Denon AVR-X3500H Service Manual page 109

3-9. Error Code H1-12 failure detection procedure
Checking device. [U1040 : PCM9211]
Check the power supply voltage.
Check item(3-9.1.). Check the power supply volt-
age. :
Does the power supply voltage of the DIR [U1040]
indicate the appropriate voltage (3.3V)?
The test points are as follows.
U1040 C2062
YES
DIR [U1040] is faulty.
Replace with a new device.
Recheck from check item (3.1.)
If it does not work, replace the PCB.
NO Check item(3-9.2.). Check the power supply volt-
age. :
Check the power supply components [U1067,
Q1080] on the substrate and peripheral pattern.
If there is no problem, remove the DIR [U1040]
from the substrate and measure the voltage at
the test point of check item (3-9.1.).
Is the power supply voltage correct (3.3V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform.
Check item(3-9.3.). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DIR [U1040] correct (like the one
shown in the diagram) when the power is turned on?
34 pin
U1040
YES NO
Check the reset circuit between CPU [U1018] and DIR [U1040].
If there is no problem, the DIR [U1040] is faulty.
Replace with a new device.
Recheck from check item (3.1.)
If it does not work, replace the PCB.
109
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
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