Denon AVR-S730H, Руководство по обслуживанию

Страница: 98 / 148

When the results of check item (47) are " 22 "
(Detection of DDC is OK)
Check item(50). Check the TMDS CLK detection status of the regis-
ter.
Send the following command from Termite.exe.
Send the command " i 002E 00FF 0001 ".
When the following value is returned, go to Yes.
" 88 "
When the following value is returned, go to No.
" 80 "
Check item (51). Checking the TMDS input waveform. :
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI SW[ IC701 ]
70/71/73/74/76/77/79/80pin
IC720
Checking the TMDS status register
HDMI SW [ IC701 ] is faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
Check for a short circuit in the TMDS line and the Front HDMI FFC.
If there is no problem, the Front HDMI Buffer [ IC811 ] is faulty.
Replace with a new device.
HDMI SW [ IC701 ] is faulty.
Replace with a new device.
Example
i 002E 00FF 0001
YES
YES NO
TMDS Signal
3.3V
Example of waveform in check ①
Voltage scale：1.0V/div
Time scale：20ms/div
TMDS
Example of waveform in check ②
Voltage scale：1.0V/div
Time scale：1s/div
NO
98
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating