Cleaning The Drum Unit - Brother  HL-4140CN User Manual

Cleaning the drum unit

If your printout has coloured dots at 94 mm
intervals the drum may have something stuck
to the drum surface, such as glue from a
label. Follow the steps below to solve the
problem.
a
Make sure that the machine is in the
Ready mode. Press Menu, 5, 6, then
press Mono Start or Colour Start to
print the drum dot check sheet.
56.Drum Dot Print
Printing
b
Turn off the machine. Disconnect all
cables, and then unplug the power cord
from the electrical socket.
70
c
Press the front cover release button and
A
then open the front cover.