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3-11. Error Code H1-11 failure detection procedure
Checking device.
[U401 :
ADSP21487]
Checking the reset waveform. (DSP4)
Check item(3-11.1.).
Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [U401] correct (like the one
shown in the diagram) when the power is turned on?
U401
RESET
YES
NO
Check the reset circuit between CPU [U6201] and DSP [U401].
If there is no problem, the DSP [U401] is faulty.
Replace with a new device.
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
Check the SPI communication line. (DSP4)
Check item(3-11.2.).
Check the CPU.
Is the "SPI" waveform of the TP near the DSP [U401] 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 [U401] is faulty.
Replace with a new device.
Recheck from
If it does not work, replace the PCB.
115
Check the SPI communication line :
CS
U401
NO
Check item(3-11.3.).
Check the SPI communication line :
Check DSP [U401], CPU [U6201] patterns as well as soldering.
If there is no problem, go to the next step.
check item (3.1.)
*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
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