Marantz SR7013 Service Manual page 115

3-8. Error Code H1-08 failure detection procedure
Checking device. [IC251 : ADSP21487]
Check the power supply voltage. (DSP1)
Check item(3-8.1.). Check the power supply volt-
age. :
Does the power supply voltage of the DSP [IC251]
indicate the appropriate voltage (1.1V, 3.3V)?
The test points are as follows.
1.1V
3.3V
T53
CN271 4pin
IC251
YES
DSP [IC251] 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 [IC112,
Q1103, IC117] on the substrate and peripheral
pattern.
If there is no problem, remove the DSP [IC251]
from the substrate and measure the voltage at
the test point of check item (3-8.1.).
Is the voltage correct (1.1V or 3.3V)?
YES NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform. (DSP1)
Check item(3-8.3.). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [IC251] correct (like the one
shown in the diagram) when the power is turned on?
173pin
IC251
YES NO
Check the reset circuit between CPU [IC151] and DSP [IC251].
If there is no problem, the DSP [IC251] is faulty.
Replace with a new device.
Recheck from check item (3.1.)
If it does not work, replace the PCB.
115
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
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