Denon AVR-X3400H - Page 110

Check item(35). Check the power supply voltage.
:
Does the power supply voltage of the DIR [U1040]
indicate the appropriate voltage (3.3V)?
The test points are as follows.
U1040 C2062
Check item(36). Check the power supply voltage.
:
Check the power supply components [U1067,
Q1067] 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 (35).
Is the power supply voltage correct (3.3V)?
Check the power supply voltage.
Checking device. [U1040 : PCM9211]
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3-9. Error Code H1-12 failure detection procedure
NO
DIR [U1040] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
The power supply circuit is faulty.
Replace the PCB.
NOYES
YES
Check item(37). 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?
U1040
34 pin
Checking the reset waveform.
Recheck from check item (1).
If it does not work, replace the PCB.
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.
NOYES
Examples of conrmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
110
Caution in
servicing
Electrical Mechanical Repair Information Updating