Denon AVR-X3300W Service Manual page 97

When the results of check item (30) are "NO"
(Detection of 5V is not OK)
Check the +5V voltage. (HDMI IN1 - 4)
Check item(32). Check the +5V voltage.
Does the test point near HDMI output connectors (N1001/N1002/N1003/N1004) indicate 5V?
IN4 IN3
5V 5V
IN2 IN1
5V
5V
YES
HDMI Switcher2 (U1000) is faulty.
Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
NO
Check for a short circuit in the 5 V line and the 5
V Switch IC (U1002).
If there is no problem, the HDMI Switcher2
(U1000) or the 5V Switch IC (U1002) is faulty
Replace with a new device.
When the results of check item (31) are "00 or
(Detection of DDC is not OK.)
Check the DDC line. (HDMI IN1 - 4)
Check item(33). Check the DDC line :
Are waveforms of "DDCSCK" and "DDCSDA" observed at the test point near the HDMI input
terminal(N1001/N1002/N1003/N1004)?
IN4 IN3
DDCSCK
DDCSDA
IN2 IN1
YES
HDMI Switcher2 (U1000) is faulty.
Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
97
04"
less than 100KHz
5V
5V
This diagram shows an example of the DDC commu-
nication waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
NO
Check for a short circuit in the DDC line.
If there is no problem, the HDMI Switcher2
(U1000) is faulty.
Replace with a new device.