Denon AVR-4520CI Service Manual

106
I2C communication wave form (sample)
CLK
DATA
AUDIO/VIDEO UNIT aw.
B
NO
NO
YES
YES
Extend DIGITAL UNIT using a jig.
Power supply IC (U3701 or U3702) aw.
Defective connection of N4004 or N4007.
Video selector IC (U3703) aw.
Input terminal (K3503) or the parts of
between video selector IC (U3703) aw.
Defective connection of N4004 or N4007
or the parts of between video selector IC
(U3703) aw.
DIGITAL UNIT aw.
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) aw.
YES
Output terminal (K3503 or K3504 or K3502) aw.
Defective connection of TV Monitor or TV Monitor aw.

Denon AVR-4520CI Specifications

General

Brand	Denon
Model	AVR-4520CI
Category	Receiver
Language	English