Error Code H1-08 Failure Detection Procedure - Denon AVR-S950H Series Service Manual

3-8. Error Code H1-08 failure detection procedure

Checking device. [U1073 : CS49844A]
Check the power supply voltage.
Check item(3-8.1.). Check the power supply volt-
age. :
Does the power supply voltage of the DSP [U1073]
indicate the appropriate voltage (1.0V, 3.3V)?
The test points are as follows.
1.1V
3.3V
C2102
C2138
U1073
YES
DSP [U1073] is faulty.
Replace with a new device.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
NO Check item(3-8.2.). Check the power supply volt-
age. :
Check the power supply components [U1067,
U1068, U1078] on the substrate and peripheral
pattern.
If there is no problem, remove the DSP [U1073]
from the substrate and measure the voltage at
the test point of check item (3-8.1.).
Is the voltage correct (1.0V or 3.3V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform.
Check item(3-8.3.). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [U1073] correct (like the
one shown in the diagram) when the power is turned on?
RESET
32pin
U1073
YES NO
Check the reset circuit between CPU [U1018] and DSP [U1073].
If there is no problem, the DSP [U1073] is faulty.
Replace with a new device.
Recheck from check item (3.1.).
If it does not work, replace the PCB.
102
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
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