My Brother DCP-J140W does print fine (took a week, but nevertheless). Installing the scanner drivers needed a lot (spread over 6 month) of trial and error, but worked in the end. I even upgraded from 12.10 to 13.10 to avoid obsolete version-problems.
After invoking either SANE (or XSANE) the scanner seems to be recognized. (In any case, if the device is switched off, SANE reports "no scanner found", when switched on, this message does not appear.) When clicking the "scan"-button, 7 circles start turning, but after a second or two, SANE reports "scan failed. Cannot start the scan." (messages in Dutch, translated here for your convenience.) The "change scanner" button shows that indeed the right make and type seem to be found.
Tried to find an answer in the similar questions, but answers that seem to apply do not make any difference when I try to follow the advise.
Is this a configuring problem, or permissions? I hope some of you out there can help, for which I thank you in advance.