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CAUTION IN REPLACEMENT PARTS
1.
After replacing IC912.
(IC912 is EEPROM (M24C16WMN6TP) for USB DAC(IC910 TE7022LDS))
When replacing the EEPROM, the following procedure as required to write the con
fi
guration.
If you do not do the following, please note that no sound output.
- Preparation -
• USB cable (Type B-TypeA)
• Writing
data:USB_Descriptor_NA7004.txt
• Burning
software:UsbEpromUty.exe
(1)
The rear of the unit and the USB connector (B-type), PC's USB connection terminal (A-type).
Please use the USB cable on the market.
(2)
Turn on this unit. Press Input source select "DIGITAL In USB".
(3)
Paste the "USB_Descriptor_NA7004.txt" to your desktop of PC.
(4)
Run ”UsbEpromUty.exe”.
(5)
Select the
fi
le.
(6)
Click the "Program EEPROM" button.
(7) When writing of the
fi
rmware is completed, you can see the ”Program EEPROM succeeds!” messsage.
(8) If you can't complete the update, you can see ”Program EEPROM Failed!” message and please retry from (6).
Fails to write again, please do the following check.
Check USB cable connection.
Check IC910 and IC912 soldering.
REAR PANEL (B-Type)
USB(A-Type)
PC side
USB(B-Type)
NA7004 side
PC (A-Type)
(5) Select the file
(6) Implementation writing
