Brother HL-4200CN Service Manual page 361

How to clean the print head cartridge
Attach this cleaning kit to the printer so the brush directly brushes the dirty parts
of the print head cartridge. Follow the following procedures.
Lining up the brush with the dirty part of the print head cartridge
1
Remove the dust and dirt from the
brush part of the cleaning kit with the
brush cleaner provided.
2
Place the print sample (single sided
print samples) on which colored dots
were printed face up on a desk.
If you don't have a sample, print out the printer settings
list. Refer to the last page of the " Printing the printer
settings list".
3
Put the cleaning kit on the print sample,
matching the center of the cleaning kit
to the center of the print sample.
4
While lightly holding the cleaning kit
with one hand, move the orange knob,
and then align the brush with the
colored dot.
Attaching the cleaning kit to clean the print head cartridge
1
Turn on the printer.
2
Orange knob
Center of the
paper
Paper orientation
Colored dots
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