Denon AVR-X3300W Service Manual page 94

3-3 Switcher2 failure detection procedure
Checking device. (HDMI Switcher2)
Check communication between CPU and the HDMI Switcher2 device.
Check item (26). Check communication between CPU and the HDMI
Switcher2 device. :
Check by reading device ID and revision of each device.
Check communication between HDMI Switcher2 (U1000) and CPU
(U1018) .
Send the following command from Termite.exe.
Send the command "i 0050 0000 0001".
Is the return value "01" ?
If the communication results are not OK
If the communication results are OK
When the results of check item (26) are "the communication results are not OK"
Checking device. (HDMI Switcher2)
Example :
Check the power supply voltage. (HDMI Switcher2)
Check item(27).
:
i 0050 0000 0001
Does the power supply voltage of the HDMI
01
Switcher2 (U1000) indicate the correct voltage
(1.1V, 3.3V)?
If it is normal, "01" is returned.
The test points are as follows.
Go to check item (27)
Go to check item (30)
94
Check the power supply voltage.
NO
Check item(28).
:
Check the power components (U1063) and the
pattern on the substrate.
If there is no problem, remove the HDMI Switch-
er2 (U1000) from the substrate and measure the
112 pin voltage at the test point of
Is the voltage correct (1.1 V)?
1.1V
U1000
YES
HDMI Switcher2 (U1000) device is
failure.
Replace with a new device.
Recheck from check item (4).
If it does not work, replace the PCB.
Go to next page.
Check the power supply voltage.
check item (27).
YES NO
The power supply circuit is faulty.
Replace the PCB.