Marantz SR5012 Service Manual page 118

When the results of check item (51) are "22"
(Detection of DDC is OK)
Checking the TMDS status register
Check item(54). 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"
YES
HDMI Rx1 [U1000] is faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
Check item(55).
Example
Check the TMDS waveform at the following test point.
Is the waveform like the sample?
HDMI Rx1 [U1000]
i 002E 00FF 0001
NO
HDMI Rx1 [U1000] is faulty.
Replace with a new device.
118
Checking the TMDS input waveform. :
U1000
42/43/45/46/48/49/51/52 pin
YES
Check for a short circuit in the TMDS line and the Front HDMI FFC.
If there is no problem, the Front HDMI Buffer [U3000] is faulty.
Replace with a new device.
3.3V
TMDS Signal
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