Brother HL-1240 - Manual (Page 21)

CHAPTER 1 ABOUT THIS PRINTER
1-13
Special Paper
Before using paper with holes, such as organizer sheets, you must fan the stack well
to avoid paper jams and misfeeds.
Do not use organizer sheets that are stuck together. The glue that is used might
cause damage to the printer.
Before using any paper, make sure that it is not curled. If it is, you should straighten
the paper as much as possible. Feeding curled paper can cause paper jams and
misfeeds.
Fig. 1-5 Fan the Paper and
Straighten the Paper
Different types of paper should not be loaded at the same time in the paper cassette,
it may cause paper jams or misfeeds.