Cleaning The Scanner Window - Brother HL-1850 Service Manual

4) Clean the primary corona wire inside the drum unit by gently sliding the blue tab from
right to left several times. Return the tab to the home position before re-install the drum
unit assembly.
Home position

!
CAUTION:
Make sure that the blue tab on the drum unit is returned to the home position (
before re-installing the drum unit into the printer, or printed pages may have vertical stripes.
5) Re-install the drum unit into the printer.
6) Close the front cover.
3.3

Cleaning the Scanner Window

When replacing the drum unit or toner cartridge with a new one, be sure to clean the scanner
window.
1) Turn off the power switch and unplug the power cord.
2) Press the cover release button, and then open the front cover.
3) Pull the drum unit assembly out of the printer.
!
CAUTION:
It is recommended to place the drum unit assembly on a piece of disposable paper or cloth in
case you accidentally spill or scatter toner.
4) Gently wipe the scanner window (colored magenta in the figures below) with a soft dry
cloth.
Fig. 5-10
Fig. 5-11
5-7
HL-1850/1870N SERVICE MANUAL
mark position)