Checking device. [
U401 : ADSP21487
]
3-11. Error Code H1-11 failure detection procedure
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
Checking the reset waveform. (DSP4)
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
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.
NO
YES
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Check item(3-11.2.).
Check the SPI communication line :
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?
U401
CS
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 the SPI communication line. (DSP4)
DSP [
U401
] is faulty.
Replace with a new device.
*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
NO
YES
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
115
