Denon AVR-X2300W Service Manual page 88

When the results of check item (13) are "00"
(Detection of 5V is not OK)
Check the +5V voltage. (HDMI Rx)
Check item(15). Check the +5V voltage :
Does "+5 V" at the following test point indicate 5 V?
YES
HDMI Rx (U1000 or U1003) is faulty.
Replace with a new device.
Recheck from check item (3).
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 Rx (U1000 or
U1003) or the 5 V Switch IC (U1002) is faulty
Replace with a new device.
When the results of check item (14) are "00 or
(Detection of DDC is not OK.)
Check the DDC line. (HDMI Rx)
Check item(16). Check the DDC line :
Are waveforms of "DDCSCK" and "DDCSDA" observed at the test point near the HDMI input terminal?
YES
HDMI Rx (U1000 or U1003) is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
88
04"
less than 100KHz
5V
5V
This diagram shows an example of the DDC communication
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 Rx1 (U1000) or
HDMI Rx2 (U1003) is faulty.
Replace with a new device.