Denon avr-s720w - Page 92

Example
The rst eight bytes are normally
"00FFFFFFFFFFFF00".
*If the AVR and the TV are not con-
nected via HDMI, the correct register
value cannot be veried.
m_1
When the results of check item (45) are "30"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(46). Check the Monitor EDID :
① Unplug the AC cord. Plug the AC cord into a power outlet.
② Send the transmission command "m_1" from Termite.exe.
Are the rst eight bytes of the returned value "00FFFFFFFFFFFF00"?
Check item(47). Checking the TMDS. :
Check the TMDS waveform at the following test
point.
HDMI OUT
CK- D0- D1- D2-
CK+ D0+ D1+ D2+
Check item(48). Check communication with the
monitor :
Are waveforms of "DDCSCK" and "DDCSDA"
observed at the test point near the HDMI output
terminal(JK751)?
HDMI OUT
DDCDATADDCCLK
Checking the EDID register (Monitor)
The HDMI Rx/Tx (IC721) is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
The HDMI Rx/Tx (IC721) is faulty.
Replace with a new device.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Rx/Tx
(IC721) is faulty.
Replace with a new device.
The HDMI Rx/Tx (IC721) is faulty.
Replace with a new device.
NOYES NOYES
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.
YES NO
92
Caution in
servicing
Electrical Mechanical Repair Information Updating