Marantz AV7703 Service Manual page 124

3-7 GUI and PLD failure detection procedure
Check item(77). Does a video signal come from HDMI OUT1 to TV correctly? :
Turn Video Conversion "ON" on the setup menu.
(SETUP MENU-> Video-> Output Settings-> Video Conversion = On)
When the "SETUP" button on a remote control is pressed, is "MENU" displayed on TV which is connected
to the HDMI output terminal on the AVR?
NO
YES
When the results of check item (77) are "NO"
(When the menu display is not OK)
Check the Video signal line. (GUI -> HDMI Tx)
Check item(78). Check the format of the resistor video signal :
Send the following command from Termite.exe.
Send the command "i 0020 0070 0001".
Is the return value "22/21/20/1F/15/14/13/11/10/06/05/04/02" ?
NO
Check the Video signal line. (GUI -> PLD)
HDMI OUT1
Go to check item (78)
Go to check item (81)
Example
i 0020 0070 0001
22
YES
HDMI Tx (IC431) is faulty.
Replace with a new device.
Recheck from check item (6).
If it does not work, replace the PCB.
Check item(79). Check the PLD video signal line from the GUI :
Check the video signal waveform at the following test point.
Is the waveform like the sample?
IC401
8KOPI_DE
R4027
Check the peripheral pattern between the GUI (IC401) and PLD (IC421).
If there is no problem, the GUI (IC401) is faulty.
Replace with a new device.
Recheck from check item (6).
If it does not work, replace the PCB.
Check the Video signal line. (PLD -> HDMI Tx)
Check item(80). Check the HDMI Tx video signal line from the PLD :
Check the video signal waveform at the following test point.
Is the waveform like the sample?
DE
R4369
IC431
YES
HDMI Tx (IC431) is faulty.
Replace with a new device.
Recheck from check item (6).
If it does not work, replace the PCB.
124
3.3V
Example of waveform in check ①
3.3V
Example of waveform in check ②
NO
3.3V
Example of waveform in check ①
3.3V
Example of waveform in check ②
NO
Check the peripheral pattern between the PLD
(IC421) and HDMI Tx (IC431).
If there is no problem, the PLD (IC421) is faulty.
Replace with a new device.