Error Code H1-10 Failure Detection Procedure - Denon AVR-X6400H Service Manual

3-10. Error Code H1-10 failure detection procedure

Checking device. [U301 : ADSP21487]
Checking the reset waveform. (DSP3)
Check item(36). Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [U301] correct (like the one
shown in the diagram) when the power is turned on?
U301
RESET
YES NO
Check the reset circuit between CPU [U6201] and DSP [U301].
If there is no problem, the DSP [U301] is faulty.
Replace with a new device.
Recheck from check item (1).
If it does not work, replace the PCB.
Check the SPI communication line. (DSP3)
Check item(37).
Check the CPU.
Is the "SPI" waveform of the TP near the DSP [U301] correct (like
the one shown in the diagram) when the power is turned on?
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
YES
DSP [U301] is faulty.
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
113
Check the SPI communication line :
CS
U301
NO
Check item(38). Check the SPI communication line :
Check DSP [U301], CPU [U6201] patterns as well as soldering.
If there is no problem, go to the next step.
check item (1).
*The diagram shows an example.
(Signal patterns vary depending on the tim-
ing.)
Points for checking waveforms
- Crest value (3.3V normally)
- Signal change
Voltage scale : 2.0V/div
Time scale : 2us/div