Denon AVR-X3500H Service Manual page 97

3-1. Error Code H1-01 failure detection procedure
Checking device. [U1001 : MN864787]
Check the power supply voltage. (HDMI Tx)
Check item(3-1.1.). Check the power supply voltage. :
Does the power supply voltage of the HDMI Tx [U1001] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
HDMI Tx
1.1V
L1084
3.3V
U1001
162 pin
YES
Check item(3-1.2.).
Check the power components [U1064/U1066] and the pattern on
the substrate.
If there is no problem, remove the HDMI Tx [U1001] from the sub-
strate and measure the voltage at the test point of
1.1.).
Is the voltage correct (1.1V or 3.3V)?
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
NO
Check the power supply voltage. :
check item (3-
YES NO
The power supply circuit is
faulty.
Replace the PCB.
check item (3.1.)
Checking the reset waveform. (HDMI Tx)
Check item(3-1.3.). Checking the reset waveform :
Check the waveform.
Is the [R1976] waveform near the HDMI Tx [U1001] correct (like
the one shown in the diagram) when the power is turned on?
HDMI Tx
U1001
R1976
YES
97
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
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.
Recheck from check item (3.1.)
If it does not work, replace the
PCB.
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