Denon AVR-X3300W Service Manual page 105

3-5 Front HDMI Buffer (AD8195) failure detection procedure
Checking operation between the HDMI (Front HDMI Buffer) and the player
b In order to check, connect the player to the HDMI terminal and configure the player as AVR source.
Check the sound output while turning on the player.
Check the power supply voltage. (Front HDMI Buffer)
Check item(51). Check the power supply voltage. :
Does the power supply voltage of the Front HDMI FFC base (N1000) indicate the correct voltage (5V)?
The test points are as follows.
7pin
YES
Check item(52). Check the power supply voltage. :
Check the FFT SW (Q1058) and peripheral pattern.
If there is no problem, remove the Front HDMI FFC from the substrate and measure the voltage
at the test point of check item (51).
Is the power supply voltage correct (5 V)?
YES
Front HDMI Buffer (U1022) is faulty.
Replace with a new device.
Recheck from check item (5).
If it does not work, replace the PCB.
5V
NO
NO
Replace the FET SW (Q1058) and recheck from
check item (51).
If it does not work, replace the PCB.
Checking the +5V/DDC status register (Front HDMI Buffer)
Check item(53). Checking the 5V status register :
Send the following command from Termite.exe.
Send the command "i 0006 00FF 0001".
Check the value.
Move to the branch destination according to the value returned.
"78 or 70"
(Detection of 5V is not OK.)
"F8 or F0"
(Detection of 5V is OK)
Check item(54). Checking the status register :
Send the following command from Termite.exe.
Send the command "i 0003 00B4 0001".
Check the value.
Move to the branch destination according to the value returned.
"00 or 04"
(Detection of DDC is not OK.)
"22"
(Detection of DDC is OK)
105
Example
i 0006 00FF 0001
F8
Go to check item (55)
Example
i 0003 00B4 0001
22
Go to check item (56)
Go to check item (57)