Denon AVR-X6300H

When the results of check item (59) are "78 or 70"
(Detection of 5V is not OK.)
When the results of check item (60) are "00 or 04"
(Detection of DDC is not OK.)
Check item(61). Check the +5V voltage.
Does the HDMI Tx (U3401) test point indicate (5V)?
The test points are as follows.
U3401
106 pin
5V
Check item(62). Check the DDC line :
Are the "DDCCL" and "DDCDA" waveforms for the
HDMI Tx (U3401) signal correct (as shown in the
gure)?
The test points are as follows.
N3403
DDCCL
DDCDA
Check the +5V voltage. (HDMI DDC Buffer) Check the DDC Line. (HDMI DDC Buffer)
HDMI Tx (U3401) is faulty.
Replace with a new device.
Recheck from check item (5).
If it does not work, replace the PCB.
Recheck from check item (5).
If it does not work, replace the PCB.
HDMI Tx (U3401) is faulty.
Replace with a new device.
Check the 5V line for soldering faults, the
Front HDMI cable and the 5V Switch (U2400).
If there is no problem, the HDMI Tx (U3401) or
the 5 V Switch (U2400) is faulty.
Replace with a new device.
Check the DDC line for soldering faults and
the Front HDMI cable.
If there is no problem, the HDMI DDC Buffer
(U5501) is faulty.
Replace with a new device.
YESYES
NO NO
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.
118
Caution in
servicing
Electrical Mechanical Repair Information Updating