I2C Communication Waveforms - Denon AVR-3311CI Service Manual

D
Input
COMPONENT
Check of power supply voltage
V+5V : N2004-4pin
V-5V : N2004-1pin
Check on set value of each IC.
HDMI B'D
L4900 : Check I 2 C communication
waveforms.
L4901 : Check I C communication
2
waveforms.
Extend HDMI B'D using a jig.
Check output of selector (U2003).
COMPONENT-Y : JV1
COMPONENT-Cb : JV128
COMPONENT-Cr : JV31
Check FRONT CONNECTOR B'D
flaw, and connection of FRONT
CONNECTOR B'D or HDMI B'D and
VIDEO B'D.

I2C communication waveforms

CH1：CLK
CH1：DATA
NG
REGULATOR B'D flaw
OK
NG
HDMI B'D flaw
OK
Check input of selector (U2003).
NG
COMPONENT-Cb : JV79
COMPONENT-Cr : JV175
Check power supply voltage of
OK
U2003, and surrounding circuitry
soldering.
COMPONENT-Y : JV80
OK
b Unless specified, VIDEO B'd part.
67
NG
Check cable between main unit
and monitor or check monitor.