Marantz SR5012 Service Manual page 109

3-9. Error Code H1-08 failure detection procedure
Checking device. [U1073 : CS49844A]
Check the power supply voltage.
Check item(31). Check the power supply voltage.
:
Does the power supply voltage of the DSP [U1073]
indicate the appropriate voltage (1.0V, 3.3V)?
The test points are as follows.
1.0V
3.3V
C2138
U1073
C2102
YES
DSP [U1073] 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 [U1067,
U1068, Q1067] 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 (31).
Is the voltage correct (1.0 V or 3.3V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform.
Check item(33). 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?
U1073
32 pin
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 (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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