Certain USB flash memory device cannot be used.
Do not use a USB extension cable to connect a USB flash memory device to the printer. Insert the USB flash memory device directly into the media slot.
Align the USB flash memory device in the correct direction, and then push it straight into the media slot.
When the USB flash memory device is inserted correctly, the media access lamp beside the media slot lights.
The media access lamp lights up and remains lit as long as a USB flash memory device is inserted.