Denon AVR-X2300W Service Manual page 94

When the results of check item (29) are "the communication results are not OK"
Checking device. (HDMI Tx)
Check the power supply voltage.
Check item(30). Check of power supply voltage of
HDMI Tx :
Is the voltage at the test point of each power sup-
ply pin correct? (1.1 V)
The test points are as follows.
HDMI Tx (U1039) is faulty.
Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
NO Check item(31). Check the power supply voltage.
Check the power supply components (U1064) on
the substrate and peripheral pattern.
If there is no problem, remove the HDMI Tx
(U1039) from the substrate and measure the volt-
age at the test point of check item (30).
Is the power supply voltage correct? (1.1 V )
YES NO
The power supply circuit is faulty.
Replace the PCB.
Check item(32). Check the reset of HDMI TX :
Check the waveform .
Is the waveform at the test point TP (U1039) correct when power is
turned on?
YES
Replace (R1882) and (R1883) with new resistors
and check the I2C communication again.
Check item (32) If the result is not OK, the HDMI
Tx (U1039) is faulty. Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
94
Example of the waveform to be
checked
NO
Check the reset circuit between CPU (U1018) and
HDMI Tx (U1039).
If there is no problem, the HDMI Tx (U1039) is
faulty.
Replace with a new device.