Error Code H1-03 Failure Detection Procedure - Denon AVR-X2400H Service Manual

3-3. Error Code H1-03 failure detection procedure

Checking device. [U1003 : MN864788]
Check the power supply voltage. (HDMI Rx)
Check item(16). 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
U1003
38 pin
1.1V
3.3V
YES
Check item(17).
Check the power components [U1065] and the pattern on the sub-
strate.
If there is no problem, remove the HDMI Rx [U1003] from the sub-
strate and measure the voltage at the test point of
Is the voltage correct (1.1 V or 3.3 V)?
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 (1).
Checking the reset waveform. (HDMI Rx)
Check item(18). Checking the reset waveform :
Check the waveform.
Is the "RESET" waveform of the TP near the HDMI Rx [U1003]
correct (like the one shown in the diagram) when the power is
turned on?
HDMI Rx2
RESET
U1003
YES
(16).
94
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
NO
Check the reset circuit between
CPU [U1018] and HDMI Rx
[U1003].
If there is no problem, the HDMI
Rx [U1003] is faulty.
Replace with a new device.
Recheck from check item
If it does not work, replace the
PCB.
Go to next page.
(1).