Brother MFC Series Service Manual page 283

Selector 1: Prevention of stains on back side of leading edge of paper in

borderless printing
Setting this selector to "1" reduces the protruding amount of the leading edge of
recording paper to the platen groove to minimize stains that could be caused by ink
mist on the back side of the leading edge. Enabling this function increases the
throughput rather than disabling it.
Selectors 3 and 4: Protection of platen from no-paper printing to prevent stains

The setting made by these selectors applies to such printing that is assumed to be at a
high resolution, that is, printing from a PC or memory card, copying, and printing via
PictBridge.
If these selectors are set to "0, 0", the machine automatically determines the functions
of the paper width sensor depending upon the print resolution selected. Therefore, in
low resolution printing, e.g. when the "Fast" print quality is selected, the paper width
sensor is automatically disabled. On the contrary, in high resolution printing, e.g. when
the "Highest" print quality is selected, the sensor is automatically enabled.
Setting these selectors to "1, 1" disables the paper width sensor.
Selectors 5 and 6:

Enabling assurance print 1 causes the machine to mix black ink (pigment-based) and
a little of cyan ink (dye-based) to use in "monochrome copy."
Enabling assurance print 2 causes the machine to mix black ink (pigment-based) and
a little of cyan ink (dye-based) to use in "monochrome FAX reception" and "list output".
If black ink is not jetted out normally, cyan ink can be substituted for black ink in
printing. This ensures that in list printing (in which data once printed will be deleted) the
data will be preserved as a printout.
Selectors 7 and 8: Workaround for false jam detection (Functional restriction on

The setting made by these selectors applies to the FAX, list, index printing and test
printing.
When logo printed recording paper is used, for example, the paper width sensor might
misdetect the paper present state as "no paper loaded" due to the logo's color. Limiting
the paper width sensor functions with these selectors avoids detecting such a false
paper jam.
(Functional restriction on the paper width sensor)
Assurance print 1 and 2
the paper width sensor)
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