Brother MFC-J270w Basic User's Manual page 59

PHOTO CAPTURE key lights:
 PHOTO CAPTURE light is on, the memory card is properly inserted.
 PHOTO CAPTURE light is off, the memory card is not properly inserted.
PHOTO CAPTURE light is blinking, the memory card is being read or written to.

IMPORTANT
DO NOT unplug the power cord or remove the memory card from the media drive (slot) while
the machine is reading or writing to the memory card (the PHOTO CAPTURE key is blinking).
You will lose your data or damage the card.
The machine can only read one memory card at a time.
®
PhotoCapture Center : Printing photos from a memory card
9
45