Brother HL-1230 User Manual page 22

✏ Note
Do not load more than 250 sheets of paper (80 g/m2) in the cassette, or paper
jams may occur. Paper can be loaded up to the lines on the sliding guide.
When you print on the back of paper already printed on one side, load the side
to be printed (blank side) face down in the cassette.
5.
Install the paper cassette in the printer. Make sure it is inserted fully into the printer.
✏ Note
Extend the output tray extension flap to prevent printouts from sliding off the
face down output tray.
1
If you choose not to extend the output tray extension flap, we recommend that
you remove printed pages immediately after they exit the printer.
6.
Send the print data to the printer.
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CHAPTER 1 ABOUT THIS PRINTER