Samsung ML 7300N - Manual (Page 101)

M
AINTAINING
Y
OUR
P
RINTER
6.6
Cleaning LSU
3 Slide the LSU cleaner
horizontally across a track on
the top of the LSU.
To obtain high quality from your printer, clean the LSU(Laser Scanning Unit)
when characters have lines running through them.
1 Open the top cover and remove the toner cartridge.
2 Pull up on the LSU cleaner and put it on the LSU.
Notes: For more information on using method, see
attached label on the inside of the top cover.