Error Code H1-09 Failure Detection Procedure - Denon AVR-X6400H Service Manual

3-9. Error Code H1-09 failure detection procedure

Checking device. [U201 : ADSP21487]
Check the power supply voltage. (DSP2)
Check item(31). Check the power supply voltage.
:
Does the power supply voltage of the DSP [U201]
indicate the appropriate voltage (1.1V)?
The test points are as follows.
1.1V
U201
C9615
YES
DSP [U201] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
NO Check item(32). Check the power supply voltage.
:
Check the power supply components [U1906] on
the substrate and peripheral pattern.
If there is no problem, remove the DSP [U201]
from the substrate and measure the voltage at
the test point of check item (31).
Is the power supply voltage correct (1.1V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform. (DSP2)
Check item(33). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [U201] correct (like the one
shown in the diagram) when the power is turned on?
U201
RESET
YES NO
Check the reset circuit between CPU [U6201] and DSP [U201].
If there is no problem, the DSP [U201] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
111
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
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