Advertisement
3-9. Error Code H1-09 failure detection procedure
Checking device.
[U201 :
ADSP21487]
Check the power supply voltage. (DSP2)
Check item(3-9.1.).
Check the power supply volt-
age. :
Does the power supply voltage of the DSP [U201]
indicate the appropriate voltage (1.1V)?
The test points are as follows.
1.1V
U201
C9615
YES
DSP [U201] is faulty.
Replace with a new device.
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
NO
Check item(3-9.2.).
Check the power supply volt-
age. :
Check the power supply components [U1906] on
the substrate and peripheral pattern.
If there is no problem, remove the DSP [U201]
from the substrate and measure the voltage at
the test point of
check item
(3-9.1.).
Is the power supply voltage correct (1.1V)?
YES
NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform. (DSP2)
Check item(3-9.3.).
Checking the reset :
Check the CPU.
Is the waveform of the TP near the DSP [U201] correct (like the one
shown in the diagram) when the power is turned on?
U201
RESET
YES
NO
Check the reset circuit between CPU [U6201] and DSP [U201].
If there is no problem, the DSP [U201] is faulty.
Replace with a new device.
Recheck from
check item (3.1.)
If it does not work, replace the PCB.
112
Examples of confirmation waveform
Voltage scale : 1.0V/div
Time scale : 20ms/div
Go to next page.
Advertisement
