Denon AVR-S730H, Руководство по обслуживанию

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When the results of check item (46) are " 00 "
(Detection of 5V is not OK.)
When the results of check item (47) are " 00 or 04 "
(If the DDC are not OK)
Check item(48). Check the +5V voltage.
Does "+5 V" at the following test point indicate 5 V?
The test points are as follows. (HDMI SW[ IC701 ]
CN710
+5V_F
Check item(49). Check the DDC line :
Does " DDCCL " and " DDCDA " signal of the HDMI SW
[ IC701 ] indicate 5 V?
The test points are as follows.
CN710
CK_F DA_F
Check the +5V voltage. (Front HDMI Buffer) Check the DDC Line. (Front HDMI Buffer)
HDMI SW [ IC701 ] is faulty.
Replace with a new device.
Recheck from check item (2).
If it does not work, replace the PCB.
Recheck from check item (2).
If it does not work, replace the PCB.
HDMI SW [ IC701 ] is faulty.
Replace with a new device.
Check for a short circuit in the 5 V line, the
Front HDMI FFC, and the 5V Switch [ IC733 ].
If there is no problem, the HDMI SW1[ IC701 ]
or 5VSwitch[ IC733 ] is faulty.
Replace with a new device.
Check for a short circuit in the DDC line and
check the Front HDMI FFC.
If there is no problem, the Front HDMI Buffer
[ IC811 ] is faulty.
Replace with a new device.
YES YES
NO
NO
less than 100KHz
5V
5V
This diagram shows an example of the DDC commu-
nication waveform.
-The high level voltage is 5V.
-The frequency of the DDC CLK is 100 KHz or less.
Check at each test point.
Voltage scale：2.0V/div
Time scale：40us/div
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