A:AnswerThis is a monochromatic (i.e. black and white) printer. It uses a single print cartridge. There are two official Brother ink cartridges to chose from: the TN420 and the TN450. Both of these cartridges will work, but one will print an estimated 1,200 pages (the TN420) and the other will print 2,600 (the TN450).
A:AnswerDefault is off but it is very easy to program it for on. Just follow the instruction on how to in the owners guide. It's on page 25 of " Sending a Fax ".
A:AnswerI understand you are having an issue with a busy signal on your FAX2840. Here is a FAQ that may help. https://help.brother-usa.com/app/answers/detail/a_id/64814?R3ModelID=FAX2840