Denon AVR-X3300W Service Manual page 100

When the results of check item (38) are "the communication results are not OK"
Checking device. (HDMI Tx)
Check the power supply voltage. (HDMI Tx)
Check item(39). Check of power supply voltage of
HDMI Tx :
Does the power supply voltage of the HDMI Tx
(U1001) indicate the correct voltage (1.1V)?
The test points are as follows.
U1001
162 pin
1.1V
HDMI Tx (U1001) is faulty.
Replace with a new device.
Recheck from check item (5).
If it does not work, replace the PCB.
NO Check item(40). Check the power supply voltage.
:
Check the power components (U1064) and the
pattern on the substrate.
If there is no problem, remove the HDMI Tx
(U1001) from the substrate and measure the volt-
age at the test point of check item (39).
Is the power supply voltage correct (1.1V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Check item(41). Checking the reset waveform :
When the power is turned on, is the "RESET" waveform correct (as
shown in the figure)?
The test points are as follows.
U1001
167 pin
YES
Replace (R1974/R1975) with new resistors and
check the I2C communication again.
Check item (38) If the result is not OK, the HDMI
Tx (U1001) is faulty.
Replace with a new device.
Recheck from check item (5).
If it does not work, replace the PCB.
100
Example of the waveform to be
checked
NO
Check the reset circuit between CPU (U1018) and
HDMI Tx (U1001).
If there is no problem, the HDMI Tx (U1001) is
faulty.
Replace with a new device.