Denon AVR-X3400H - Page 102

Check the power supply voltage. (HDMI SW2)
Check item(16). Check the power supply voltage. :
Does the power supply voltage of the HDMI SW2 [U1000] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
HDMI SW2
U1000
112 pin
38 pin
1.1V
3.3V
Check item(17). Check the power supply voltage. :
Check the power components [U1063/U1066] and the pattern on
the substrate.
If there is no problem, remove the HDMI SW2 [U1000] from the sub-
strate and measure the voltage at the test point of check item (16).
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
The power supply circuit is
faulty.
Replace the PCB.
Recheck from check item (1).
If it does not work, replace the PCB.
Checking device. [U1000 : MN864788]
3-3. Error Code H1-03 failure detection procedure
NOYES
NOYES
Go to next page.
YES
Checking the reset waveform. (HDMI SW2)
Check item(18). Checking the reset waveform :
Check the waveform.
Is the "RESET" waveform of the TP near the HDMI SW2 [U1000]
correct (like the one shown in the diagram) when the power is
turned on?
HDMI SW2
U1000
RESET
Check the reset circuit between
CPU [U1018] and HDMI SW2
[U1000].
If there is no problem, the HDMI
SW2 [U1000] is faulty.
Replace with a new device.
Recheck from check item (18).
If it does not work, replace the
PCB.
NO
Examples of conrmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
102
Caution in
servicing
Electrical Mechanical Repair Information Updating