Denon AVR-X6400H - Page 128

HDMI Tx [U3401] is faulty.
Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
HDMI Tx [U3401] is faulty.
Replace with a new device.
Check for a short circuit in the TMDS line.
If there is no problem, the HDMI Tx
[U3401] is faulty.
Replace with a new device.
Check for a short circuit in the DDC line.
If there is no problem, the HDMI Tx
[U3401] is faulty.
Replace with a new device.
When the results of check item (72) are "30"
(Detection of HPD is OK / Detection of RXSENSE is OK )
Check item(73). 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(74). Checking the TMDS :
Check the TMDS waveform at the following test
point.
N3401
HDMI OUT
[MONITOR2]
D2+ D2- D1+ D1- D0+ D0- CK+ CK-
Check item(75). Check the communication :
Are the waveforms for "CKL" and "DATA" at the
test point near the HDMI output connector
[N3401] correct (as shown in the gure)?
N3401
HDMI OUT
[MONITOR2]
DDCSCK
DDCSDA
Checking the EDID register. (HDMI OUT1)
NOYES
NO
NOYES
Example
The rst eight bytes are nor-
mally "00FFFFFFFFFFFF00".
The correct resistor value can-
not be checked if the AVR and
TV are not connected by HDMI.
m_1
YES NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC communica-
tion waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100kHz or less.
Check at each test point.
Voltage scale : 2.0V/div
Time scale : 40us/div
TMDS Signal
3.3V
TMDS
Example of waveform in check ① Example of waveform in check ②
Voltage scale : 1.0V/div Voltage scale : 1.0V/div
Time scale : 20ms/div Time scale : 1s/div
128
Caution in
servicing
Electrical Mechanical Repair Information Updating