Error Code H1-07 Failure Detection Procedure - Denon AVR-S730H Service Manual

3-3. Error Code H1-07 failure detection procedure

Checking device. (OSD)
Check the power supply voltage.
Check item(12). Check the power supply voltage.
:
Does the power supply voltage of the OSD[IC731]
indicate the appropriate voltage (1.8V, 3.3V)?
The test points are as follows.
6 pin
IC731
93 pin
1.8V
3.3V
YES
HDMI OSD[IC731] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
NO Check item(13). Check the power supply voltage.
:
Check the power supply components [IC742,
Q7408, IC741, Q7410] on the substrate and pe-
ripheral pattern.
If there is no problem, remove the OSD [IC731]
from the substrate and measure the voltage at
the test point of check item (12).
Is the voltage correct (1.8 V or 3.3 V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform.
Check item(14). Checking the reset :
Check the CPU.
When the power is turned on, is the TP"A_RST" waveform correct (as
shown in the figure)?
IC731
A_RST
YES NO
Check the reset circuit between CPU [IC751] and HDMI OSD[IC731].
If there is no problem, the HDMI OSD [IC731] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
83
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
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