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3-10. Error Code H1-12 failure detection procedure
Checking device.
[U1040 :
PCM9211]
Check the power supply voltage.
Check item(36).
Check the power supply voltage.
:
Does the power supply voltage of the DIR [U1040]
indicate the appropriate voltage (3.3V)?
The test points are as follows.
U1040
C2062
3.3V
YES
DIR [U1040] is faulty.
Replace with a new device.
Recheck from
check item (1).
If it does not work, replace the PCB.
NO
Check item(37).
Check the power supply voltage.
:
Check the power supply components
[U1067,
U1078] on the substrate and peripheral pattern.
If there is no problem, remove the DIR [U1040]
from the substrate and measure the voltage at
the test point of
check item
(35).
Is the power supply voltage correct (3.3V)?
YES
NO
The power supply circuit is faulty.
Replace the PCB.
Checking the reset waveform.
Check item(38).
Checking the reset :
Check the CPU.
Is the waveform of the TP near the DIR [U1040] correct (like the one
shown in the diagram) when the power is turned on?
U1040
34 pin
YES
NO
Check the reset circuit between CPU [U1018] and DIR [U1040].
If there is no problem, the DIR [U1040] is faulty.
Replace with a new device.
Recheck from
check item (1).
If it does not work, replace the PCB.
104
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
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