Marantz AV7703 Service Manual page 104

When the results of check item (19) are "30 or 20 or 10 or
(Detection of HPD is not OK / Detection of RXSENSE is not OK )
Check the TMDS/HPD. (HDMI ZONE2 OUT)
Check item(25). Checking the HPD and RXSENSE. :
Does the test point near HDMI output terminal (JK394) indicate
(3.3V)?
Does the test point (HPD) near HDMI output terminal (JK394) indi-
cate "Hi(3-5V)"?
JK394 ZONE2
HPD
YES NO
Check for a short circuit in the TMDS/ HPD line.
If there is no problem, the HDMI Switcher1 (IC391) is faulty.
Replace with a new device.
HDMI Switcher1 (IC391) is faulty.
Replace with a new device.
Recheck from check item (3).
If it does not work, replace the PCB.
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