
Extend DIGITAL UNIT using a jig.
Power supply IC (U3701 or U3702) flaw.
Defective connection of N4004 or N4007.
Video selector IC (U3703) flaw.
Input terminal (K3503) or the parts of
between video selector IC (U3703) flaw.
Defective connection of N4004 or N4007
or the parts of between video selector IC
(U3703) flaw.
DIGITAL UNIT flaw.
Check the signal output from video selector IC (U3703).
V (to Monitor out)
: R3740
Q3
V (to Z2 Monitor out) : R3731
Q4
V (to Media Player out) : R3733
Q5
V (to DIGITAL UNIT) : R3736
Q6
COMPONENT-Y (to Monitor out) : R3742
Q7
COMPONENT-Cb (to Monitor out) : R3746
Q8
COMPONENT-Cr (to Monitor out) : R3750
Q9
COMPONENT-Y (to Z2 Monitor out) : R3762
W0
COMPONENT-Cb (to Z2 Monitor out) : R3745
W1
COMPONENT-Cr (to Z2 Monitor out) : R3749
W2
COMPONENT-Y (to DIGITAL UNIT) : R3744
W3
COMPONENT-Cb (to DIGITAL UNIT) : R3748
W4
COMPONENT-Cr (to DIGITAL UNIT) : R3752
W5
refer to AVIDEO test point (page 107 ).
Check the signal input to video selector IC (U3703).
from input terminal from DIGITAL UNIT
V : C3714
t
C3033
o
COMPONENT-Y : C3705
y
C3034
Q0
COMPONENT-Cb : C3706
u
C3035
Q1
COMPONENT-Cr : C3707
i
C3036
Q2
refer to AVIDEO test point (page 107 ).
Check power supply voltage and I2C
control signal of video selector IC
(U3703).
V+3.3V
: C3748 +
q
V-5V : C3749 -
w
I2C (SCL) : C3732
e
I2C (SDA) : C3733
r
refer to AVIDEO test point (page
107 ).
NO
Video selector IC (U3703) flaw.
YES
Output terminal (K3503 or K3504 or K3502) flaw.
Defective connection of TV Monitor or TV Monitor flaw.