Epson AP-60 Sound Enhancement System Product Support Bulletin page 5

6. When each button in the following screen is active, the serial communication is available.
If the serial communication is not available, the buttons in the window are grayed out
as shown below.
• Confirm that the AP-60's power light exhibits the flashing green LED again.
• Reseat the cable
• Restart PC
• Restart AP 60
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PSB.2010.01.001