Error Code H1-01 Failure Detection Procedure - Denon AVR-S730H Service Manual

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

Checking device. (HDMI Rx/Tx)
Check the power supply voltage. (HDMI Rx/Tx)
Check item(5). Check the power supply voltage. :
Does the power supply voltage of the HDMI Rx/Tx [IC721] indicate the correct voltage (1.1V, 3.3V)?
The test points are as follows.
112 pin
IC721
1.1V
38 pin
3.3V
YES
Check item(6).
Check the power components
tern on the substrate.
If there is no problem, remove the HDMI Rx/Tx [IC721] from the
substrate 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. :
[IC741, IC744, Q7417] and the pat-
check item
YES NO
The power supply circuit is
faulty.
Replace the PCB.
check item (1).
Checking the reset waveform. (HDMI Rx/Tx)
Check item(7). Checking the reset waveform :
Check the waveform.
When the power is turned on, is the TP[788_RST] waveform cor-
rect (as shown in the figure)?
788_RST
IC721
YES
(5).
80
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
NO
Check the reset circuit between
CPU [IC751] and HDMI Rx/Tx
[IC721].
If there is no problem, the HDMI
Rx/Tx [IC721] is faulty.
Replace with a new device.
Recheck from check item
If it does not work, replace the
PCB.
Go to next page.
(1).