Brother MFC990CW Service Manual page 113

As listed below, the printer driver on the connected PC or the paper type setting on the machine
controls the slider cams to determine the height of the head/carriage unit.
Controlled by:
Printer driver (in printing from the PC)
Paper type setting (in copying and
printing via PhotoCapture Center*)
Adjustment for:
Thick paper and envelopes
Yes
No
*For models with PhotoCapture Center
3-36
Other types of paper
Yes
Yes
Confidential