Error Code H1-01 Failure Detection Procedure - Denon AVR-X6400H Service Manual

3-1. Error Code H1-01 failure detection procedure

Checking device. [U3401 : MN864787]
Check the power supply voltage. (HDMI Tx)
Check item(6). Check the power supply voltage. :
Does the power supply voltage of the HDMI Tx [U3401] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
HDMI Tx
1.1V
3.3V
U3401
R3438
162 pin
YES
Check item(7).
Check the power components [U3605/U3601] and the pattern on
the substrate.
If there is no problem, remove the HDMI Tx [U3401] from the sub-
strate and measure the voltage at the test point of
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 (1).
Checking the reset waveform. (HDMI Tx)
Check item(8). Checking the reset waveform :
Check the waveform.
Is the "TP" waveform of the TP near the HDMI Tx [U3401] correct
(like the one shown in the diagram) when the power is turned
on?
HDMI Tx
U3401
RESET
YES
(6).
101
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
NO
Check the reset circuit between
CPU [U6201] and HDMI Tx
[U3401].
If there is no problem, the HDMI
Tx [U3401] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the
PCB.
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