Check item(24).
Check the power supply voltage.
:
Does the power supply voltage of the DIR [
IC761
]
indicate the appropriate voltage (3.3V)?
The test points are as follows.
IC761
C7602
3.3V
Check item(25).
Check the power supply voltage.
:
Check the power supply components [
IC741,
Q7415
] on the substrate and peripheral pattern.
If there is no problem, remove the DIR [
IC761
]
from the substrate and measure the voltage at
the test point of
check item (24)
.
Is the power supply voltage correct (3.3 V)?
Check the power supply voltage.
Checking device. [
IC761 : PCM9211
]
Go to next page.
3-6. Error Code H1-12 failure detection procedure
NO
DIR [
IC761
] is faulty.
Replace with a new device.
Recheck from
check item (1).
If it does not work, replace the PCB.
The power supply circuit is faulty.
Replace the PCB.
NO
YES
YES
Check item(26).
Checking the reset :
Check the CPU.
When the power is turned on, is the DIR [
IC761 : 34pin
] waveform
correct (as shown in the figure)?
IC761
34 pin
Checking the reset waveform.
Recheck from
check item (1).
If it does not work, replace the PCB.
Check the reset circuit between CPU [
IC751
] and DIR [
IC761
].
If there is no problem, the DIR [
IC761
] is faulty.
Replace with a new device.
NO
YES
Examples of confirmation waveform
Voltage scale：1.0V/div
Time scale：20ms/div
88
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
Summary of Contents for AVR-S730H
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