<!-- from fixya rte -->How to do Unable to Init.AF? - Brother DCP-J315W Inkjet Multifunction Printer - Colour - Photo Print

SOURCE: init unable AF

AF means that the CIS scanner is (can) not (get)in right position. This could be because of a broken scanner flat cable, or a loose flatcable or a defective pcb. Check flatcable connection at the pcb (Open scanner like changing carts, open flatcable cover with a screwdriver. Does the flatcable stick in the pcb? (There is only the flatcable without a connector ;-)) Reconnect and power up mfc again. If it doesn't help please write again here.

SOURCE: MFC-240C

You have to reconnect the scannerflatcable to the main circuit board.

Open the scanner top as when a paperjam had occured. Remove the "Z" lookinglike plastic cover near the middle running to the right side which hides the flatcable. Simply stick the flatcable into the mainboard, close the cover 
again and close the scanner top.

SOURCE: Unable to Init AF - New printer!

sure (this advice costs you some greetings from me to the beloved bahamas ;-))

you have to open the scanner as you have done to connect the usb cable. When opened you can see a "z" like small cover going from panel to the right rear side.
Open this cover which hides the flat cable of the scanner. The cable needs reconnecting to the main board. Simply stick it carefully into the right positon.

(will post a picture later)

SOURCE: Brother DCP-135C - "Init unable AF"

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SOURCE: It says unable to init.

Error AF means that the scanner unit is malfunctioning. This is a hardware fault and cannot be solved by an end user. The scanner unit have to be replaced.