Denon DRA-800H Service Manual page 89

When the results of check item (3-7.2.) are "22"
(Detection of DDC is OK.)
Checking the TMDS status register
Check item(3-7.5.). Checking register of the TMDS CLK detection status
register :
Send the following command from Termite.exe.
HDMI Rx/Tx
Send the command "i 0006 00FF 0001".
When the following value is returned, go to Yes.
HDMI IN4 "22" HDMI IN5 "11"
When the following value is returned, go to No.
HDMI IN4 "20" HDMI IN5 "10"
YES
Check item(3-7.7.). Checking the audio signal output :
Check the audio signal waveform at the following test point.
Is the waveform like the sample?
IC721
129/131/132/133/134/135/136pin
YES
The digital audio block is faulty.
Check the digital audio device.
Check "AUDIO" in troubleshooting.
If it does not work, replace the PCB.
Example
i 0006 00FF 0001
NO
3.3V
The diagram shows an example of the wave-
form of pin 129. (I2S0 Data)
Waveform check points
- Crest value (3.3V normally)
- Signal change
Check the waveform of each pin.
Voltage scale：1.0V/div
Time scale：20ms/div
NO
HDMI Rx/Tx [IC721] is faulty.
Replace with a new device.
3.3V
Example of waveform in check ① Example of waveform in check ②
Voltage scale：1.0V/div
Time scale：20ms/div
Check item(3-7.6.). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI IN4
80/81/83/84/86/87/89/90pin
HDMI IN5
93/94/96/97/99/100/102/103pin
IC721
YES
HDMI Rx/Tx [IC721] is faulty.
Replace with a new device.
Recheck from check item (3.2.).
If it does not work, replace the PCB.
89
TMDS Signal TMDS
Voltage scale：1.0V/div
Time scale：1s/div
NO
Check for a short circuit in the pattern of the
TMDS line of the HDMI Rx/Tx [IC721] from the
HDMI input terminal.
If there is no problem, the HDMI Rx/Tx [IC721] is
faulty.
Replace with a new device.