Brother HL 1240 - B/W Laser Printer Service Manual page 108

CHAPTER 5 PERIODIC MAINTENANCE
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) Remove the drum unit from the printer.
3) Gently wipe the scanner window (colored magenta in the figures below) with a soft dry
cloth.
!
CAUTION:


Do not touch the scanner window with your fingers.


Do not wipe the scanner window with cleaning alcohol (isopropyl).
3.4 Clean the Electrical Terminals
When replacing the drum unit or toner cartridge with a new one, be sure to clean the electrical
terminals inside the printer body.
1) Turn off the power switch and unplug the power cord.
2) Remove the drum unit from the printer.
3) Wipe the electrical terminals as shown in the figure below with a soft dry cloth.
Fig. 5-8
Fig. 5-9
5-6