Denon AVR-X3500H Service Manual page 99

3-2. Error Code H1-02 failure detection procedure
Checking device. [U1003 : MN864788]
Check the power supply voltage. (HDMI SW1)
Check item(3-2.1.). Check the power supply voltage. :
Does the power supply voltage of the HDMI Rx2 [U1003] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
HDMI Rx2
112 pin
1.1V
3.3V
U1003
38 pin
YES
Check item(3-2.2.).
Check the power components [U1065] and the pattern on the sub-
strate.
If there is no problem, remove the HDMI SW1 [U1003] from the
substrate and measure the voltage at the test point of
(3-2.1.).
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
YES NO
The power supply circuit is
faulty.
Replace the PCB.
check item (3.1.)
Checking the reset waveform. (HDMI SW1)
Check item(3-2.3.). Checking the reset waveform :
Check the waveform.
Is the "RESET" waveform of the TP near the HDMI SW1 [U1003]
correct (like the one shown in the diagram) when the power is
turned on?
HDMI Rx2
RESET
U1003
YES
99
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Check the reset circuit between
NO
CPU [U1018] and HDMI SW1
[U1003].
If there is no problem, the HDMI
SW1 [U1003] is faulty.
Replace with a new device.
Recheck from check item (3-2.3.)
If it does not work, replace the
PCB.
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